| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455234200 |
Processor controlled
| 17 |
| 455253200 |
Plural amplifier stages
| 13 |
| 455245100 |
Automatic gain control signal derived from information signal
| 12 |
| 455249100 |
Variable attenuator type
| 9 |
| 455248100 |
Constant or controlled input impedance
| 8 |
| 455246100 |
Responsive to plural inputs | 5 |
| 20100136939 | GAIN CONTROL APPARATUS AND METHOD IN RECEIVER OF MULTIBAND OFDM SYSTEM - A gain control apparatus in a receiver of multiband OFDM system includes: an amplifier amplifying a received signal based on a first auto gain control signal; an analog-to-digital converter for converting the amplified signal into a digital signal; band reception signal extractor for extracting a signal of a desired reception band from the converted digital signal for each reception band, and controlling gain of the extracted signal according to a second auto gain control signal; a reception power detector for detecting a reception power value of whole band from the converted digital signal; and a multiband integration baseband processor for generating the first auto gain control signal by using the detected reception power value of the whole band, and generating the second auto gain control signal to be provided to the band reception signal extraction units, resource allocation information for each band and a reception power for each reception band. | 06-03-2010 |
| 20090036079 | IQ Imbalance Image Suppression in Presence of Unknown Phase Shift - A wireless communication system receiver compensates a received signal containing an IQ gain imbalance prior to performing frequency correction. The IQ gain imbalance in the signal is estimated after frequency correction, providing an IQ gain imbalance estimate for subsequent IQ gain imbalance compensation. The IQ gain imbalance estimation includes formulating a plurality of hypotheses of phase error between I and Q signal components, and taking as the actual phase error the hypothesis that yields the maximum power ratio between I and Q signal components. The maximum power ratio is differentiated with respect to the IQ imbalance estimate. The IQ gain imbalance estimate is updated as a function of its prior value(s), the maximum power ratio, and the derivative of the maximum power ratio. | 02-05-2009 |
| 20120034894 | AUTOMATIC GAIN CONTROL SYSTEM WITH DUAL-RSSI INTERFERENCE DETECTION FOR OPTIMIZATION OF SENSITIVITY AND ADJACENT CHANNEL REJECTION PERFORMANCE OF RF RECEIVERS - A tuner includes a low noise amplifier (LNA), a first received signal strength indicator (RSSI), a mixer, an intermediate frequency (IF) filter, a second RSSI and an adjustment unit. The LNA amplifies a radio frequency (RF) signal. The first RSSI detects received signal strength indication of the RF signal and obtains a first signal strength voltage. The mixer is coupled to the LNA and down-converts the RF signal into a first IF signal according to a local oscillation frequency. The IF filter is coupled to the mixer and filters the first IF signal to obtain a second IF signal. The second RSSI detects received signal strength indication of the second IF signal and obtains a second signal strength voltage. The adjustment unit adjusts a gain of the LNA according to the first signal strength voltage and the second signal strength voltage. | 02-09-2012 |
| 20130281040 | RECONFIGURABLE POWER AMPLIFIER FOR IMPROVED LOW-POWER EFFICIENCY - A radio frequency (RF) power amplifier (PA) is reconfigured to operate in a low power mode from a high power mode. The RF PA has a first RF amplifier is connected to the first and second inputs of a first transformation network. The RF PA has a second a second RF amplifier connected to a second transformation network. During high power mode, both RF amplifiers drive a load coupled to the transformation networks. In low power mode the first RF amplifier is disabled and the first and second inputs of the first transformation are coupled together so as to change the load impedance seen by the second RF amplifier. The second RF amplifier continues to supply power to the load during operation in the low power mode. | 10-24-2013 |
| 20140155012 | Method and Apparatus for Efficient DC Calibration in a Direct-Conversion System with Variable DC Gain - A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated. | 06-05-2014 |
| 455239100 |
Nonlinear automatic gain control | 4 |
| 20090075614 | AUTOMATIC GAIN CONTROL METHOD FOR RECEIVER AND APPARATUS THEREOF - A gain control method which includes setting a first initial gain value to a first variable gain amplifier; measuring a first power value corresponding to incoming signals; measuring a second power value corresponding to a target signal; and resetting the first initial gain value according to the first power value and the second power value. Another gain control method is also disclosed, which includes updating a gain value of a first variable gain amplifier by combining an adjustment value with the gain value according to a first tuning direction; obtaining a signal quality indicator; comparing the signal quality indicator with a reference signal quality indicator to generate a comparison result; and referring to the comparison result, further updating the gain value according to the first tuning direction or a second tuning direction opposite to the first tuning direction. | 03-19-2009 |
| 20090247106 | Method and System for Detecting An Out Of Band Interferer in An RF Receiver - A system and method is provided for reducing signal distortion and saturation within an RF receiver which may be operated in an environment under the presence of interfering signals such as in a WiMAX environment. In an embodiment, a first gain stage and a second gain stage are selectively lowered to predetermined lower levels, assuring that if there is a blocker present, it would not cause signal distortion and saturation in the receiver. The loss of the gain in the first gain stage and second gain stage is compensated by a third gain stage which selectively amplifies the signals of interest. If a blocker is not detected, the maximum allowable gain of the first gain stage and the second gain stage is set to a predetermined upper limit allowing for maximum receiver sensitivity. Accordingly, with this system and method a direct conversional receiver can operate in the presence of interfering signals without signal distortion and saturation. | 10-01-2009 |
| 20100216418 | AMPLIFIER ASSEMBLY, RECEIVER COMPRISING SAID ASSEMBLY AND METHOD FOR OPERATING A PROGRAMMABLE AMPLIFIER - An amplifier assembly and also a receiver including such an amplifier assembly is disclosed, wherein the amplifier includes a programming input for setting the gain thereof. The signal level at the output of the amplifier is compared with a reference level and a counter is incremented in a step-by-step fashion such that the gain in the amplifier is reduced for as long as the output level lies above the reference level. The amplifier assembly enables frequency-dependent received field strength fluctuations that occur in frequency hopping methods to be corrected in a manner dependent on the conditions in the current time slot. The assembly is also suitable for modulation methods that use a modulation with phase and amplitude variation. | 08-26-2010 |
| 20150094007 | Receiver Chip with Multiple Independent Loop-Through Paths - A radio receiver and method of operating the same are disclosed. In one embodiment, the radio receiver may include a RF receive path configured to convey a first radio signal within a first band to a radio tuning circuit. The RF receive path may be controllable using a first AGC circuit. The radio receiver may also include a loop-through path configured to convey a second radio signal within a second band between an input and an output of the radio receiver. The second band may be different from the first band. The loop-through path may be controllable using a second AGC circuit. | 04-02-2015 |
| 455251100 |
Plural stages with different levels or bias to each stage (e.g., partial automatic gain control) | 3 |
| 20090004987 | RADIO FREQUENCY RECEIVING APPARATUS, RADIO FREQUENCY RECEIVING METHOD, LSI FOR RADIO FREQUENCY SIGNAL AND LSI FOR BASE BAND SIGNAL - A receiving apparatus may achieve optimal RF and IF gain control while suppressing saturated amplification due to interference. The receiving apparatus includes an RF variable gain Amp that amplifies a received RF signal, a mixer that converts an output signal of the RF variable gain Amp into an IF signal, an IF variable gain Amp that amplifies the IF signal, a demodulator that demodulates an output signal of the IF variable gain Amp, and an AGC circuit. The AGC circuit sets a period of gain control for the RF variable gain Amp to be shorter than a period of gain control for the IF variable gain Amp when gains of the RF variable gain Amp and the IF variable gain Amp are controlled based on the output signal of the IF variable gain Amp. | 01-01-2009 |
| 20120244826 | Method and Apparatus for Efficient DC Calibration in a Direct-Conversion System with Variable DC Gain - A wireless communication receiver includes a multitude of look-up tables each storing a multitude of DC offset values associated with the gains of an amplification stage disposed in the wireless communication receiver. The entries for each look-up table are estimated during a stage of the calibration phase. During such a calibration stage, for each selected gain of an amplification stage, a search logic estimates a current DC offset number and compares it to a previous DC offset estimate that is fed back to the search logic. If the difference between the current and previous estimates is less than a predefined threshold value, the current estimate is treated as being associated with the DC offset of the selected gain of the amplification stage and is stored in the look-up table. This process is repeated for each selected gain of each amplification stage of interest until the look-up tables are populated. | 09-27-2012 |
| 20150111513 | METHOD OF CONTROLLING RECEIVER GAIN AUTOMATICALLY AND APPARATUS FOR AUTOMATIC GAIN CONTROL IN RECEIVER - A method of controlling an automatic gain in a receiver includes receiving an input signal through an antenna of the receiver, by an automatic gain control unit of the receiver, setting a final RF gain, and by the automatic gain control unit, setting an IF gain in a state that the final RF gain is set. | 04-23-2015 |
| 455252100 |
Semiconductor | 3 |
| 20120225631 | ATTENUATOR AND METHOD FOR ATTENUATING - A semiconductor device ( | 09-06-2012 |
| 20130137388 | SEMICONDUCTOR INTEGRATED CIRCUIT AND RADIO RECEIVER - The first control circuit controls the gain of the variable gain amplifier circuit and the cut-off frequency of the first low-pass filter so as to keep constant a product of a transfer function of the variable gain amplifier circuit and a transfer function of the first low-pass filter. The second control circuit compares a level of the second feedback signal and a preset threshold value after completion of gain control of the variable gain amplifier circuit, the second control circuit inputting the signal outputted from the first low-pass filter, as the first feedback signal to the first terminal as long as the level of the second feedback signal is not lower than the threshold value, the second control circuit inputting the signal outputted from the second low-pass filter, as the first feedback signal to the first terminal. | 05-30-2013 |
| 20150111514 | HIGH PERFORMANCE, LOW COST RECEIVER FRONT END - A radio frequency (RF) receiver front end includes an RF attenuator for receiving an RF input signal and a low noise amplifier (LNA). In one form, the LNA provides a differential output signal and includes a first polarity amplifier and a plurality of second polarity amplifiers. The first polarity amplifier has an input terminal coupled to the output of the RF attenuator, an output terminal for providing a first component of the differential RF output signal, and has a first input impedance. Each of the plurality of second polarity amplifiers has an input terminal coupled to the output of said RF attenuator, and an output terminal. The output terminals of said plurality of second polarity amplifiers are coupled together and form a second component of the differential RF output signal. Each of the plurality of second polarity amplifiers has a second input impedance higher than the first input impedance. | 04-23-2015 |
| 455250100 |
Automatic gain control to improve strong signal handling | 1 |
| 20080293370 | Receiver Gain Control - A gain controller for controlling the gain of at least one amplifier in a receiver, the gain controller being arranged to, when the receiver is receiving a signal: for a first period of time, repeatedly determine an indication of the strength of the received signal and adjust the gain of the at least one amplifier in dependence on each indication of signal strength and following the expiry of the first period of time: determine a subsequent indication of the strength of the received signal and make a single adjustment of the gain of the at least one amplifier in dependence on the subsequent indication of signal strength. | 11-27-2008 |
| 455237100 |
Responsive to locally injected pilot | 1 |
| 20090247105 | METHOD AND CIRCUIT FOR ADAPTIVE AUTOMATIC GAIN CONTROL - A method for adaptive automatic gain control and an automatic gain control circuit are provided. A predetermined waveform is injected into the automatic gain control circuit. A signal is sampled at at least one point in the automatic gain control circuit in which the sampled signal includes the injected predetermined waveform. A small-signal control characteristic is calculated using the sampled at least one signal. A determination is made as to whether the calculated small-signal control characteristic is valid. In the case of a valid determination, the calculated small-signal control characteristic is used to adjust the gain of the automatic gain control circuit. | 10-01-2009 |
| Entries |
| Document | Title | Date |
|---|
| 20080200140 | BASE STATION RECEIVING CIRCUIT - The present invention includes: gain controlling and amplifying means for amplifying a signal received from a mobile station and for outputting the amplified received signal; reception quality measuring means for measuring reception quality of the received signal output from the gain controlling and amplifying means; scheduling means for performing scheduling to allocate a radio resource to the mobile station on the basis of a measurement result at the reception quality measuring means; gain controlling means for controlling a gain of the gain controlling and amplifying means on the basis of the received signal output from the gain controlling and amplifying means to keep an amplitude of the received signal constant; and received power calculating means for calculating an estimate of received input power received from a mobile station on the basis of scheduling by the scheduling means; wherein the gain controlling means controls the gain of the gain controlling and amplifying means on the basis of the received signal output from the gain controlling and amplifying means and on the basis of the estimate of received input power calculated by the received power calculating means to keep the amplitude of the received signal output from the gain controlling and amplifying means constant. | 08-21-2008 |
| 20080242249 | Three stage algorithm for automatic gain control in a receiver system - In an embodiment, a receiver for processing a RF input signal having a variable signal strength includes an RF amplifier, an IF amplifier, and a controller. The RF amplifier is configured to receive and amplify the RF input signal. The IF amplifier is coupled to an output of the RF amplifier. The controller controls gains of the RF amplifier and the IF amplifier during times of falling signal strength. A gain of the IF amplifier is increased as the signal strength falls until a first amplitude threshold is reached for the falling signal strength. If the signal strength falls beyond the first threshold, a gain of the RF amplifier is increased until a second amplitude threshold is reached. The second amplitude threshold is lower than the first amplitude threshold. If the signal strength falls below the second amplitude threshold, the gain of the IF amplifier is further increased. | 10-02-2008 |
| 20080299929 | Increasing sensitivity of radio receiver - A direct-conversion radio receiver is provided. The receiver includes a first measurement unit configured to measure a signal level of a received signal at an input of the receiver. The receiver also includes a gain controller configured to stepwise adjust at least a front-end gain and a baseband gain of the receiver when the signal level of the received signal at the input of the receiver exceeds a given sensitivity level, and adjust the front-end gain with at least one further gain step when the input signal level is below the given sensitivity level. | 12-04-2008 |
| 20080318539 | AUTOMATIC GAIN CONTROL CIRCUIT FOR VOLUME CONTROL AND CORRESPONDING METHOD FOR VOLUME CONTROL - There is provided an automatic gain control circuit for volume control receiving at least one audio signal input via either a wired connection or a wireless connection. The circuit includes an output signal regulator receiving a first portion of the at least one audio signal input, with the regulator being able to vary an amplitude of the first portion of the at least one audio signal input when a control signal from a circuit controller is received. The circuit controller may be powered by a DC generator; with the DC generator receiving a second portion of the at least one audio signal input. A signal from the output signal regulator may be passed through an acoustic generator. It is preferable that the first portion of the at least one audio signal input is substantially more than the second portion. It is also preferable that the output signal regulator varies the amplitude of the at least one audio signal input by reducing the amplitude. A corresponding method of volume control is also disclosed. | 12-25-2008 |
| 20090029665 | Receiver system and method that detects and attenuates noise in a predetermined frequency range - A receiver system and method for detecting and attenuating noise in a predetermined frequency range. The system includes at least one antenna, at least one filter, at least one automatic gain control device, and at least one processor. The at least one antenna receives at least one signal that includes at least one AM signal. The signal passes through the at least one filter. The at least one automatic gain control device adjusts the gain of the at least one signal to attenuate noise in the at least one signal. The at least one processor performs the steps including detecting when said noise is within a predetermined frequency range, and commanding the at least one automatic gain control device when the detected noise is within the predetermined frequency range, such that the automatic gain control device attenuates the noise that is within the predetermined frequency range. | 01-29-2009 |
| 20090029666 | NOISE CANCELLATION METHOD, RECEIVER CIRCUIT, AND ELECTRONIC INSTRUMENT - A noise cancellation method includes: inputting an interference wave signal detected near a receiver, and changing the phase and the amplitude of the input signal to generate a cancellation signal that cancels the input signal; adding the cancellation signal to a received signal received by the receiver, amplifying the resulting signal by a given amplification factor, and converting the amplified signal into a digital signal; controlling the amplification factor based on a frequency ratio of each signal value of the digital signal; and controlling amounts by which the phase and the amplitude of the input signal are changed, based on the amplification factor. | 01-29-2009 |
| 20090042526 | Methods and apparatus for calibration of automatic gain control in broadcast tuners - In one aspect, a calibration component configured to calibrate an automatic gain controller (AGC) for use in a tuner configured to isolate a selected channel from a multi-channel broadcast signal, the tuner implemented substantially on two chips, a first chip comprising a radio frequency (RF) integrated circuit adapted for RF processing and a second chip comprising a digital integrated circuit adapted for digital processing is provided. The calibration component comprises a calibration signal generator implemented on the RF integrated circuit, the calibration signal generator adapted to generate a generally known calibration signal, a power detector implemented on the RF integrated circuit and configured to detect, during calibration, at least one power characteristic of the calibration signal and to provide a power level signal indicative of the at least one detected power characteristic, a gain controller implemented on the digital integrated circuit, the gain controller adapted to generate at least one error signal based, at least in part, on a comparison between the power level signal provided by the power detector and a first reference signal, an offset signal generator implemented on the RF integrated circuit and configured to generate an offset signal based, at least in part, on the at least one error signal and a summing element implemented on the RF integrated circuit and adapted to combine the offset signal with the power level signal provided by the power detector to provide an adjusted power level signal. | 02-12-2009 |
| 20090088112 | RECEIVING APPARATUS FOR WIRELESS COMMUNICATION, AND RECEIVING METHOD FOR RECEIVING APPARATUS - A receiving apparatus for wireless communication is provided with an offset value calculating unit configured to time-average the received signal from the orthogonal demodulator to the demodulator to detect a DC offset value, and feed back the DC offset value to a signal channel from the orthogonal demodulator to the demodulator, an automatic gain controlling unit configured to calculate and time-average a power of the received signal from the orthogonal demodulator to the demodulator to generate an AGC signal, and control a gain of an amplifier, and a controlling unit configured to control to interlock (synchronize) a DC offset value detecting operation of the offset value calculating unit and an AGC signal generating operation of the automatic gain controlling unit. | 04-02-2009 |
| 20090104883 | AUTOMATIC GAIN CONTROL LOCKED ON TO THE RECEIVED POWER PROBABILITY DENSITY - The invention relates to a radio receiver, notably for applications of satellite positioning, that must operate in an environment in which the interference is dense, notably when it involves pulses transmitted by DME beacons. The effective processing of the interference assumes having an unbiased noise reference. According to the invention, the latter is generated by a signal power probability function analysis in its portion essentially comprising low-power signals. | 04-23-2009 |
| 20090111415 | AUTOMATIC GAIN CONTROL CIRCUIT USING GAIN SHIFT - An AGC circuit includes a low noise RF amplifying module with an adjustable gain, a frequency converter, an IF/Baseband amplifying module with an adjustable gain, an A/D converter, an AGC module and a gain distribution module. The AGC module is configured for detecting a level of a digital IF/Baseband signal outputted from the A/D converter, comparing the detected level with a reference level and generating a digital AGC signal and a digital gain distribution control signal based upon the comparison result. The gain distribution module is subject to control of the digital AGC signal and digital gain distribution control signal and configured for generating digital gain control signals to selectively adjust at least one of the gains of the low noise RF amplifying module and the IF/Baseband amplifying module in a digital manner to keep an IF/Baseband signal outputted from the IF/Baseband amplifying module at a desired level. | 04-30-2009 |
| 20090117868 | Fast Settling Radio Receiver Automatic Gain Control System - A fast settling AGC system includes a “fast settle” comparator that facilitates fast settling of strong radio receiver output signals from a maximum to an intermediate voltage level at the start of each transmission burst, and a “normal” AGC comparator that further settles the output signal from the intermediate voltage level to a desired target output voltage level at a slower “normal” rate. The gain control signal components generated by both the “fast settle” comparator and the “normal” AGC comparator are summed and applied to the gain control terminal of a variable gain amplifier. The gain control signal component generated by the “fast settle” comparator has a higher current level than the gain control signal component generated by the “normal” comparator, but is terminated when receiver output signal drops to the intermediate voltage level. | 05-07-2009 |
| 20090137220 | VARIABLE GAIN AMPLIFIER AND RECEIVER INCLUDING THE SAME - Provided are a variable gain amplifier and a receiver including the same. The variable gain amplifier includes: a gain controller generating a gain control voltage; a variable gain amplifier amplifying an input signal and a feedback signal by using a voltage gain that is linearly proportional to the gain control voltage, and converting the amplified signal into a predetermined magnitude of a signal; and an offset canceller removing an offset from an output signal of the variable gain amplifier and outputting the offset removed result as the feedback signal. The variable gain amplifier includes a plurality of operational transconductance amplifiers. | 05-28-2009 |
| 20090163163 | RECEIVER - A receiver has a pre-stage variable gain amplifier configured to amplify an RF signal received by an antenna, a frequency converter configured to convert an output signal of the pre-stage variable gain amplifier into a low frequency signal to output the low frequency signal, a filter unit configured to selectively extract a receiving channel frequency band component from the low frequency signal, a post-stage variable gain amplifier configured to amplify the output signal of the filter unit, a pre-stage amplifier controller configured to adjust a gain of the pre-stage variable gain amplifier so that an output amplitude of the frequency converter approaches a target value, a post-stage amplifier controller configured to adjust a gain of the post-stage variable gain amplifier so that an output amplitude of the post-stage variable gain amplifier approaches a target value, and an adaptive controller configured to detect a receiving status based on the gain of the pre-stage variable gain amplifier and the gain of the post-stage variable gain amplifier, and control a circuit property of at least a portion of a circuit block from the pre-stage variable gain amplifier to the post-stage variable gain amplifier based on the detected result. | 06-25-2009 |
| 20090163164 | RECEPTION DEVICE, RECEPTION METHOD AND PROGRAM - A reception device includes: an AGC circuit adapted to control the amplitude of a receive signal; a correction circuit adapted to correct the flutter component in the output signal of the AGC circuit; a synchronization circuit adapted to establish synchronization with the signal whose flutter component has been corrected by the correction circuit; and an equalization circuit adapted to perform an equalization process based on the signal with which synchronization has been established by the synchronization circuit and output the equalized signal, wherein the correction circuit includes a detection circuit, an IIR filter, a gain circuit, a flutter component correction circuit, and a gain control circuit. | 06-25-2009 |
| 20090170460 | Amplifier Gain Control - The present invention discloses an automatic gain controller with an amplifier ( | 07-02-2009 |
| 20090209219 | RF RECEIVER DEVICE - A radio-frequency receiver includes an RF amplification circuit which amplifies a received RF signal and generates an amplified RF signal, a mixing circuit which converts the amplified RF signal into an intermediate-frequency signal, an IF amplification circuit which generates an amplified IF signal, a first level detection circuit which detects a level of the amplified RF signal, a second level detection circuit which detects a level of the IF signal, a third level detection circuit which detects a level of the amplified IF signal, a RF reference level generation circuit which generates an RF reference level based on one of respective detection signal levels of the first and second level detection circuits, and an RF gain control circuits which controls an amplification gain of the RF amplification circuit so that a detection signal level of the third level detection circuit becomes equal to the RF reference level. | 08-20-2009 |
| 20090209220 | RECEIVER HAVING LOW POWER CONSUMPTION AND METHOD THEREOF - The present invention provides a receiver having low power consumption and method thereof. The receiver with low power consumption adjusts the gain based on the automatic gain control information. The receiver acquires the signal peaks both after and before a channel selection filter and further analyzes the wanted signal and interference signal with respect to the signal peaks. The receiver determines the magnitude of the wanted signal and determines whether the interference signal exists. The receiver provides the signals with optimal current correspondingly in order to effectively decrease the power consumption of the receiver. | 08-20-2009 |
| 20090209221 | RECEIVER WITH LOW POWER CONSUMPTION - The present invention provides a receiver with low power consumption. The receiver with low power consumption adjusts the gain of the programmable gain amplifier based on the automatic gain controller and further optimizes the gain bandwidth product by current-adjusting unit. The current-adjusting unit thus adjusts the current provided for the programmable gain amplifier, e.g. operational amplifier. Therefore, the gain bandwidth product of the programmable gain amplifier is optimized and the power consumption of the receiver is effectively decreased. | 08-20-2009 |
| 20090221252 | LOW COMPLEXITY AGC FOR MB-OFDM - System and methodologies for amplifier gain control in a communication system are provided herein. By leveraging similarities between the distribution of received signal samples in an MB-OFDM system and a Gaussian distribution, various algorithms described herein can be utilized to perform fast and low-complexity amplifier gain tuning. Received signal strength indication information corresponding to analog signal samples and/or digital signal samples obtained from an analog to digital converter are analyzed to obtain a signal energy distribution. The obtained signal energy distribution is then compared to a reference Gaussian distribution to adaptively tune an associated amplifier gain. | 09-03-2009 |
| 20090239491 | SIGNAL DISTRIBUTION SYSTEM CASCADABLE AGC DEVICE AND METHOD - A cascadable AGC amplifier in a signal distribution system includes a low noise cascadable amplifier having a through path and a cascadable output. The cascadable amplifier is also configured to provide AGC over a predetermined input power range. The cascadable AGC amplifier can be configured to provide gain or attenuation. When the cascadable AGC amplifier is implemented in a signal distribution system, typically as part of a signal distribution device, an input signal can be gain controlled and supplied to multiple signal paths without distortion due to degradation of signal to noise ratio or distortion due to higher order amplifier products. The distributed signal is not significantly degraded by distortion regardless of the number of cascadable AGC amplifiers connected in series or the position of the cascadable AGC amplifier in the signal distribution system. | 09-24-2009 |
| 20090247104 | VEHICLE ANTENNA - A vehicle antenna includes a first Automatic Gain Control (AGC) unit and a second AGC unit. The first AGC unit may attenuate an input signal based on the strength of the input signal, and then output the attenuated signal to a transistor. The second AGC unit may control a power to be supplied or not to the transistor using a switching function based on the strength of the input signal. With the antenna, the signals of a strong electric field as well as the signals of a weak electric field adjacent to the strong electric field can be effectively controlled. | 10-01-2009 |
| 20090253396 | WIRELESS COMMUNICATION APPARATUS - A wireless communication apparatus includes a local oscillator that generates a plurality of LO (Local Oschillation) signals corresponding to frequencies of a plurality of input RF (Radio Frequency) signals, an accumulator that accumulates the plurality of LO signals generated by the local oscillator to generate an accumulated signal, a mixer that mixes the plurality of RF signals and the accumulated signal generated by the accumulator and to generate a plurality of base band signals, and a first signal processing unit that executes a signal process with respect to the plurality of base band signals generated by the mixer. | 10-08-2009 |
| 20090258623 | RECEIVER HAVING VOLTAGE-TO-CURRENT AND CURRENT-TO-VOLTAGE CONVERTERS - A receiver ( | 10-15-2009 |
| 20090258624 | METHOD AND APPARATUS FOR PROCESSING A COMMUNICATION SIGNAL IN A RECEIVER - A receiver includes a jammer detector configured to detect the presence or the absence of jamming in a communication signal within a gain state. The receiver further includes an amplifier configured to amplify the communication signal in a high linearity receiving mode or a low linearity receiving mode, wherein the high linearity receiving mode corresponds with a lower gain for the gain state in the amplifier relative to that of the low linearity receiving mode. In addition, the receiver includes a processing unit coupled to the jammer detector, the processing unit being configured to control the amplifier to amplify the communication signal in either the high linearity receiving mode or the low linearity receiving mode, based on the output of the jammer detector detecting the presence or the absence of jamming in the communication signal. A method is also provided for processing a communication signal in a receiver. | 10-15-2009 |
| 20090258625 | GAIN PARTITIONING IN A RECEIVER - An automatic gain control loop disposed in a receiver is adapted to compensate for varying levels of out of band interference sources by adaptively controlling the gain distribution throughout the receive signal path. One or more intermediate received signal strength indicator (RSSI) detectors are used to determine a corresponding intermediate signal level. The output of each RSSI detector is coupled to an associated comparator that compares the intermediate RSSI value against a corresponding threshold. The take over point (TOP) for gain stages is adjusted based in part on the comparator output values. The TOP for each of a plurality of gain stages may be adjusted in discrete steps or continuously. | 10-15-2009 |
| 20090298454 | RECEIVER - By A/D converting a signal output from a mixer ( | 12-03-2009 |
| 20090305655 | RECEIVER HAVING A GAIN-CONTROLLABLE INPUT AMPLIFIER - A receiver has an input amplifier (RFAMP) that comprises a signal-voltage amplifier (SVA) and a feedback path (FBP). The signal-voltage amplifier (SVA) provides a voltage gain (VG) from an input node (SESf) to an output node (SON). The voltage gain (VG) is controllable. The feedback path (FBP) provides a transadmittance (GM) from the output node (SON) to the input node (SIN). The transadmittance (GM) is controllable. | 12-10-2009 |
| 20100009646 | AUTOMATIC GAIN CONTROL OF RADIO DEVICES - A method of operating a RF device having a first RF gain stage ( | 01-14-2010 |
| 20100048155 | MULTI-BAND RF RECEIVER - A first RF receiving path and a second RF receiving path are activated selectively. An interstage filter is connected with the first RF receiving path and the second RF receiving path, and passes a prescribed frequency band of an RF signal output from an active RF receiving path. A frequency converter unit converts a signal output from the interstage filter into an IF signal. A bandwidth of the interstage filter corresponds to a center frequency of an RF signal to be received by the first RF receiving path. The second RF receiving path includes a center frequency shift unit that shifts a center frequency of a received RF signal so that it is included in a frequency band to pass through the interstage filter. | 02-25-2010 |
| 20100062736 | AUTO GAIN CONTROLLER AND CONTROL METHOD THEREOF - An auto gain controller (AGC) and a control method thereof are provided. An input signal is amplified by a radio frequency (RF) amplifier and an intermediate frequency (IF) amplifier. When strength of the input signal is lower than a threshold, a gain curve of the RF amplifier is lowered while a gain curve of the IF amplifier is raised. When the strength of the input signal is greater than the threshold, a takeover point (TOP) of the IF amplifier is changed from a first takeover point to a second takeover point. | 03-11-2010 |
| 20100159863 | APPARATUS AND METHOD FOR PERFORMING ATTENUATION FUNCTION IN CABLE BROADCAST RECEIVER - An apparatus and a method for performing an attenuation function on a signal using an attenuator in a cable broadcast receiver having a Low Noise Amplifier (LNA) that does not perform an attenuation function on a signal are provided. In the method, an input Radio Frequency (RF) signal is tuned, The RF signal is converted into an Intermediate Frequency (IF) signal. An intensity of the converted IF signal is compared to a threshold, and an RF Automatic Gain Control (AGC) value is generated based on a result of the comparison. When the generated RF AGC value is smaller than an RF AGC threshold, the attenuator is turned on to attenuate the input RF signal by a predefined amount. Therefore, a high SNR, such as in an analog-digital composite signal, may be obtained without using an LNA that performs an attenuation function on a signal. | 06-24-2010 |
| 20100184397 | METHOD AND SYSTEM FOR DC COMPENSTATION - A technique for performing AGC and DC compensation in a receiver. The receiver comprises an energy estimator for generating an estimate of the level of a received signal; an RF device to apply gain to the received signal; an AGC for controlling the RF device gain based on the energy estimation; a first DC compensation loop for finely adjusting the DC component of the received signal in fast or slow tracking mode (FTM or STM); and a second DC compensation loop for coarsely adjusting the DC component of the received signal. Three modes of AGC operations: In Acquisition, iterations of FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during signal timing detection. In Connected, long energy estimation, RF device gain adjustment, and STM fine and coarse DC adjustments are performed during superframe preamble. In Sleep, FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during superframe preamble. | 07-22-2010 |
| 20100190459 | AUTOMATIC GAIN CONTROL IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing automatic gain control (AGC) at a terminal in a wireless communication network are described. In an aspect, the terminal may use different receiver gain settings to receive different types of signals in different time intervals. The terminal may determine a receiver gain setting for each signal type and may use the receiver gain setting to receive signals of that signal type. In another aspect, the terminal may determine a receiver gain setting for a future time interval based on received power levels for peer terminals expected to transmit in that time interval. The terminal may measure received power levels of signals received from a plurality of terminals. The terminal may determine a set of terminals expected to transmit in the future time interval and may determine the receiver gain setting for the future time interval based on the measured received power levels for the set of terminals. | 07-29-2010 |
| 20100197262 | RECEPTION DEVICE AND RECEPTION METHOD - The noise amount information storage unit | 08-05-2010 |
| 20100267351 | RECEIVER AND GAIN CONTROL METHOD - A receiver capable of performing optimum automatic gain control responsive to a peak factor of an input signal before subjected to A/D conversion is provided in a simple configuration. A peak detector | 10-21-2010 |
| 20100304700 | SIGNAL PROCESSING DEVICE AND METHOD AND RECEPTION SYSTEM - Disclosed herein is a signal processing device including an adjustment section configured to adjust the power of each of subinterval signals by multiplying the subinterval signals by a gain adapted to bring the power to a given level, the subinterval signals being input signals each having a frequency component of one of a plurality of subintervals into which the frequency band over which the power spectrum is to be measured is divided, and a correction section configured to correct the power of each of the subinterval signals, whose power has been adjusted by the adjustment section, by multiplying the power spectrum by the reciprocal of the gain used for adjustment of the power by the adjustment section. | 12-02-2010 |
| 20110021168 | METHOD AND APPARATUS FOR RECEIVER WITH DUAL MODE AUTOMATIC GAIN CONTROL (AGC) - A method and apparatus for toggling between a first mode and a second mode of a receiver based on an input signal level comprising comparing a gain state of the receiver to at least one gain state thresholds; determining the presence of a jammer; and switching a current mode of the receiver to a new mode based on the presence of the jammer and the comparison of the gain state. In one aspect, the apparatus comprises two LNAs operating in different modes; a jammer detector to provide a jammer interrupt bit to indicate the presence of a jammer; and an automatic gain control (AGC) circuit coupled to the jammer detector for receiving the jammer interrupt bit, wherein the AGC circuit selects between the two LNAs based on the jammer interrupt bit and a gain state comparison. | 01-27-2011 |
| 20110028112 | Detection of false modulated signals in wireless communications - There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described. | 02-03-2011 |
| 20110053541 | DYNAMIC RANGE ON-DEMAND FOR RECEIVER APPLICATIONS - Receiver power techniques are disclosed that allow for real-time adjustment of receiver dynamic range by virtue of supplied DC power, based on signal strengths currently received by the receiver. The disclosed techniques use real-time monitoring of receiver output to detect the presence of large signals, and to then adjust bias points in the receiver to reduce DC power consumption in the absence of large signals. By adapting the power to the current signal environment by autonomously adjusting the bias points, the mean power consumption of the receiver can be greatly reduced. This in turn has a number of benefits, such as increased battery life, decreased heat, increased circuit lifetime, and decreased noise figure. | 03-03-2011 |
| 20110059711 | WCDMA AGC RECEIVER SNR ADJUSTMENT AND SIGNALLING - The present invention relates to a method, an Automatic Gain Control control unit and a receiver for Noise change output signalling. It also relates to an Adjustment Unit, a receiver and a base band detector for adjustment of an Automatic Gain Control output signal on the basis of the Noise change output signalling. In a first step a receiver receives a communication input signal. In a second step at least one Automatic Gain Control attenuator or amplifier in the receiver attenuates the communication input signal. In a third step the receiver produces at least one AGC output signal. In a fourth step at least one AGC control unit in the receiver initiates a changed gain setting on the receiver, when the level of an AGC control unit input signal received by the unit has been below a first threshold level or above a second threshold level during a detection interval. | 03-10-2011 |
| 20110070856 | AGC LOW THRESHOLD SIGNAL LEVEL DETECTION - The invention provides a receiver comprising an input end, an Rx-chain with at least one regulating means and an output end. The receiver further comprises a feedback loop in the Rx-chain, said regulating means arranged for providing a higher or lower gain setting. The feedback loop comprises an AGC Multilevel threshold detector unit, AMU. The AMU comprises at least one Low Multilevel Threshold Detector, LMTD, and said LMTD comprises at least two threshold detectors, each detector having an associated low threshold level and detection interval, the length of the detection interval being shorter the lower the low threshold level is arranged to be set. The higher gain setting being arranged to be initiated through the feedback loop when the absolute level of an AGC input signal has been below at least one of the low threshold levels during the entire detection interval associated with that low threshold level. The invention also provides a communication system comprising the receiver, an AGC Multilevel threshold detector Unit (AMU) and a method to adjust the gain in a receiver. | 03-24-2011 |
| 20110092175 | MOBILE COMMUNICATION APPARATUS - A transceiver suitable for larger scale of integration employs direct conversion reception for reducing the number of filters. Also, the number of VCOs is reduced by utilizing dividers to supply a receiver and a transmitter with locally oscillated signals at an RF band. Dividers each having a fixed division ratio are used for generating locally oscillated signals for the receiver, while a divider having a switchable division ratio are used for generating the locally oscillated signal for the transmitter. In addition, a variable gain amplifier for baseband signal is provided with a DC offset voltage detector and a DC offset canceling circuit for supporting high speed data communications to accomplish fast cancellation of a DC offset by eliminating intervention of a filter within a feedback loop for offset cancellation. | 04-21-2011 |
| 20110230156 | Dynamic Gain Assignment in Analog Baseband Circuits - A system and method is provided for filtering and amplifying a signal where amplification can be distributed between stages of a filter and gain can be assigned throughout the filter to optimize system performance. Such a system can be implemented in the baseband section of RF receivers. VGAs can be implemented between filter stages, such as biquads, or VGAs can be incorporated in filter stages. Substantially linear VGAs comprising a parallel resistor array can be incorporated in the circuitry of the filter stages to reduce distortion. Gain can be assigned dynamically in the amplification stages to improve noise and/or linearity performance. For example, gain assignments can be implemented so that high power undesired signal components are filtered out before amplification to prevent component saturation, and low power signals are amplified before they are filtered to improve noise performance. | 09-22-2011 |
| 20120021712 | Compact low-power receiver including transimpedance amplifier, digitally controlled interface circuit, and low pass filter - According to one embodiment, a compact low-power receiver comprises first and second analog circuits connected by a digitally controlled interface circuit. The first analog circuit has a first direct-current (DC) offset and a first common mode voltage at an output, and the second analog circuit has a second DC offset and a second common mode voltage at an input. The digitally controlled interface circuit connects the output to the input, and is configured to match the first and second DC offsets and to match the first and second common mode voltages. In one embodiment, the first analog circuit is a variable gain control transimpedance amplifier (TIA) implemented using a current mode buffer, the second analog circuit is a second-order adjustable low-pass filter, whereby a three-pole adjustable low-pass filter in the compact low-power receiver is effectively produced. | 01-26-2012 |
| 20120034893 | ENVELOPE POWER SUPPLY CALIBRATION OF A MULTI-MODE RADIO FREQUENCY POWER AMPLIFIER - The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom. | 02-09-2012 |
| 20120071127 | AUTOMATIC GAIN CONTROL DEVICE, RECEIVER, ELECTRONIC DEVICE, AND AUTOMATIC GAIN CONTROL METHOD - An automatic gain control device includes an amplifier which amplifies an input signal based on a gain control signal, and outputs an amplified signal, a converter which converts the amplified signal into a converted signal having a value corresponding to an absolute value of the amplified signal, a peak detector which removes, during a peak detection period, from values of the converted signal, a predetermined number of values which include a maximum value, and determines a peak level of the converted signal after the removing, an error calculator which calculates an error between the peak level and a reference signal, and outputs the error as an error signal, and a gain controller which updates the gain control signal based on the error signal, and outputs an updated gain control signal. | 03-22-2012 |
| 20120142298 | RF PEAK DETECTION SCHEME USING BASEBAND CIRCUITS - A receiver includes an antenna configured to receive a set of RF signals, and a low-noise amplifier (LNA) coupled to the antenna and amplify the set of RF signals to generate a set of amplified signals. The receiver further includes a down-conversion mixer configured to down convert the set of amplified signals to baseband frequencies. The receiver further includes a low-pass filter configured to filter from the set of amplified signals to baseband frequencies an out-of-band signal. The receiver further includes a high-pass filter configured to reverse the filtering of the low-pass filter. The receiver further includes a peak detector configured to determine whether the LNA is operating at saturation; and an automatic-gain controller configured to decrease a gain of the LNA based on the determination of the peak detector. | 06-07-2012 |
| 20120149322 | In-situ Gain Calibration of Radio Frequency Devices Using Thermal Noise - An apparatus for calibrating gain of an radio frequency receiver (“Rx”) is disclosed to provide, among other things, a structure for performing in-situ gain calibration of an RF integrated circuit over time and/or over temperature without removing the RF integrated circuit from its operational configuration, especially when the gain of the RF integrated circuit is susceptible to variations in process, such as inherent with the CMOS process. In one embodiment, an exemplary apparatus includes a thermal noise generator configured to generate thermal noise as a calibrating signal into an input of an Rx path of an RF integrated circuit. The apparatus also includes a calibrator configured to first measure an output signal from an output of the Rx path, and then adjust a gain of the Rx path based on the thermal noise. In one embodiment, the thermal noise generator further includes a termination resistance and/or impedance. | 06-14-2012 |
| 20120178394 | BROADCAST RECEIVING APPARATUS - A broadcast receiving apparatus having a seek function of sweeping a received frequency, stopping the sweeping if the level of the received signal is equal to or higher than a threshold level of an S meter signal in SD check (SD check results in H determination), and setting a reception state with the received frequency includes a signal meter configured to detect the level of the received signal, and an AGC circuit configured to control the level of the received signal with the field strength of an input signal. In this case, if the direct current value to be applied to the PIN diode is equal to or higher than a predetermined direct current value, the threshold level of the S meter signal is changed to a lower value under a state where the AGC circuit is operating because a neighboring interfering channel exists. | 07-12-2012 |
| 20120178395 | Dynamic Impedance Matching with LNA - Aspects of a method and system for LNA adjustment to compensate for dynamic impedance matching are provided. In this regard, an antenna matching network may be configured to maximize received signal strength for a determined frequency and an amplifier gain may be adjusted based on the maximized signal strength such that output levels of the amplifier are between specified limits. The antenna matching network may be programmatically controlled via one or more switching elements. The amplifier gain may be programmatically controlled via one or more bias points. The antenna matching network may be configured for a plurality of frequencies in a frequency band, such as an FM broadcast band, and a configuration for each frequency may be stored. Accordingly, when the receiver is tuned to a frequency, a corresponding configuration may be retrieved from memory. | 07-12-2012 |
| 20120184233 | COMBINED RF DETECTOR AND RF ATTENUATOR WITH CONCURRENT OUTPUTS - Radio Frequency (RF) signal conditioning circuitry, which includes RF detection circuitry and RF attenuation circuitry is disclosed. The RF detection circuitry receives and detects an RF sample signal to provide an RF detection signal. The RF attenuation circuitry has an attenuation circuitry input, and receives and attenuates the RF sample signal via the attenuation circuitry input to provide an attenuated RF signal. The RF attenuation circuitry presents an attenuation circuitry input impedance at the attenuation circuitry input. The attenuated RF signal and the RF detection signal are provided concurrently. | 07-19-2012 |
| 20130029624 | METHOD OF DIMINISHING THE MINIMUM RANGE OF OPERATION OF A COMMUNICATION LINK - A portable electronic device comprises a wireless receiver unit for receiving a wireless signal from a transmitting device, the wireless receiver unit comprising an antenna receiving an electromagnetic signal and providing a received electric input signal, and a receiver providing a recovered electric signal from the received electric input signal, and an impedance matching circuit matching the electric impedance of the antenna to the receiver, the receiver comprising a gain stage comprising an Automatic Gain Control unit automatically determining an AGC-gain value for application to an AGC-input signal to provide an appropriate signal level when the level of said AGC input signal is in a range between a minimum and a maximum signal level corresponding to maximum and minimum AGC-gain values, respectively. The portable device further comprises a control unit receiving the AGC-gain value and providing a control signal depending on said AGC-gain value to the impedance matching circuit. | 01-31-2013 |
| 20130059556 | WIRELESS COMMUNICATION DEVICE AND SYSTEM - The present invention is directed to a wireless communications device that includes an antenna configured to receive an RF signal from an ambient environment. The antenna is characterized by an antenna impedance and the RF signal is characterized by a predetermined frequency. A passive mixer assembly is coupled to the antenna without an RF matching network. The passive mixer assembly is characterized by a passive mixer impedance presented to the antenna. The passive mixer assembly includes a plurality of baseband mixer ports. The passive mixer assembly is configured to downconvert the RF signal and provide a plurality of baseband signals. Each baseband signal of the plurality of baseband signals is directed out of a corresponding port of the plurality of baseband mixer ports and characterized by a predetermined phase of a plurality of predetermined phases. A baseband low noise amplifier (baseband-LNA) assembly is coupled to the passive mixer assembly. The baseband-LNA assembly includes a baseband-LNA input portion configured to receive the plurality of baseband signals from the passive mixer assembly. The baseband-LNA assembly is configured to provide a plurality of amplified baseband signals from a baseband-LNA output portion. A baseband feedback network is coupled between the baseband-LNA output portion and the baseband-LNA input portion. The baseband feedback network includes a plurality of first adjustable resistive components. The plurality of first adjustable resistive components is selectively adjustable such that the passive mixer impedance is substantially matched to the antenna impedance at the predetermined RE frequency. | 03-07-2013 |
| 20130090079 | RECEPTION SYSTEM INCLUDING A MECHANISM COUNTERING PULSED INTERFERENCE - A system for receiving an analogue signal e including means for amplifying and digitizing said signal in order to obtain a digitized signal e | 04-11-2013 |
| 20130095780 | TRANSPONDER WITH RECEIVING MEANS HAVING A LOW ELECTRICAL CONSUMPTION IN A LISTENING MODE - The transponder comprises an antenna and a receiver circuit ( | 04-18-2013 |
| 20130115904 | Synchronizing and Detecting Interference in Wireless Receiver - Interference detection involves detecting the interference component in the received signal if there is such a component, controlling a band reject filter according to the detected interference component to filter the received signal to suppress the interference component, and synchronizing the receiver to the received signal, wherein the step of detecting the interference component is started before synchronization is achieved. By starting the interference detection without waiting for synchronization to be achieved, rather than following the synchronization, then the interference detection is no longer dependent on the synchronization being achieved. | 05-09-2013 |
| 20130149981 | Second Order Intermodulation Canceller - A technique for cancelling out target IM2 components in a wireless receiver's mixer output is disclosed. A differential RF signal and a differential local oscillator (LO) signal are mixed by a mixer to demodulate the RF signal. A first common node signal is generated between a first resistor and a second resistor coupled across the mixer's differential output terminals. A second common node signal is generated between a third resistor and a fourth resistor coupled across the differential output terminals, where a capacitor is coupled between the second common node and a power supply terminal. The second common node signal provides a stable reference signal for IM2 components above a certain frequency. The two common node signals are subtracted to create a difference signal. The difference signal is scaled by a scaling factor obtained during calibration. The scaled difference signal is coupled to the mixer output to offset IM2 distortion. | 06-13-2013 |
| 20130225107 | WIRELESS DEVICE WITH FILTERS TO SUPPORT CO-EXISTENCE IN ADJACENT FREQUENCY BANDS - Techniques for using a narrow filter located before a power amplifier to reduce interference in an adjacent frequency band are disclosed. In an exemplary design, an apparatus (e.g., a wireless device) includes the narrow filter and the power amplifier. The narrow filter is for a first frequency band (e.g., Band 40) and has a first bandwidth that is more narrow than the first frequency band. The narrow filter receives and filters an input radio frequency (RF) signal and provides a filtered RF signal. The power amplifier receives and amplifies the filtered RF signal and provides an amplified RF signal. The apparatus may further include a full filter for the first frequency band and located after the power amplifier. The full filter receives and filters the amplified RF signal and provides an output RF signal when it is selected for use. | 08-29-2013 |
| 20130237169 | MULTIPLE FREQUENCY BAND MULTIPLE STANDARD TRANSCEIVER - A transceiver includes a receiver section and a transmitter section. The receiver section converts an inbound Multiple Frequency Bands Multiple Standards (MFBMS) signal into a down converted signal, wherein the inbound MFBMS signal includes a desired signal component and an undesired signal component. In addition, the receiver section determines spectral positioning of the undesired signal component with respect to the desired signal component and adjusts at least one of the MFBMS signal and the down converted signal based on the spectral positioning to substantially reduce adverse affects of the undesired signal component on the desired signal component to produce an adjusted signal. The transmitter section converts an outbound symbol stream into an outbound MFBMS signal. | 09-12-2013 |
| 20130281039 | Reconfigurable Wide-Band Receiver with Positive Feed-Back Translational Loop - The invention relates to a device comprising a direct path block with an input and an output, and a feedback block with an input and an output, the input of the direct path block being adapted to receive a multi-channel input signal with a given frequency range and the output of the direct path block being adapted to output an output signal with a base band frequency range, the output of the direct path block being coupled to the input of the feedback block and the input of the direct path block being coupled to the output of the feedback block. The direct path block comprises a first transposing unit ( | 10-24-2013 |
| 20130303101 | GAIN CONTROL CIRCUIT AND RECEIVING SYSTEM - Disclosed herein is a gain control circuit including: an amplifying section configured to amplify an input voltage in such a manner that amplitude of an output voltage at an output terminal is kept constant; an allowable voltage acquirer configured to acquire an allowable voltage of an apparatus connected to the output terminal; a voltage divider configured to divide the output voltage according to a ratio between a maximum voltage of the amplified input voltage and the allowable voltage; and an adjusting section configured to further amplify the amplified input voltage according to the ratio and supply a resulting voltage to the output terminal. | 11-14-2013 |
| 20130309988 | APPARATUS AND METHODS FOR ADJUSTING ADAPTIVE CONTROL LOOP BEHAVIOR BASED ON MEASURED ARTIFACTS - Methods and apparatus for adjusting adaptive control loop behavior based on, for example measured artifacts of the radio environment. In one embodiment, a Long Term Evolution (LTE) user equipment (UE) adjusts one or more Automatic Gain Control (AGC) loops based on a measured Doppler spread of received signals. Specifically, one or more AGC parameters (e.g., set-point, loop gain, etc.) are selected based on a measured Doppler spread. The one or more AGC parameters are configured to optimize both the AGC headroom (e.g., dynamic range) and the signal to quantization plus noise ratio (SQNR) of the receiver under dynamic wireless fading channels for the detected Doppler. | 11-21-2013 |
| 20130316670 | MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) LOW NOISE AMPLIFIERS FOR CARRIER AGGREGATION - Multiple-input multiple-output (MIMO) low noise amplifiers (LNAs) supporting carrier aggregation are disclosed. In an exemplary design, an apparatus (e.g., a wireless device, an integrated circuit, etc.) includes a MIMO LNA having a plurality of gain circuits, a drive circuit, and a plurality of load circuits. The gain circuits receive at least one input radio frequency (RF) signal and provide at least one amplified RF signal. Each gain circuit receives and amplifies one input RF signal and provides one amplified RF signal when the gain circuit is enabled. The at least one input RF signal include transmissions sent on multiple carriers at different frequencies to the wireless device. The drive circuit receives the at least one amplified RF signal and provides at least one drive RF signal. The load circuits receive the at least one drive RF signal and provide at least one output RF signal. | 11-28-2013 |
| 20130324065 | Method and Apparatus for Auto Gain Control in Radio Receiver - The present invention relates to the field of communication technologies and discloses a method and an apparatus for auto gain control (AGC) in a radio receiver, which can ensure that a radio frequency device, an analog device, and various nodes in a digital domain are non-saturated and that useful signal power is adjusted to a certain power level. According to the present invention, total signal power on an air interface is subtracted from a preset first target power to obtain an analog auto gain control (AAGC) gain, and then a second target power is subtracted from an interference signal power in a digital baseband to obtain a digital auto gain control (DAGC) gain. | 12-05-2013 |
| 20130337758 | WIRELESS RECEIVER AND ELECTRONIC DEVICE WITH SIGNAL GAIN AND REDUCTION - A wireless receiver includes a low noise amplifier (LNA), a tuner, a demodulator, and an automatic gain controller (AGC). The LNA receives a radio frequency (RF) signal and amplifies the received RF signal. The tuner converts the amplified RF signal to an intermediate frequency (IF) signal. The demodulator demodulates the IF signal. The AGC generates a gain control signal. The LNA applies normal mode to amplify the received RF signal when the gain control signal is larger than a first predetermined voltage; and enters a degradation mode to reduce the strength of the received RF signal when the gain control signal is below a second predetermined voltage lower than the first predetermined voltage. | 12-19-2013 |
| 20130344833 | ENVELOPE POWER SUPPLY CALIBRATION OF A MULTI-MODE RADIO FREQUENCY POWER AMPLIFIER - The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom. | 12-26-2013 |
| 20140018027 | TECHNIQUE FOR AUTOMATIC GAIN CONTROL - A technique for performing Automatic Gain Control for a receiver ( | 01-16-2014 |
| 20140065995 | RECEIVER OF RADIO FREQUENCY SIGNALS - There is described a receiver of at least one radiofrequency modulated signal deriving from an antenna external to the receiver; the receiver comprises a first stage for the low noise amplification of the radiofrequency modulated signal and a demodulation stage of the above-mentioned signal. The receiver comprises a SAW filter adapted to act as a pass band filter about a predetermined frequency for the signal deriving from the first stage, a logarithmic amplifier adapted to amplify the signal deriving from the SAW filter, a peak detector of the output signal of the logarithmic amplifier, means adapted to control the gain of the first stage for the amplification of the radiofrequency modulated signal as a function of the output signal (Vopeak) of the peak detector. | 03-06-2014 |
| 20140171004 | AUTOMATIC GAIN CONTROL OF A RECEIVER CIRCUIT - The present invention relates to a receiver circuit for processing of electrical signals, and comprising:
| 06-19-2014 |
| 20140248846 | TERRESTRIAL BROADCAST WAVE RECEPTION-USE ANTENNA DEVICE AND COMPONENT OF SAME - Provided is a terrestrial broadcast wave reception-use antenna device having performance that is equivalent to or better than that of a conventional device in frequency bands at or below an FM band even if an antenna element length is shortened to approximately 55 [mm]. An amplifier ( | 09-04-2014 |
| 20140323074 | POWER MANAGEMENT FOR A BATTERY-POWERED HANDHELD AUDIO DEVICE - A method for managing power of a battery powered handheld audio device by receiving an indicia of signal quality for a received continuous-time radio signal. The method compares the indicia of signal quality to a signal threshold. Upon a favorable comparison, enacting a first analog signal conditioning setting. Upon an unfavorable comparison, enacting a second analog signal conditioning setting. The method further provides, upon the favorable comparison, disabling a digital filtering operation, and upon the unfavorable comparison, enabling the digital filtering operation. | 10-30-2014 |
| 20150303960 | FAST AUTOMATIC GAIN CONTROL (AGC) FOR PACKET BASED SYSTEMS - A method and apparatus for use in a packet based wireless communication system for reducing automatic gain control (AGC) convergence time at a receiver are described. A radio frequency (RF) signal is received. The RF signal includes a sequence of a plurality of pre-defined power levels at a beginning of a preamble of the RF signal. Statistics for each of the plurality of pre-defined power levels at the beginning of the preamble of the RF signal are computed. An appropriate gain for a variable gain amplifier (VGA) is then computed based on the computed statistics for each of the plurality of pre-defined power levels and a-priori information related to transmission power differences between the plurality of pre-defined power levels of the sequence. | 10-22-2015 |
| 20150333718 | RADIO RECEIVER - A baseband signal-conditioning architecture applicable to radio receivers uses switched-capacitor techniques to provide high-performance signal conditioning in low-voltage, deep-submicron processes (e.g., 65 nm and below). In the architecture, a first mixer is coupled to an antenna receiving the signal, and outputs a first mixer output signal based on the signal received by the antenna. A buffer coupled to an output of the first mixer outputs a buffer signal based on the first mixer output signal. A first charge pump is coupled to an output of the buffer, and produces a first charge pump output signal based on the buffer signal. In some examples, a second charge pump is coupled to the output of the first mixer and produces a second charge pump output signal based on the first mixer output signal, and the buffer input is coupled to an output of the second charge pump. | 11-19-2015 |
| 20150357984 | RECEIVING DEVICE AND CONTROL METHOD FOR RECEIVING DEVICE - There are provided a receiving device that can enhance the degree of freedom of sound volume correction by a construction of quantitatively variably controlling the gain of an antenna amplifier, and a method of controlling the receiving device. | 12-10-2015 |
| 20160056784 | LOW NOISE, PROGRAMMABLE GAIN CURRENT BUFFER - A receiver includes LNA-mixer arrangement, a current buffer arrangement and an analog filter arrangement. The LNA-mixer arrangement receives a plurality of input signals and provides a wide-band input match for a specified frequency range of operation. The LNA-mixer arrangement includes a plurality of LNA structures and a plurality of mixer structures where each of the LNA structure path is coupled to a single mixer structure. The LNA-mixer arrangement outputs a first signal. The current buffer arrangement receives the first signal and reduces the Image Rejection (IR) asymmetry between the high frequency portion and the low frequency portion of the first signal as well as provides a gain to the first signal. The current buffer arrangement outputs a second signal. The analog filter arrangement receives the second signals and perform filtering and calibration. | 02-25-2016 |
| 20160105159 | CONFIGURABLE RADIO FREQUENCY ATTENUATOR - RF attenuator circuitry includes an RF attenuator and a control system. The RF attenuator is configured to provide an attenuation response between an input node and an output node. The control system is coupled to the RF attenuator and configured to adjust one or more control signals provided to the RF attenuator based on either the temperature of the circuitry or an externally applied test signal provided to the control system. The control signals are provided such that the attenuation response of the RF attenuator is substantially linear-in-dB with respect to either the temperature or the test signal provided to the control system. Because the control system is configured to adjust the control signals based either on a temperature of the circuitry or the test signal, the response of the RF attenuator can be easily and quickly tested to ensure linear-in-dB operation thereof. | 04-14-2016 |
| 20160173146 | APPARATUS AND METHOD FOR CONTROLLING GAIN IN COMMUNICATION SYSTEM | 06-16-2016 |
