| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 455126000 | With feedback of modulated output signal | 25 |
| 20080233904 | TIMING ADJUSTMENT METHOD FOR WIRELESS COMMUNICATION APPARATUS - A wireless communication device including: a transmitter including two DA converter units which convert two digital signals into analog signals; a combiner which combines the analog signals; a distributor which extracts a portion of the combined signal as a feedback signal; an AD converter which converts the feedback signal; an oscillator unit which supplies clock signals to operate the DA converter units and the AD converter; a first separation unit which separates the feedback signal converted by the AD converter into two signals; and a comparator unit which compares at least one of the two digital signals that are obtained by separating the inputted digital signal, or, at least one of the two digital signals that are separately inputted, with the feedback signal separated by the first separation unit, wherein the oscillator unit controls the output clock signals based on a result of the comparison by the comparator unit. | 09-25-2008 |
| 20080242245 | REJECTION OF TRANSMIT SIGNAL LEAKAGE IN WIRELESS COMMUNICATION DEVICE - This disclosure describes techniques for reducing adverse effects of transmit signal leakage in a full-duplex, wireless communication system. The disclosure describes techniques for reducing adverse effects of second order distortion and cross-modulation distortion of transmit signal leakage from a transmitter via a duplexer. The techniques may be effective in rejecting at least a portion of a transmit leakage signal, thereby reducing or eliminating distortion. The adaptive filter may include an estimator circuit that generates a transmit leakage signal estimate. A summer subtracts the estimate from the received signal to cancel transmit leakage and produce an output signal. The estimator circuit generates the transmit leakage signal estimate based on a reference signal and feedback from the output signal. The reference signal approximates the carrier signal used to generate the transmit signal in the transmitter. The reference signal may be provided by the same oscillator used to produce the transmit carrier signal. | 10-02-2008 |
| 20080280573 | Linear RF amplifier with polar feedback - A system for power amplification of an RF signal including polar feedback control. The system may include a feedback-controlled modulator configured to modulate an RF signal based on a feedback-corrected control signal. The modulator is further configured to generate a modulated RF signal. The system also may include a phase shifter configured to correct the phase of the modulated RF signal based on a feedback phase control signal. The system further includes a power amplifier in communication with the modulator and/or the phase shifter. The amplifier is configured to amplify the modulated RF signal and to generate an amplified RF output signal. The system also includes a feedback network configured to generate polar feedback signals, including the feedback-corrected control signal and/or the feedback phase control signal. | 11-13-2008 |
| 20080280574 | RF transmitter with adjustable antenna assembly - A radio frequency (RF) transmitter includes a baseband processing module, an up conversion module, a power amplifier module, and an antenna assembly. The baseband processing module is coupled to convert outbound data into a first outbound symbol stream and a second outbound symbol stream and to generate an adjust signal. The up conversion module is coupled to convert the first outbound symbol stream into a first up converted signal and to convert the second outbound symbol stream into a second up converted signal. The power amplifier module is coupled to amplify the first and second up converted signals to produce first and second outbound RF signals. The antenna assembly is coupled to transmit the first and second outbound RF signals, wherein the antenna assembly adjusts at least one of amplitude and phase of at least one of the first and second outbound RF signals based on the adjust signal. | 11-13-2008 |
| 20080287077 | Method and apparatus for cartesian error feedback - A method of reducing distortion in the output of an amplifier is provided. The method comprises subtractively combining baseband error signals with the appropriate phase shift with baseband input signals, the baseband error signals generated by subtractively combining delayed fed-forward portions of the baseband input signals with baseband converted portions of a fed-back amplified output signal, the amplified output signal being a distorted replica of combined up-converted baseband input signals. The baseband error signals being filtered prior to the combining function, and also providing inputs to a controller which adjusts active elements of the amplification and fed-back paths in order to minimize the distortion within the output of the amplifier. | 11-20-2008 |
| 20080299922 | METHOD AND APPARATUS FOR PROVIDING A CARTESIAN TRAINING WAVEFORM - One provides ( | 12-04-2008 |
| 20090036070 | Multiple die integrated circuit assembly - An integrated circuit (IC) includes a first die, a second die, a packaging substrate, and coupling circuit. The first die includes first circuitry and the second die includes second circuitry. The packaging substrate supports the first and second dies, wherein the first and second dies are stacked with respect to the packaging substrate. The coupling circuit couples the first die to the second die, wherein the first and second circuitry communicate via the coupling circuit. | 02-05-2009 |
| 20090042521 | RADIO TRANSMITTER USING CARTESIAN LOOP - A radio transmitter including a combiner which combines input I/Q signals with feedback I/Q signals, a power amplifier which amplifies the quadrature modulated signal, a detector which detects amplitude and phase differences between the input and feedback I/Q signals, a switch to turn on and off the feedback I/Q signals, a generator to generate control signals which minimizes the amplitude difference and the phase difference, in a state where a transmission power is set, during for a period during which the switch is turned off, an amplitude adjuster which adjusts an amplitude of the feedback RF signal, during a period during which the switch is turned on, and a phase adjuster which adjusts a phase of the local signal, during the period during which the switch is turned on. | 02-12-2009 |
| 20090054018 | System And Method For Power Control In A Wireless Transmitter - A system and method for power control in a wireless transmitter. A power control loop includes a feed forward unit coupled to a data source, the feed forward unit processes a signal for transmission, a feedback unit coupled to the feed forward unit, the feedback unit generates a feedback signal representative of an output power level of the signal transmitted by the feed forward unit, a closed loop power control unit coupled to the feedback unit and to the feed forward unit, the closed loop power control unit generates an additive correction signal based on an error signal computed from the feedback signal and data provided by the data source or software instructions, and a ramp path power control unit coupled to the data source, the ramp path power control unit generates a multiplicative correction signal based on an additive correction signal and data provided by the data source. | 02-26-2009 |
| 20090093223 | METHODS AND APPARATUS FOR REDUCING RADIATED FIELD FEEDBACK IN RADIO FREQUENCY TRANSMITTERS - Methods and apparatus for reducing radiated field feedback in radio frequency (RF) transmitters. An exemplary RF transmitter includes a power amplifier (PA) and a low-field oscillator (LFO) that are co-located, either on a common module or integrated in the same integrated circuit chip. By using an LFO for the transmitter's local oscillator, radiated field feedback from the PA to the LFO is substantially reduced. In addition to, or instead of using an LFO to reduce radiated field feedback, the LFO or a voltage controlled oscillator (VCO) may be configured to operate at either a harmonic or a non-integer multiple of the transmitter's output signal frequency. Using an LFO or VCO and/or operating the oscillator at a harmonic or a non-integer multiple of the radio system output signal frequency reduces the degree by which electromagnetic fields generated by the radio system's PA and antenna interfere with electromagnetic fields generated by the LFO or VCO, thereby allowing the LFO or VCO to be co-located with or integrated in the same integrated circuit chip as the radio system's PA. | 04-09-2009 |
| 20090093224 | Translational loop transmitter architecture employing channel power ratio measurements for modulation accuracy calibration - A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at the translational loop output. The RF transmitter includes an Intermediate Frequency (IF) modulator, a translational loop, an envelope time delay adjust block, an envelope adjust block, and a time delay calibration block. The IF modulator receives a modulated baseband signal and produces a modulated IF signal having a non-constant envelope. The translational loop receives the modulated IF signal and produces a modulated RF signal having a constant envelope. The envelope time delay adjust block receives an envelope signal corresponding to the original modulated signal and produces a time delayed envelope signal based upon a time delay control signal. The envelope adjust block adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal. Finally, the time delay calibration block receives the envelope adjusted modulated RF signal and produces the time delay control signal. | 04-09-2009 |
| 20090137217 | Communication transmission system and power detection method thereof - A communication transmission system is applied to an application device and includes a power detection circuit, and a radio frequency module. The power detection circuit is used for detecting the power on the output port of the communication transmission system, and for producing a feedback signal. The radio frequency module is connected to the power detection circuit for receiving the feedback signal so as to adjust its output power. In addition, the power detection circuit is built to be independent of the RF module for directly detecting the power on the output port of the communication transmission system which represents the actual power of the application device, thereby achieving the purpose of outputting a more stable and accurate output power through the RF module. | 05-28-2009 |
| 20090325516 | System and Method for IQ Imbalance Estimation Using Loopback with Frequency Offset - Systems and methods for estimating IQ imbalance in a communication system are provided. In various embodiments, a device is configured to perform a self-characterization. The self-characterization is performed over an RF loopback circuit. In some embodiments, a probe is transmitted over the RF loopback circuit. The probe uses a frequency offset such that an image related to one IQ imbalance is separated from an image related to another IQ imbalance. An imbalance estimate is calculated based on processing of the probe. | 12-31-2009 |
| 20100093290 | Multi-dimensional volterra series transmitter linearization - A radio transmission system comprising a plurality of Volterra Engine (VE) linearizers; a power amplifier (PA) coupled to the VE linearizers; a feedback circuitry coupled to the VE linearizers and the PA; and at least one adaptive controller coupled to the feedback circuitry, wherein each VE linearizer is coupled to at least another VE linearizer in series, in parallel, or both, and is configured to compensate for at least one distortion aspect of an output signal from the PA. | 04-15-2010 |
| 20100105343 | SYSTEMS AND METHODS FOR ADJUSTING HEADROOM OF A POWER AMPLIFIER - Systems and methods are provided for controlling headroom of an amplifier (e.g., in a transmitter). A method comprises obtaining a target output power for a current interval and obtaining a target headroom for a subsequent interval. The method continues by adjusting, during the current interval, the power output capability of the amplifier based on the target headroom and adjusting the input power of an input signal based on the target output power, such that the output power of the amplifier is substantially constant during the current interval as the power output capability of the amplifier is adjusted. | 04-29-2010 |
| 20100120384 | METHODS AND APPARATUS FOR DYNAMICALLY COMPENSATING FOR DC OFFSET DRIFT AND OTHER PVT-RELATED SIGNAL VARIATIONS IN POLAR TRANSMITTERS - Methods and apparatus for dynamically compensating for signal variations in communications transmitters employing switch-mode PAs. An exemplary method includes first identifying a predetermined signal characteristic in an input signal applied to an input of a switch-mode PA. A modulated signal produced at the output of the switch-mode PA containing the identified signal characteristic is then sampled at approximately the same time the identified signal characteristic appears at the output of the switch-mode PA, to generate a digital sample representing an actual value of the identified signal characteristic. An error signal representing the extent to which the actual value deviates from an expected value is then generated. Finally, the DC level and/or gain of the input signal to the switch-mode PA is modified to reduce the error. By reducing the error in this manner, signal variations that adversely affect the accuracy of the switch-mode PA output signal are dynamically compensated for. | 05-13-2010 |
| 20100136933 | CONFIGURATION CONTROLLER FOR RECEIVER AND TRANSMITTER - A configuration controller generates one or more control signals based on channel data. A receiver includes an RF receiver section and a receiver processing module that are configured in response to the control signal. A transmitter includes an RF transmitter section and a transmitter processing module that are configured in response to the control signal. | 06-03-2010 |
| 20110076969 | Gating Control Loop - The present invention is about tuning the gating scheme according to the performance of the application used. This can mean that in some situations gating is not used at all while in other occasions gating is used where the cycle length, burst length, number of preambles and offset are adjusted. The performance is monitored and the gating is increased or decreased depending on the results of the monitoring and demands of the application. Furthermore, the gating scheme adapts to the current performance and is chosen to optimize performance in terms of system capacity. The monitoring also takes into account which of the gating cycles that needs to be changed. The algorithm is self tuning/configuring meaning that it will control the gating scheme to find and keep an optimal level for the used application. The method may be implemented both in a mobile terminal (UE) and in an infrastructure node (BS) and executed by instruction sets belonging to a computer program. | 03-31-2011 |
| 20110201287 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR - A wireless communication unit comprises a transmitter having a forward path comprising a power amplifier, PA, and a feedback path arranged to feed back a portion of a signal output from the PA to a point in the forward path prior to the PA. The forward path and feedback path form a constant gain tracking (CGT) loop. The feedback path comprises an adaptive predistortion logic module located outside of the CGT loop and arranged to form an APD loop with the forward path and feedback path. The CGT loop comprises a controller logic module arranged to determine a gain offset of a signal routed through the forward path and feedback path and in response thereto set a drive level of the PA. | 08-18-2011 |
| 20110294446 | Gyrator circuit, wide-band amplifier and radio communication apparatus - Disclosed herein is a gyrator circuit, including, a first transconductance amplifier, a capacitor, and a second transconductance amplifier, wherein the differential input terminals of the first transconductance amplifier and the differential output terminals of the second transconductance amplifier being separated from each other. | 12-01-2011 |
| 20120071118 | DATA CONVERSION USING A SERIAL INTERFACE CLOCK IN A POWER AMPLIFIER MODULE - In a mobile wireless telecommunication device, a bidirectional serial interface is used to transfer a digital representation of an analog value from a first chip associated with a power amplifier module to a second chip. In an exemplary embodiment, circuitry on the first chip receives this clock signal from the second chip during the address portion of a read operation and uses this clock signal to generate a conversion clock signal. An analog-to-digital converter (ADC) on the first chip operates in response to the conversion clock signal to convert an analog value to a digital output. Circuitry on the first chip then transfers the digital output of the ADC from the first chip to the second chip via the serial interface. | 03-22-2012 |
| 20120122411 | IMPROVED CONTROL OF SWITCHER REGULATED POWER AMPLIFIER MODULES - Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values. | 05-17-2012 |
| 20130012147 | CONTROL OF SWITCHER REGULATED POWER AMPLIFIER MODULES - Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values. | 01-10-2013 |
| 20130059553 | ANTENNA APPARATUS, ANTENNA SYSTEM, AND METHOD OF ADJUSTING ANTENNA APPARATUS - An antenna apparatus includes: first high-frequency output means for outputting a first high-frequency signal; second high-frequency output means for outputting a second high-frequency signal having the same frequency component as that of the first high-frequency signal; first antenna means for emitting a right-hand elliptically polarized wave according to the first high-frequency signal output from the first high-frequency output means; second antenna means for emitting a left-hand elliptically polarized wave according to the second high-frequency signal output from the second high-frequency output means; and phase adjustment means for adjusting a phase of at least one of the first high-frequency signal output from the first high-frequency output means and the second high-frequency signal output from the second high-frequency output means. | 03-07-2013 |
| 20160192440 | METHODS, BASE STATION SYSTEM, RADIO UNIT AND RADIO HEAD OF A WIRELESS COMMUNICATION NETWORK, FOR INCREASING SIGNAL QUALITY OF SIGNALS SENT FROM THE RADIO HEAD TO THE RADIO UNIT - Disclosed is a method performed by a base station system of a wireless communication network, for increasing signal quality of signals sent from a radio head, RH, ( | 06-30-2016 |
