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| Number | Title | Issue Date |
| 8185066 | Multimode power amplifier with predistortion A device may include an envelope detector to generate an envelope signal from the input signal, a drain bias controller to adjust a drain bias of the amplifier based on the envelope signal, a gate bias controller to adjust a gate bias of the amplifier based on the e... | 05/22/2012 |
| 8180304 | Efficient power amplifier A technique for efficient power amplification includes providing multiple baseband signals to an amplifier. The signals may be converted to RF and combined through one or more impedance inverters. ... | 05/15/2012 |
| 8175551 | Distortion compensation device for use in high-frequency power amplifier A non-linear distortion signal contained in output signal components from a high-frequency power amplifier is detected, while a non-linear distortion signal is generated from a high-frequency signal to be amplified. Correlation between this non-linear distortion sig... | 05/08/2012 |
| 8170507 | Predistortion methods and apparatus for transmitter linearization in a communication transceiver Predistortion methods and apparatus for transmitter linearization in a communication transceiver are disclosed. An example apparatus to linearize a digitally controlled pre-power amplifier included in a transmitter of a communication transceiver disclosed herein com... | 05/01/2012 |
| 8170508 | Pre-distortion for a radio frequency power amplifier Coefficients of a pre-distorter are determined for correction of distortion of a signal amplified by a radio frequency amplifier by sampling the signal at the input to the pre-distorter to generate a plurality of input samples and sampling the signal at the output o... | 05/01/2012 |
| 8150336 | Apparatus and method for adaptive polar transmitter linearization and wireless transmitter employing the same A polar transmitter and a method of linearizing a polar transmitter. In one embodiment, the transmitter includes: (1) a transmit chain having a predistorter configured to employ first amplitude and phase compensation lookup tables to carry out predistortion in the t... | 04/03/2012 |
| 8150335 | Apparatus and method for adaptive cartesian transmitter linearization and wireless transmitter employing the same A Cartesian transmitter and a method of linearizing a Cartesian transmitter. In one embodiment, the transmitter includes: (1) a transmit chain configured to receive an input signal having in-phase and quadrature components and having a predistorter configured to emp... | 04/03/2012 |
| 8145150 | Integrated signal analyzer for adaptive control of mixed-signal integrated circuit A mixed-signal adaptive integrated circuit may comprise a primary function circuit, a digitally controlled analog sub-system cooperatively connected with the primary function circuit, and an on-chip signal analyzer. The on-chip signal analyzer may be arranged to ana... | 03/27/2012 |
| 8140031 | Transmitter built-in production line testing utilizing digital gain calibration A novel and useful self-calibration based production line testing mechanism utilizing built-in closed loop measurements in the radio to calibrate the output power of an external power amplifier coupled to a SoC radio. The mechanism is applicable during production li... | 03/20/2012 |
| 8135361 | Polar modulation transmission apparatus By compensating for a detection result of the detector in feedback control of output power of the power amplifier, the polar modulation transmission apparatus is able to realize accurate transmission power control. Polar modulation transmission apparatus 100 ... | 03/13/2012 |
| 8131233 | Time alignment methods and apparatus for polar modulation transmitters A polar modulation transmitter includes an amplitude modulation (AM) path with an amplitude modulation to amplitude modulation (AM/AM′) correction circuit and a phase modulation (PM) path with a delay element and an amplitude modulation to phase modulation (AM′/... | 03/06/2012 |
| 8121560 | Pre-distortion with enhanced convergence for linearization A pre-distorter is provided for distorting an RF input signal to provide a pre-distorted radio frequency (RF) input signal to an amplifier that provides an amplified RF output signal, wherein the RF input signal has an envelope. The pre-distorter includes: a radio-f... | 02/21/2012 |
| 8116701 | Circuit arrangement and method for setting an analog output signal A circuit arrangement includes a signal processing unit and a regulation unit. The signal processing unit processes an input signal to form an analog output signal. The regulation unit is coupled to the signal processing unit in order to produce a digital regulation... | 02/14/2012 |
| 8107901 | Feedback loop with adjustable bandwidth A feedback loop with an adjustable closed loop frequency response. The feedback loop contains adjustable pole (212, 213) and adjustable zero elements (220,221) for changing the pole and/or zero locations in the feedback loop's loop frequency response t... | 01/31/2012 |
| 8095089 | Predictive transmitter calibration A method and apparatus for calibrating a device. The method includes: selecting a first power level at which a device is to transmit a radio frequency signal; receiving a radio frequency signal having been transmitted from the device based on a predetermined calibra... | 01/10/2012 |
| 8095088 | Compact wide dynamic range transmitter for point to point radio A radio frequency transmitter comprising a modem which receives one or more input data signals and an adaptive predistortion signal and provides a baseband in-phase signal and a baseband quadrature signal. The transmitter may comprise a power amplifier module which ... | 01/10/2012 |
| 8068797 | Gain control methods for wireless devices and transmitters A gain control process (1102) executed at a transmitter (500) generates (1314) a gain ramp signal (1206) having a delay component (1224) and a gain component (1226). The process (1102) further generates (1304) ... | 11/29/2011 |
| 8064851 | RF transmitter with bias-signal-induced distortion compensation and method therefor An RF transmitter (60) generates non-DC bias signals (104, 106) configured to improved power-added efficiency (PAE) in the operation of an RF amplifier (94). The RF amplifier (94) generates an amplified RF signal (126) which, due t... | 11/22/2011 |
| 8064850 | High efficiency linearization power amplifier for wireless communication An embodiment of the invention uses a predistortion correction signal to combination the modulated RF signal by an analog multiplier for linearization of power amplifiers having nonlinear characteristics such as those used in wireless RF transmitters. A predistortio... | 11/22/2011 |
| 8060034 | Polar modulation transmission apparatus By compensating for a detection result of the detector in feedback control of output power of the power amplifier, the polar modulation transmission apparatus is able to realize accurate transmission power control. Polar modulation transmission apparatus 100 ... | 11/15/2011 |
| 8055217 | Adaptive complex gain predistorter for a transmitter Symbols are transmitted in a Cartesian transmitter by pre-distorting an input signal X having in-phase and quadrature components using a first compensation lookup table operable to hold complex valued entries to carry out in-phase and quadrature compensation pre-dis... | 11/08/2011 |
| 8050637 | Polar modulation transmitter, adaptive distortion compensation processing system, polar modulation transmission method, and adaptive distortion compensation processing method An object of the invention is to provide a polar modulation transmitter that can perform adaptive distortion compensation processing without the need for a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal of a power ... | 11/01/2011 |
| 8023908 | Intermodulation signal generator of power amplifier and pre-distortion linearizer having the same Provided are an intermodulation signal generator of a power amplifier and a pre-distortion linearizer having the same. The intermodulation signal generator of the power amplifier includes: a circulator for outputting a radio-frequency (RF) input signal input via a f... | 09/20/2011 |
| 8014735 | RF power amplifier controlled by estimated distortion level of output signal of power amplifier A radio frequency (RF) power amplifier system is provided, in which a distortion of the RF output signal from the power amplifier is estimated by comparing the RF output signal with reference modulation information. The supply voltage to the power amplifier is adjus... | 09/06/2011 |
| 8000661 | Communication system with frequency-adaptive predistorter design A communication system comprises a predistorter for distorting an input signal according to at least one parameter to generate a distorted signal, an amplifier for amplifying the distorted signal according to an input-output characteristic to generate an output sign... | 08/16/2011 |
| 7991367 | Wireless communication unit and power control system thereof A wireless communication unit comprises a transmitter having an analogue feedback power control loop having a power control function arranged to set an output power level of the transmitter. The power control function comprises a predictor sub-system arranged to red... | 08/02/2011 |
| 7974592 | Linearization in a transmission chain A transmission chain comprises a power amplifier adapted for receiving as input a signal to be amplified Sw(t) and for providing as output an amplified signal Dw(t); a predistortion module comprising a linearization unit adapted for applying a predistortion coeffici... | 07/05/2011 |
| 7974593 | Apparatus and method for calibration of gain and/or phase imbalance and/or DC offset in a communication system An example of a radio frequency (RF) transmitter system for communication may include a transmit pre-distortion module configured to provide a second transmit calibration signal during a transmit calibration mode based on a first transmit calibration signal and one ... | 07/05/2011 |
| 7970360 | Electronic device with a distortion correction circuit for a power amplifier, and associated methods An electronic device includes a radio frequency (RF) modulator, a power amplifier, and a distortion correction circuit coupled between the RF modulator and the power amplifier. The distortion correction circuit includes a variable gain amplifier coupled between the ... | 06/28/2011 |
| 7962108 | Adaptive AM/PM compensation A system and method for calibrating Amplitude Modulation to Phase Modulation (AM/PM) compensation circuitry in a mobile terminal operating according to a polar modulation scheme are provided. In general, during ramp-up for a transmit burst, measurements of a phase e... | 06/14/2011 |
| 7953378 | Predistortion circuit for a transmit system Systems and methods related to amplifier systems which use a predistortion subsystem to compensate for expected distortions in the system output signal. A signal processing subsystem receives an input signal and decomposes the input signal into multiple components. ... | 05/31/2011 |
| 7937049 | Output power correction module for amplifiers in transmitters According to an exemplary embodiment, a transmitter system includes a power amplifier receiving a supply voltage and a supply current from a power control/current detection circuit, where the power amplifier drives a load impedance. The transmitter system further in... | 05/03/2011 |
| 7929927 | Adaptive pre-distortion with interference detection and mitigation Embodiments include methods, apparatus, and electronic systems adapted to perform adaptive pre-distortion. Embodiments include combining an input sample with a gain value to generate a pre-distorted data sample, where the gain value is a function of at least one gai... | 04/19/2011 |
| 7899416 | RF transmitter with heat compensation and method therefor An RF transmitter (10) includes an RF amplifier (22) that experiences gain-droop distortion as a result of self-heating. A heat compensator (20) is included to insert a gain boost of an amount which is the inverse of the gain droop experienced b... | 03/01/2011 |
| 7881680 | Predictive transmitter calibration Apparatus for calibrating a transmitter of a first integrated circuit, the transmitter being capable of transmitting a signal at N different transmit power levels based on N respective calibration values stored in the first integrated circuit, wherein N>1, the appar... | 02/01/2011 |
| 7873331 | Systems, methods, and apparatuses for multi-path orthogonal recursive predistortion System and methods are provided for multi-path orthogonal recursive predistortion. The systems and methods may include generating a first orthogonal signal and a second orthogonal signal, where the first and second signals are orthogonal components of an input signa... | 01/18/2011 |
| 7860466 | Systems, methods, and apparatuses for linear polar transmitters Systems and methods are disclosed for providing a linear polar transmitter. The systems and methods may include generating an input amplitude signal and an input phase signal, where the input amplitude signal and the input phase signal are orthogonal components of a... | 12/28/2010 |
| 7848717 | Method and system for out of band predistortion linearization The present invention discloses a method and a system for out-of-band predistortion linearization, comprising steps of: dividing base band inputted or intermediate frequency signal into an in-band signal branch and an out-of-band signal branch; processing the in-ban... | 12/07/2010 |
| 7831221 | Predistortion system and amplifier for addressing group delay modulation An amplifier includes an RF power amplifier and a predistortion circuit coupled to the power amplifier. The predistortion circuit affects an input path of an RF input signal to the power amplifier. The predistortion circuit is operable for detecting a level of an in... | 11/09/2010 |
| 7817970 | Transmitting/receiving device having a polar modulator with variable predistortion The transmitting/receiving device has a polar modulator with a variable predistorter (11, 12) and an amplifier (8) which can be modulated, a reception path (25) which can be operated both during conventional reception and for the purposes of adj... | 10/19/2010 |
