| Entries |
| Document | Title | Date |
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| 20080207157 | Low Intermediate Frequency Receiver and the Same Method Thereof - The present invention provides a low intermediate frequency receiver for receiving radio frequency signal and provides the sampling method thereof. The low intermediate frequency receiver firstly samples the radio frequency signal so as to convert it into digital signal of non-zero frequency domain. Secondly it compensates the digital signal of non-zero frequency domain to filter out the interfering signal therein. Finally, the compensated digital signal is frequency-shifted to the zero frequency domain. By using the low intermediate frequency receiver and the sampling method thereof according to the present invention, the interference at the zero frequency, like DC drift and intermodulation component, could be easily filtered out without imposing any great influence on the useful signals. | 08-28-2008 |
| 20080207158 | TERMINAL APPARATUS - A low cost, a low power consumption and a small size are three very important factors for a mobile communication terminal. A great problem is posed by the conventional technique using a DSP and a CPU independent of each other which requires two external memory systems. Also, two peripheral units are required for data input and output of the DSP and CPU. As a result, an extraneous communication overhead occurs between the DSP and the CPU. The invention realizes a mobile communication terminal system by a DSP/CPU integrated chip comprising a DSP/CPU core ( | 08-28-2008 |
| 20080233914 | METHOD AND APPARATUS FOR FREQUENCY SYNTHESIZING - A method and an apparatus for frequency synthesizing are provided for a wireless communication system. In a frequency synthesizer, a phase lock loop (PLL) circuit generates a first elemental frequency based on a reference frequency and a unity frequency. A first division module then divides the first elemental frequency to generate a second elemental frequency. A second division module divides the second elemental frequency a multiple of times to generate the unity frequency and a plurality of intermediate frequencies each having an exponential ratio to the unity frequency by a power of two. A second mixer is provided to mix one of the intermediate frequencies with the unity frequency to generate a step frequency, and a first mixer mixes the step frequency with one of the first and second elemental frequencies to generate an output frequency having a variety covering all frequency bands in an Ultra-Wide-Band (UWB) spectrum. | 09-25-2008 |
| 20080254758 | FREQUENCY CONVERTER CIRCUIT AND RECEIVER - A frequency converter circuit includes a frequency conversion section for converting an inputted radio frequency voltage signal to a radio frequency current signal, converting the frequency of the signal to a low frequency current signal, and then outputting the low frequency current signal from an output section thereof; an amplifier including an input section connected to the output section of the frequency conversion section, and an input resistor for providing as an input impedance; and a capacitor wherein one terminal is connected to the input section of the amplifier and the other terminal is AC-grounded. With this structure, the electricity consumption can be reduced without deteriorating the SNR. | 10-16-2008 |
| 20080318544 | Frequency mixer - A mixer for mixing first and second input signals having first and second frequencies respectively. A voltage-to-current converter is coupled with an input for converting a first input signal into a current signal. A multiplier circuit is coupled with the voltage-to-current converter for multiplying the current signal with a second input signal to form an output signal at an output. A matching circuit is provided that couples a component of the current signal back to the input. The matching circuit can comprise a feedback resistor for feeding a part of the current signal back to the input. The second input signal is received at a second input coupled to a second voltage-to-current converter for converting a second input signal into a second current signal. In one embodiment of the mixer the second input is a local oscillator and the current signal is multiplied with a local oscillator signal to form an output signal at the output. | 12-25-2008 |
| 20090004993 | Rotating harmonic rejection mixer - In one embodiment, the present invention includes a mixer circuit to receive and generate a mixed signal from a radio frequency (RF) signal and a master clock signal, a switch stage coupled to an output of the mixer circuit to rotatingly switch the mixed signal to multiple gain stages coupled to the switch stage, and a combiner to combine an output of the gain stages. | 01-01-2009 |
| 20090004994 | Method and apparatus for controlling a harmonic rejection mixer - In one embodiment, the present invention includes a method for receiving a radio frequency (RF) signal and mixing the RF signal with a master clock to obtain a mixed signal, cyclically rotating the mixed signal to each of N gain stages for at least one cycle of the master clock, and summing the outputs of the N gain stages to provide an output signal. | 01-01-2009 |
| 20090023414 | Software-Defined Radio Support in Sequestered Partitions - A software-defined radio (SDR) capability may be provided in a general purpose, many core processing system by sequestering one or more partitions running on one or more cores and instantiating a communications capability by having discrete SDR functions performed by the sequestered partitions. Each SDR module embodied in a sequestered partition may be independently upgraded without modifying the hardware of the underlying processing system. By executing SDR modules in cores not accessible by application programs and/or an operating system (OS), a better Quality of Service (QoS) may be provided for wireless communications on the general purpose, multi-core processing system. An embodiment comprises isolating a core of a many core processing system as a sequestered partition, loading a software-defined radio module onto the core, and executing the software-defined module to implement wireless communications. | 01-22-2009 |
| 20090061810 | Frequency Multiplier Device - A frequency multiplier device comprises a first signal combiner having a first port for receiving a first input signal having a first frequency f | 03-05-2009 |
| 20090061811 | MULTI-FREQUENCY SYNTHESIZING APPARATUS AND METHOD FOR MULTI-BAND RF RECEIVER - A frequency synthesizing apparatus and method for a multi-band radio frequency (RF) receiver is provided. The frequency synthesizing apparatus includes a simple circuit configuration with a single SSB mixer and thus, may synthesize six high frequency signals. Signals to be inputted into the SSB mixer include a first signal and a second signal. The first signal is generated based on a VCO and a PPF. Also, the second signal is selected from a plurality of frequency divided signals which are generated by dividing a signal generated in the VCO via a plurality of dividers. | 03-05-2009 |
| 20090081984 | METHOD AND APPARATUS FOR SPUR REDUCTION IN A FREQUENCY SYNTHESIZER - A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit, a loop filter, a controlled oscillator that generates an output signal at an output, and a loop divide circuit; a non-linear circuit element at an input of the phase detector circuit, which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller controlling the loop divide circuit and the non-linear circuit element. The frequency synthesizer further includes a dither circuit that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller to the non-linear circuit element, thereby, providing a jittered reference signal to the non-linear circuit element for attenuating the at least one spurious signal at the output. | 03-26-2009 |
| 20090104887 | Log-antilog mixer circuit and method for producing frequency conversion - According to one exemplary embodiment, a method for producing frequency conversion of a communication signal comprises performing a logarithmic transformation of the communication signal to form a logarithmically transformed communication signal, adding the logarithmically transformed communication signal to a logarithmic local oscillator signal, to form a sum signal, and performing an anti-logarithmic transformation of the sum signal. In one embodiment, the method may be used to down-convert a reception signal to baseband. In one embodiment, a log-antilog mixer circuit for producing frequency conversion of a communication signal comprises a signal log block configured to receive the communication signal as an input and to provide a logarithmically transformed communication signal as an output, and an antilog block configured to receive a sum signal of the logarithmically transformed communication signal and a logarithmic local oscillator signal. | 04-23-2009 |
| 20090111419 | DIRECT CONVERSION WITH VARIABLE AMPLITUDE LO SIGNALS - Techniques to reduce LO leakage by controlling the amplitude of LO signal based on the level of output signal after the frequency conversion process. An LO generator receives a VCO signal and generates an LO signal having a variable amplitude and a frequency that is related to the frequency of the VCO signal. A variable gain amplifier receives a control signal and adjusts the amplitude of the LO signal based on the control signal. The variable amplitude LO signal is used for frequency upconversion (e.g., direction upconversion) of an input signal (e.g., at baseband) to obtain an output signal (e.g., at RF). The relationship between LO signal amplitude and output signal level may be defined by a particular transfer function. In general, the LO signal is set higher for higher output signal level and is reduced proportionally for lower output signal level. | 04-30-2009 |
| 20090131008 | RECEIVER COMPRISING A RADIOFREQUENCY SPLITTER - A receiver comprises a radio frequency splitter (SPL) and respective tuning elements (D | 05-21-2009 |
| 20090149149 | Dual Gilbert Cell Mixer with Offset Cancellation - An electronic device includes a first mixer portion having a first stage and a second stage, and a second mixer portion having a first stage and a second stage. A first electrical path is coupled to the first mixer portion and the second mixer portion, and a second electrical path is coupled to the first mixer portion and the second mixer portion. The first mixer portion is adapted to receive a first input signal on the first stage and a second input signal on the second stage. The second mixer portion is adapted to receive the second input signal on the first stage and the first input signal on the second stage. | 06-11-2009 |
| 20090156156 | GILBERT MIXERS WITH IMPROVED ISOLATION - The employment of cascading in connection with improving mixer isolation in a Gilbert mixer circuit. In this vein, there is broadly contemplated herein, inter alia, the provision of a mixer suitable for use in a direct-conversion radio receiver operating in the 57-64 GHz industrial, scientific, and medical (ISM) band. Such a receiver may be integrated along with a transmitter entirely on a silicon integrated circuit and can be used to receive and transmit data signals in such applications as wireless personal-area networks (WPANs). Numerous other applications, of course, are available for a mixer with improved LO-to-RF isolation, particularly at millimeter-wave frequencies where high LO-to-RF isolation is difficult to achieve. | 06-18-2009 |
| 20090197560 | RF TRANSMITTER AND INTEGRATED CIRCUIT WITH PROGRAMMABLE FILTER MODULE AND METHODS FOR USE THEREWITH - A radio frequency (RF) transmitter includes a transmitter processing module that generates a processed signal based on outbound data, wherein the processed signal includes one of: a baseband signal and a low intermediate frequency signal. An up-conversion module up-converts the processed signal to generate an up-converted signal. A programmable filter module generates a plurality of delayed signals from the up-converted signal and that generates a filtered up-converted signal by combining the up-converted signal and the plurality of delayed signals, wherein a delayed signal of the plurality of delayed signals is scaled based on one of a plurality of coefficients, wherein the plurality of coefficients are selected based on a control signal. A radio transmitter front-end generates a transmit signal based on the filtered up-converted signal. A processing module generates the control signal to attenuate at least RF spur of the up-converted signal. | 08-06-2009 |
| 20090209222 | Conversion Architecture For Residual Spur Avoidance - A method and apparatus for residual spur avoidance is disclosed. One embodiment comprises a method of generating a first local oscillator signal, mixing the first local oscillator signal with a radio frequency signal to generate an intermediate frequency signal, filtering the intermediate frequency signal at a band-pass frequency, mixing the filtered intermediate frequency signal with a second local oscillator signal having a first frequency offset from the band-pass frequency to generate an output intermediate frequency signal, and switching the second local oscillator signal to a second frequency offset to avoid a spur generated from the first frequency offset, wherein the second frequency offset is the opposite sign but same magnitude offset from the band-pass frequency. | 08-20-2009 |
| 20090233570 | RECEIVER FRONT-END WITH LOW POWER CONSUMPTION - A receiver includes a mixer with a first input, a second input and one output. An input signal (S | 09-17-2009 |
| 20090247109 | METHOD AND SYSTEM FOR COMMUNICATING VIA A FREQUENCY SHIFTING REPEATER - Aspects of a method and system for communicating via a frequency shifting repeater are provided. In this regard, a signal having a first frequency may be received, the received signal may be quadrature down-converted by mixing it with a pair of phase-quadrature local oscillator (LO) signals, the down-converted signals may be up-converted by mixing them with the LO signals, and the up-converted signals may be added or subtracted to generate a signal, having a second frequency, for transmission. In this manner, a wireless communication range may be extended by repeating the received signal on a different frequency than at which it was received. The frequency of the LO signals may be based on a desired difference between the first and second frequencies, a frequency at which a target device receives signals, and/or noise present. | 10-01-2009 |
| 20090270061 | SAMPLING MIXER AND RECEIVER - It is an object of the present invention to provide a sampling mixer and a receiver, capable of optimizing a sampling rate of an output signal in response to a fractional band of a modulation band with respect to an RF frequency of the received signal. A sampling mixer of the present invention, includes a history capacitor | 10-29-2009 |
| 20090270062 | Passive Miser and Four-Phase Clocking Method and Apparatus - According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer includes a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a first set of clock signals and a second set of clock signals. The first set of clock signals has a frequency twice that of the second set of clock signals. The first set of clock signals is arranged to drive the mixer input switch transistors and the second set of clock signals is arranged to drive the output switch transistors. | 10-29-2009 |
| 20090280768 | Method And System For Inter IC Communications Utilizing A Spatial Multi-Link Repeater - Aspects of a method and system for inter integrated circuit (IC) communications utilizing a spatial multilink repeater are provided. In this regard, one or more circuits in an integrated circuit may be enabled to receive a signal and repeat the received signal to a plurality of target integrated circuits. The repeated signals may be generated by frequency shifting the received signal and a different frequency shift may be utilized for each of the repeated signals. In this regard, each of the repeated signals may be generated by quadrature down-converting the received signal by mixing it with a first local oscillator pair, up-converting the down-converted signal by mixing it with a second local oscillator pair, and adding or subtracting an in-phase portion of the up-converted signal with a quadrature-phase portion of the up-converted signal. | 11-12-2009 |
| 20090286501 | Apparatus method and computer program for configurable radio-frequency front end filtering - A radio use case is determined for concurrently operating radios of a multi-radio device and/or transmitter and receiver of a FDD radio. A local memory is accessed with the determined use case to find a high and/or a low frequency cutoff for the concurrent operation radio or transmitter/receiver. Control signals are applied to impose the high and/or the low frequency cutoff to a pair of frequency adjustable diplexers that are in series with one another in one of a transmit branch or a receive branch of a duplexer circuit that is disposed between the radio and an antenna. Then, a receive signal is passed through the antenna and the receive branch of the duplexer circuit to the radio or receiver of the FDD radio, or a transmit signal is passed from the respective radio or transmitter of the FDD radio through the transmit branch of the duplexer circuit to the antenna. | 11-19-2009 |
| 20090298456 | RADIO WAVE RECEPTION DEVICE, RADIO WAVE CLOCK - A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal Sf | 12-03-2009 |
| 20090318105 | METHOD AND SYSTEM FOR INTRA-PRINTED CIRCUIT BOARD COMMUNICATION VIA WAVEGUIDES - Methods and systems for intra-printed circuit board communication via waveguides are disclosed and may include communicating one or more signals between or among a plurality of integrated circuits via one or more waveguides integrated on a printed circuit board. The integrated circuits may be bonded to the printed circuit board. The waveguides may be configured via switches integrated within each of the plurality of integrated circuits. The one or more signals may include microwave signals. The one or more waveguides may be configured for communicating microwave signals with a frequency of 60 GHz or greater. The communication of the one or more signals may be configured via a low frequency control signal, which may include a digital signal. The one or more waveguides may include metal and/or semiconductor layers deposited on and/or embedded within the printed circuit board. | 12-24-2009 |
| 20090318106 | METHOD AND SYSTEM FOR INTRA-CHIP WAVEGUIDE COMMUNICATION - Methods and systems for intra-chip waveguide communication are disclosed and may include configuring one or more waveguides in an integrated circuit and communicating one or more signals between blocks within the integrated circuit via the one or more waveguides. The one or more waveguides may be configured via switches in the integrated circuit by adjusting a length of the one or more waveguides. The one or more signals may include a microwave signal and a low frequency control signal that configures the microwave signal. The low frequency control signal may include a digital signal. The one or more waveguides may include metal layers deposited on the integrated circuit or within the integrated circuit. The one or more waveguides may include semiconductor layers deposited on the integrated circuit or embedded within the integrated circuit. | 12-24-2009 |
| 20090318107 | DC Offset, Re-Radiation, and I/Q Solutions Using Universal Frequency Translation Technology - Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein. | 12-24-2009 |
| 20100029238 | METHOD OF PERFORMING FREQUENCY CONVERSION AND ASSOCIATED FREQUENCY CONVERTER - A method of performing frequency conversion and associated frequency converter are provided. The method includes: receiving an input signal and a plurality of periodic ternary signals of the same frequency but different timings; generating a plurality of conversion signals using a plurality of conversion paths in response to the input signal and states of said periodic ternary signals; and summing the conversion signals to generate an output signal. | 02-04-2010 |
| 20100035571 | Up-Conversion Mixer with Signal Processing - Systems and methods for implementing an up-conversion mixer with signal processing are disclosed. | 02-11-2010 |
| 20100035572 | Down-Conversion Mixer With Signal Processing - Systems and methods for implementing a down-conversion mixer with signal processing are disclosed. | 02-11-2010 |
| 20100056094 | Noise Cancellation Circuit for a Mixer Device and Related Mixer Device - A noise cancellation circuit for a mixer device includes a first signal terminal, coupled to a first output terminal, and a second signal terminal, coupled to a second output terminal of the RF input stage of the mixer device, a first variable current source with a first end coupled to the first signal terminal, a second end coupled to the second signal terminal, and a third end coupled to a first voltage source, a second variable current source with a first end coupled to the second signal terminal, a second end coupled to the first signal terminal, and a third end coupled to the first voltage source, and a phase shift device coupled to the first signal terminal and the second end of the second variable current source, transforming a first signal into a second signal, and outputting to the second end of the second variable current source. | 03-04-2010 |
| 20100105349 | Rf signal sampling apparatus and method - The invention relates to an RF signal sampling apparatus for a wireless receiver, comprising a first transconductor circuit (Gmi), for converting received RF voltage signals into current signals, a first HR filter, for down-sampling and filtering the current signals, and an FIR filter, for further filtering, down-sampling and outputting the signals which are outputted by the first HR filter. | 04-29-2010 |
| 20100112972 | Mixer with Feedback - A method and system for increasing the compression point of a receiver by deriving a feedback signal from mixer output signals. The feedback signal prevents the receiver from going into compression on strong out-of-band or blocking signals, while enhancing the receiver gain at the desired frequency. The desired frequency coincides with the local oscillator (LO) signal and is therefore particularly applicable for, but not limited to, homodyne receivers where selectivity can be made quite narrowband. Since the selectivity is coupled to the LO, a tunable receiver may be achieved that enables selectivity over a wide range of input frequencies. | 05-06-2010 |
| 20100130157 | RF ISOLATION OF LOW COST SWITCH USING SHUNT DIODE - The method and apparatus according to the present invention teaches a way to employ a pair of inexpensive switch IC's by improving isolation using a tuned diode shunt on the potential leakage path that exists between the two inputs when the IRD is in the legacy LNB Mode. In particular, the present invention teaches a method and apparatus of providing a signal path between a first input and a second signal processor. The second signal processor can further be coupled to a second input. When the second processor is coupled to the second input, the signal path is decoupled from the second processor and coupled to ground using a pin diode. | 05-27-2010 |
| 20100233987 | IMPLEMENTING A ROTATING HARMONIC REJECTION MIXER (RHRM) FOR A TV TUNER IN AN INTEGRATED CIRCUIT - In one embodiment, an apparatus includes mixer stages each coupled to receive a radio frequency (RF) signal from a corresponding tracking filter each configured for a band of frequencies. Each mixer stage is controllable to mix the RF signal with a divided master clock signal to obtain N multi-phase intermediate frequency (IF) signals, where N is programmable based upon a desired channel frequency. A load network having individual loads to be shared by the mixers can be coupled to the mixer stages, and a shared IF combiner may be coupled to the load network to weight and combine outputs of the load network to obtain a quadrature IF signal. The load network can include multiple loads each to be individually controlled to receive one of the multi-phase IF signals. | 09-16-2010 |
| 20100240335 | Rotating Harmonic Rejection Mixer - In one embodiment, the present invention includes a mixer circuit to receive and generate a mixed signal from a radio frequency (RF) signal and a master clock signal, a switch stage coupled to an output of the mixer circuit to rotatingly switch the mixed signal to multiple gain stages coupled to the switch stage, and a combiner to combine an output of the gain stages. | 09-23-2010 |
| 20110003574 | Constant Output DC Bias Circuit Using an Open Loop Scheme - Embodiments of the present invention provide constant output DC biasing circuits. Embodiments employ an open loop scheme, instead of a closed loop scheme as used in conventional circuits. In addition, embodiments generate a DC bias voltage that is independent of temperature, process, and power supply variations. Further, embodiments require low amounts of power and silicon. | 01-06-2011 |
| 20110065411 | Method And Apparatus For Controlling A Harmonic Rejection Mixer - In one embodiment, the present invention includes a method for receiving a radio frequency (RF) signal and mixing the RF signal with a master clock to obtain a mixed signal, cyclically rotating the mixed signal to each of N gain stages for at least one cycle of the master clock, and summing the outputs of the N gain stages to provide an output signal. | 03-17-2011 |
| 20110086606 | ADAPTIVE RECEIVERS - An adaptive receiver for receiving a radio frequency (RF) signal and converting the RF signal at an RF frequency F | 04-14-2011 |
| 20110092177 | Down-Conversion of an Electromagnetic Signal with Feedback Control - Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein. | 04-21-2011 |
| 20110105072 | DUAL INDUCTOR CIRCUIT FOR MULTI-BAND WIRELESS COMMUNICATION DEVICE - This disclosure describes a dual inductor circuit, which may be particularly useful in a mixer of a wireless communication device to allow the mixer to operate for two different frequency bands or in a multi-differential branch low noise amplifier wherein each of the differential branches possess a different set of gain and linearity characteristics for a signal operating at the same frequency. The dual inductor circuit comprises an inductor-within-inductor design in which a small inductor is disposed within a large inductor. The two inductors may share a ground terminal, but are otherwise physically separated and independent from one another. Terminals of the inner inductor, for example, are not tapped from the outer inductor, which can reduce parasitic effects and electromagnetic interference relative to tapped inductor designs. The independence of the inductors also allows the different inductors to define different resonance frequencies or gain and linearity characteristics, which is desirable. | 05-05-2011 |
| 20110159835 | CRYSTAL-LESS CLOCK GENERATION FOR RADIO FREQUENCY RECEIVERS - Systems and methods of clock generation for radio frequency receiver. In radio frequency receiver, the system requires accurate local oscillating (LO) signal and system clocks for proper operation and to ensure high quality performance. In order to achieve accurate LO frequency and system clock, a crystal or and accurate reference clock is provide to the clock generation circuit. How a low-cost receiver, it is desirable to eliminate the requirement for a crystal or an accurate reference clock. The present invention discloses systems and methods to utilize a pilot signal embedded in the transmitted signal. The pilot signal usually has very accurate frequency which is particular true for broadcast system such as FM broadcast. In various embodiments of the present invention, the systems and methods measure the relation between the frequency of the pilot signal and the current clock generated. The measured result is compared with a know relation corresponding to the frequency of the pilot signal and the target clock signal and the result is used to adjust the clock generation circuit. | 06-30-2011 |
| 20110294454 | PROGRAMMABLE FILTER - The invention relates to a programmable filter for a radiofrequency receiver, embodiments disclosed including a filter ( | 12-01-2011 |
| 20110300823 | IMAGE REJECTION MIXER AND WIRELESS COMMUNICATION DEVICE - An image rejection mixer and a communication device, which may suppress unwanted frequency components of a high power output assuming a fourth-order harmonic mixer. The image rejection mixer and communication device include first and second fourth-order harmonic mixers, a 90-degree IF synthesis distributor, a 90-degree LO distributor, and a 90-degree RF synthesis distributor. Use of the 90-degree distributors for LO distribution of the fourth-order harmonic image rejection mixer suppresses the unwanted frequency components of the high power output. | 12-08-2011 |
| 20120178398 | APPLICATIONS OF UNIVERSAL FREQUENCY TRANSLATION - Frequency translation and applications of same are described herein. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and filtering, and combinations and applications of same. | 07-12-2012 |
| 20130130638 | METHODS OF RECEIVING AND RECEIVERS - Data is received that has been transmitted via a combination of radio frequency signals using carrier aggregation, each radio frequency signal occupying a respective radio frequency band, the bands being arranged in two groups separated in frequency by a first frequency region, the first of the two groups occupying a wider frequency region than the second group. Inphase and quadrature components of the radio frequency signals are filtered using a first bandpass filter bandwidth to give first bandpass filtered components and filtered using a second bandpass filter bandwidth, different from the first bandpass filter bandwidth, to give second bandpass filtered components. A reconfigurable receiver is configurable to a first mode to receive the combination of radio frequency signals, and is also configurable to at least a second mode. At least one first filter is configured, in the first mode, to use a first bandpass filter bandwidth and, in the second mode, to use a lowpass filter bandwidth. At least one second filter is configured, in the first mode, to use a second bandpass filter bandwidth, different from the first bandpass filter bandwidth. | 05-23-2013 |
| 20130178182 | System for Processing Composite Wideband Signals - According to one exemplary embodiment, a front-end system for processing a composite wideband signal comprises a pre-receiving unit including a multiplexer for separating the composite wideband signal into a plurality of filtered signals. The front-end system further comprises a plurality of discrete frequency band outputs corresponding to the plurality of filtered signals, and a tuner/down-converter coupled to at least one of the plurality of discrete frequency band outputs. In one embodiment, the pre-receiving unit of the front-end system further comprises a second multiplexer for separating at least one of the plurality of filtered signals into a second plurality of filtered signals. In one embodiment, the pre-receiving unit may further comprise a low noise amplifier for processing at least one of the plurality of filtered signals before it is input to the second multiplexer. | 07-11-2013 |
| 20140057585 | FREQUENCY CONVERTER - A frequency converter includes: a plurality of mixers each including a magnetoresistance effect device including a fixed magnetic layer, a free magnetic layer, and a nonmagnetic spacer layer sandwiched between the fixed magnetic layer and the free magnetic layer, when receiving a first high-frequency signal and a local second high-frequency signal, the magnetoresistance effect device multiplying the first high-frequency signal and the local second high-frequency signal by a magnetoresistance effect to generate a multiplication signal, and a magnetic field applying unit that applies a magnetic field to the free magnetic layer. A plurality of multiplication signals generated when the first high-frequency signal and the local second high-frequency signals that differ from one mixer to another are input to the mixers, are added together and are output. | 02-27-2014 |
| 20140128016 | SYSTEMS AND METHODS FOR ASYNCHRONOUS RE-MODULATION WITH ADAPTIVE I/Q ADJUSTMENT - Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I″) signal and a quadrature (“Q″) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator. | 05-08-2014 |
| 20140171008 | Calibration - Techniques are described for calibration of a frequency converter for reducing a leakage-based direct current component at an output of the frequency converter. In an apparatus comprising a frequency converter arranged to perform frequency conversion on an input signal, a variable load arranged to act on at least one of an input and an output of the frequency converter, and a detector arranged to detect a direct current component of an output signal of the frequency converter, a plurality of states of the variable load are sequentially set, a variation between the direct current components for each one of the plurality of states of the variable load is observed, and at least one parameter influencing the direct current component of the output signal of the frequency converter is adjusted such that the observed variation is reduced. | 06-19-2014 |
| 20150318825 | Harmonic Reject Receiver Architecture and Mixer - Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection. | 11-05-2015 |
| 20160112146 | CIRCUIT PROVIDING HARMONIC RESPONSE REJECTION FOR A FREQUENCY MIXER - An apparatus for reducing a harmonic response in an electronic circuit is provided. The apparatus includes an RF input configured to provide a first signal operating at a radio frequency. The apparatus includes a local oscillator configured to produce a second signal operating at a local oscillator (LO) frequency. The apparatus includes a switching mixer configured to mix the first and second signals. The apparatus includes a notch filter comprising an inductor and a capacitor connected in parallel. The notch filter is directly coupled to an input of the switching mixer in series. The notch filter is tuned such that its resonant frequency is a harmonic of the LO frequency signal. In an aspect, the apparatus also includes a transformer configured to provide the first signal. In an aspect the apparatus also includes a second notch filter comprising a second inductor and a second capacitor connected in parallel. | 04-21-2016 |
