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| Number | Title | Issue Date |
| 7436900 | Intermodulation distortion identification and quantization circuit for a linear amplifier system A method and multiple carrier linear amplifier circuit reduces intermodulation distortion by sampling the multiple carrier linear amplifier radio frequency signal and detecting the sampled signal at frequency increments and quantizing and nulling the intermodulation... | 10/14/2008 |
| 7436259 | Amplification apparatus An amplification apparatus that has a distortion detection loop that detects distortion components contained in an amplified signal to be amplified that is amplified by an amplifier 3, and a distortion removal loop that removes distortion components from the ... | 10/14/2008 |
| 7369811 | System and method for sensitivity optimization of RF receiver using adaptive nulling The present invention provides sensitivity enhancement for a single antenna RFID interrogating device by separately coupling a nulling signal formed using a portion of a transmit signal into a receiver. The phase and amplitude of nulling signal can be adjusted so th... | 05/06/2008 |
| 7366252 | Wideband enhanced digital injection predistortion system and method A system for linearizing RF amplifiers employing baseband predistortion techniques provides additive or multiplicative predistortion of the quadrature (I/Q) input signal. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer character... | 04/29/2008 |
| 7356102 | Gain compensation over temperature and frequency variations in wireless transceivers Systems and methods are provided for controlling gain compensation over temperature and frequency variations. A variable amplifier may be used to receive a control signal and an input signal. The variable amplifier may be operable to apply a gain to the input signal... | 04/08/2008 |
| 7352827 | Multichannel simultaneous real time spectrum analysis with offset frequency trigger An instrumentation receiver for multichannel simultaneously realtime spectrum analysis with frequency trigger offset inputs a wideband IF signal derived from a wideband RF signal by the receiver to both a wideband IF channel and a narrowband IF channel simultaneousl... | 04/01/2008 |
| 7348843 | Predistortion linearizer using cascaded lower-order linearizers A predistortion linearizer for predistorting a radiofrequency (RF) signal includes a first third-order predistortion linearizer having an input for receiving the RF signal, and a second third-order predistortion linearizer connected in cascade with the first lineari... | 03/25/2008 |
| 7342446 | Apparatus and method for controlling feed-forward amplifiers An apparatus and method for operating a feed-forward amplifier in which, after the signal-cancellation and intermodulation-cancellation loops have initially been nulled, the feed-forward amplifier is operated so that both loops are controlled so as to minimize inter... | 03/11/2008 |
| 7342909 | CDMA transmitter, CDMA multiplex transmitter, CDMA receiver and CDMA communication system According to a CDMA communication system for the present invention, the transmission side for each channel increases the amplitude of a time slot period for self-channel synchronization until greater than the amplitude for another period, and outputs the resultant s... | 03/11/2008 |
| 7340265 | Method and apparatus for transient frequency distortion compensation Transient distortion is compensated for by multiplying an exponentially-decaying phase shift onto the distorted waveform. The exponentially decaying phase shift waveform is patterned after the transient which typically takes the form of an exponential and occurs upo... | 03/04/2008 |
| 7336725 | Digital predistortion system and method for high efficiency transmitters A system for digitally linearizing the nonlinear behaviour of RF high efficiency amplifiers employing baseband predistortion techniques is disclosed. The system provides additive or multiplicative predistortion of the digital quadrature (I/Q) input signal in order t... | 02/26/2008 |
| 7336127 | Doherty amplifier configuration for a collector controlled power amplifier An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty... | 02/26/2008 |
| 7333561 | Postdistortion amplifier with predistorted postdistortion A postdistortion amplifier that produces a postdistortion amplifier output signal based on a signal input to the postdistortion amplifier reduces distortion in the postdistortion amplifier output signal by digitally predistorting an error signal. The postdistortion ... | 02/19/2008 |
| 7330071 | High efficiency radio frequency power amplifier having an extended dynamic range A system and method are provided for efficiently amplifying a radio frequency signal. In general, the system includes power amplifier circuitry that efficiently amplifies an input signal under power back-off conditions. In one embodiment, the power amplifier circuit... | 02/12/2008 |
| 7321635 | Linearization of amplifiers using baseband detection and non-baseband pre-distortion In an amplifier system that linearizes an amplifier by pre-distorting the input signal prior to amplification, a baseband pre-distortion processor processes the input signal in a digital baseband domain to generate one or more pre-distortion parameters based on the ... | 01/22/2008 |
| 7313127 | Method and apparatus for synchronizing a radio telemetry system by way of transmitted-reference, delay-hopped ultra-wideband pilot signal A time-division-multiplexed radio communication system and method uses transmitted-reference, delay-hopped (TR/DH) ultra-wideband (UWB) broadcast signal to provide a pilot signal to all mobile devices in a coverage area from which time synchronization is derived. Us... | 12/25/2007 |
| 7313199 | Power amplifier linearization A system for linearizing the output of a high power amplifier (HPA) designed to transmit an RF modulated signal includes in its transmit section a digital up-converter for processing baseband input signals and generating a desired digital RF waveform, T(s). The desi... | 12/25/2007 |
| 7304533 | Integrated channel filter using multiple resonant filters and method of operation A circuit includes a first filter comprising a first inductor coupled to a first variable capacitor, wherein the first filter is associated with a first resonant frequency. The circuit further comprises an amplifier coupled to the first filter and a second filter co... | 12/04/2007 |
| 7301396 | System and method for distortion cancellation in amplifiers A distortion cancellation amplifier is described having a main amplifier and an error amplifier. The main amplifier, in response to an input signal, generates an output signal having an amplified signal component and a distortion signal component. The error amplifie... | 11/27/2007 |
| 7289575 | Signal processing means A non-linearity generator operates on a signal between a frequency converter and an amplifier and acts as a postdistorter for the component it follows and as a predistorter for the component it precedes, thus linearizing the overall input-output characteristic of th... | 10/30/2007 |
| 7289773 | Digital transmitter system employing self-generating predistortion parameter lists and adaptive controller A method and apparatus for digital predistortion of power amplifiers are disclosed. Successful digital predistortion parameter settings are correlated with the operating conditions that affect the distortion of an amplifier. These operating conditions may include in... | 10/30/2007 |
| 7280611 | Nonlinear distortion compensating device A nonlinear distortion compensating device splits its operation into two processes. One is a compensation & amplification process for providing a receipt signal with a distortion compensating calculation and amplification before outputting the signal with phase and ... | 10/09/2007 |
| 7280612 | Digital branch calibrator for an RF transmitter The present invention provides a digital (computational) branch calibrator which uses a feedback signal sensed from an RF transmit signal path following the combining stage of LINC circuitry of a transmitter to compensate for gain and phase imbalances occurring betw... | 10/09/2007 |
| 7271657 | Traveling wave amplifier A traveling wave amplifier comprises a first normally off MOS transistor having a drain, source and gate terminal. The drain terminal is connected to a node of a drain line, which is connected to a first supply voltage potential via a connecting resistor. The gate t... | 09/18/2007 |
| 7268619 | Amplifier pre-distorter method and apparatus An amplifier pre-distorter method and apparatus squares an input signal and splits the signal into inphase and quadrature parts which are processed to generate a polynominal predistortion signal. This simplifies the apparatus and enables implementation in an applica... | 09/11/2007 |
| 7266159 | Frequency-dependent magnitude pre-distortion on non-baseband input signals for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to a non-baseband input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion tech... | 09/04/2007 |
| 7259630 | Elimination of peak clipping and improved efficiency for RF power amplifiers with a predistorter A predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier and peak control circuit. Such an input loop includes a look-up table containing predistortion values to be applied to an... | 08/21/2007 |
| 7257381 | Self-tuned millimeter wave RF transceiver module A self-tuned millimeter wave transceiver module includes a microwave monolithic integrated circuit (MMIC) having at least one amplifier. A controller is operatively connected to the MMIC for sensing amplifier operating conditions and tuning the at least one amplifie... | 08/14/2007 |
| 7251293 | Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics An input signal is pre-distorted to reduce spurious emissions resulting from subsequent signal amplification. Frequency-dependent pre-distortion is preferably implemented in combination with frequency-independent pre-distortion, where the frequency-dependent pre-dis... | 07/31/2007 |
| 7248112 | Hybrid distortion compensation method and hybrid distortion compensation device A hybrid distortion compensation method and apparatus that greatly improves the capability to compensate for non-linear distortion due to a high frequency power amplifier over a wideband in strict conditions of smaller size and reduced power consumption. An adaptive... | 07/24/2007 |
| 7248113 | Methods and systems for stabilizing an amplifier The invention generally relates to stabilizing an amplifier. In one aspect, a stabilization module that is in electrical communication with the amplifier is provided. The stabilization module includes both an open loop control system and a closed loop control system... | 07/24/2007 |
| 7248642 | Frequency-dependent phase pre-distortion for reducing spurious emissions in communication networks A frequency-dependent phase pre-distortion technique is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the frequency-dependent phase pre-distortion of the present inve... | 07/24/2007 |
| 7231191 | Spurious ratio control circuit for use with feed-forward linear amplifiers A control system for a linear feed-forward amplifier, using the ratio of measured spurious energy. Measuring receivers are coupled to two monitoring points to measure the spurious energy content in the error signal and at the main output of a feed-forward amplifier.... | 06/12/2007 |
| 7224223 | Feed-forward power amplifier In a feed-forward power amplifier, a main path amplifies a power level of an input signal to generate a path turning signal, an error path receives the input signal and controls a gain or a phase of a second order intermodulation component in the path turning signal... | 05/29/2007 |
| 7218172 | Apparatus and method for controlling adaptive circuits A feed-forward amplifier having a signal cancellation loop including a cancellation node that includes a gain controller and a phase controller. Each controller provides a discrete tap steering signal and modulates the corresponding tap steering signal with a discre... | 05/15/2007 |
| 7203255 | Method and system to implement non-linear filtering and crossover detection for pilot carrier signal phase tracking Systems and methods for correcting phase ambiguity in a total pilot phase value are presented. Examples include comparing and correcting total pilot phase values having different pilot frequencies within the same sampling interval, such as the same data symbol. Anot... | 04/10/2007 |
| 7197085 | Frequency-dependent magnitude pre-distortion for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the... | 03/27/2007 |
| 7196576 | Method and apparatus for control of predistortion linearizer based on power series A gain adjuster and a phase adjuster of a distortion generation path are set so that an extracted distortion component becomes small, the extracted component is compared with a reference value. When an upper-frequency distortion component of a pilot signal is larger... | 03/27/2007 |
| 7194043 | System and method for predistorting a signal to reduce out-of-band error A predistortion system uses spectral regrowth filtering in a feedback path thereof to reduce out-of-band error. An illustrative embodiment of the system includes a predistortion circuit which generates a predistorted signal, one or more signal processing elements co... | 03/20/2007 |
| 7187232 | Feed forward amplifier employing positive feedback pilot generation with automatic level control A feed forward amplifier and method of amplification are disclosed. The amplifier output is used to generate a pilot signal via feedback using uncancelled noise in the amplifier output. An automatic level control circuit maintains the pilot signal at a substantially... | 03/06/2007 |
