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| Number | Title | Issue Date |
| 8174314 | Aparatus and a method for processing and amplifying a signal A method and an apparatus. The apparatus includes at least one sensor for sensing at least one parameter that affects a non-linearity of the non-linear amplifier and for generating at least one parameter indicator; a memory module for storing multiple sets of pre-di... | 05/08/2012 |
| 8159297 | Transmission device, distortion compensation device, and distortion compensation method A transmission device includes an amplifier that amplifies a transmission signal according to a voltage to be applied, an envelope detector that detects an envelope signal of the transmission signal, a rate decreasing unit that decreases changing rate of the envelop... | 04/17/2012 |
| 8159298 | Linearization circuits and methods for power amplification Linearization circuits of the invention are used in conjunction with power amplification circuits that comprise a power amplifier core. Exemplary linearization circuits comprise a replica of the power amplifier core. In operation, the linearization produces an envel... | 04/17/2012 |
| 8159296 | Method and apparatus for a power supply modulator linearizer A method and apparatus for a power amplifier module is described. The module includes a power amplifier and a power supply modulator coupled to the power amplifier. In addition, the module includes an inverter coupled between the power amplifier and the power supply... | 04/17/2012 |
| 8149051 | Solid-state image sensor A solid-state image sensor capable of suppressing color mixture while suppressing increase of load capacitances of transfer gates and a short circuit between two adjacent transfer gates is provided. This solid-state image sensor comprises a plurality of transfer gat... | 04/03/2012 |
| 8149052 | Method and apparatus to linearize transconductors by predistortion A transconductor for providing an output current that is linear in the input voltage (Vin) comprises a main output transconductor (Ms, Mc) and a model transconductor (Msr1, Msr2, Mcr1, Mcr2) that are controlled by the same signal (Vc, Vcâ... | 04/03/2012 |
| 8143943 | System and a method for signal processing A system for processing an input signal, the system includes: a hardware memory module configured to store a lookup table; and a signal processing module, configured to process the input signal to provide a second signal, and to transmit the second signal to a power... | 03/27/2012 |
| 8115548 | Apparatus and method for controlling distortions of amplifier Disclosed are an apparatus and method for controlling output distortions of an amplifier. The apparatus for controlling output distortions of an amplifier, includes a compensation signal generator to predict a fluctuation of a supply voltage of a power supply using ... | 02/14/2012 |
| 8111101 | Time-alignment of two signals used for digital pre-distortion A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well s... | 02/07/2012 |
| 8102207 | Apparatus and method for broadband amplifier linearization An apparatus and method to improve broadband amplifier linearization. The present circuits make use of pre-distortion techniques to improve the 3rd order distortion of an amplifier to reduce the amount of DC power required to achieve a given system requir... | 01/24/2012 |
| 8093949 | Signal pre-distortion facility for amplifier non-linearity compensation A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well s... | 01/10/2012 |
| 8081029 | Distortion compensation apparatus and method for detecting failure in the same There is provided a distortion compensation apparatus for compensating distortion of an output of a power amplifier included in a radio transmitter. The distortion compensation apparatus includes a difference value calculator to calculate a difference value between ... | 12/20/2011 |
| 8063701 | System for reducing distortion in an electronic circuit using nonlinear feedback System and methods for reducing third harmonic distortion produced by nonlinear amplifiers are disclosed. A system may include an amplifier circuit with an amplifier transistor such that the amplifier is capable of exhibiting an amplifier output signal containing th... | 11/22/2011 |
| 8049560 | Increasing the density of larger magnitude amplifier output samples for estimating a model of digital pre-distortion to compensate for amplifier non-linearity A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well s... | 11/01/2011 |
| 8040182 | Predistorter Provided is a predistorter which compensates for a memory effect occurring in an amplifier used in a communication device, especially an electric memory effect as well. The predistorter includes: a distortion compensation circuit (8) for compensating for a no... | 10/18/2011 |
| 8035447 | Active circuits with load linearization Active circuits with active loads linearized via distortion cancellation are described. In one design, an apparatus includes a first stage and a load stage. For an amplifier, the first stage amplifies an input signal and provides an output signal having a larger sig... | 10/11/2011 |
| 8035446 | Natural sampling for a digital Class-D power amplifier A digital signal processor includes an up-sampling module that samples an input signal and generates up-sampling points. A natural sampling module includes a reference signal generation module that generates a reference signal. A crossing point detection module rece... | 10/11/2011 |
| 8030997 | Resource efficient adaptive digital pre-distortion system A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well s... | 10/04/2011 |
| 8018278 | Pre-distortion apparatus of power amplifier and method thereof A pre-distortion apparatus of a power amplifier includes: a pre-distortion unit configured to generate a pre-distorted signal of an input signal by calculating a magnitude of the input signal and outputting a complex correction coefficient corresponding to the calcu... | 09/13/2011 |
| 8013676 | High-efficiency power amplifier A high-efficiency power amplifier is provided, including a drive amplifier and a final power amplifier, and further including a first digital pre-distortion (DPD) correction module and a second DPD correction module. The first DPD correction module is configured to ... | 09/06/2011 |
| 8004358 | Distortion compensation device A distortion in an amplified signal obtained by amplifying a first input signal, is compensated for by applying a correction factor to the first input signal. The correction factor is updated based on the first input signal and the amplified signal. Updating the cor... | 08/23/2011 |
| 7999614 | Power amplifying device with linear corrector A power amplifying device with linear corrector utilizing the polynomial format to realize pre-distortion is disclosed. Its effective order estimation technique for polynomial based pre-distorter includes the following steps. Firstly, it receives the polynomial of t... | 08/16/2011 |
| 7994856 | Predistorter, predistortion method, and predistortion system This invention relates to a predistorter, a predistortion method, and a predistortion system. The predistorter comprises a modulus value determining section, for determining a modulus value of an input signal; a base searching section, for searching a predetermined ... | 08/09/2011 |
| 7973601 | Distortion compensation apparatus An apparatus for compensating a distortion characteristic of an amplifier includes an update unit configured to store a distortion compensation coefficient, configured to calculate the coefficient based on a signal before input to the amplifier and a feedback signal... | 07/05/2011 |
| 7961046 | Distortion compensating amplifier and front-end distortion compensation amplifying device A distortion compensating amplifier including a forward circuit and a feedback circuit and performing distortion compensation of a signal in the forward circuit by use of a gain of the feedback circuit, includes a detecting unit which detects that the gain of the fo... | 06/14/2011 |
| 7961045 | Amplifier pre-distortion systems and methods A method of optimizing performance of a multiple path amplifier includes: splitting an input signal to derive a respective sub-signal for each branch of the multiple path amplifier; independently pre-distorting each sub-signal using a known performance characteristi... | 06/14/2011 |
| 7952431 | Linearization circuits and methods for power amplification Linearization circuits of the invention are used in conjunction with power amplification circuits that comprise a power amplifier core. Exemplary linearization circuits comprise a replica of the power amplifier core. In operation, the linearization produces an envel... | 05/31/2011 |
| 7948310 | System and a method for signal processing A system for processing an input signal, the system including: (a) a hardware memory module configured to store a lookup table; and (b) a signal processing module, configured to process the input signal to provide a second signal, and to transmit the second signal t... | 05/24/2011 |
| 7948311 | Power series predistorter and control method thereof A power series predistorter of the present invention includes a delay path for delaying a signal, a distortion generation path having an N-th order distortion generator and a vector adjuster, a divider for dividing an input signal between the delay path and the dist... | 05/24/2011 |
| 7944295 | Predistorter The invention aims to converge predistortion coefficients efficiently in a predistorter adapted to compensate for distortion generated in an amplifier. Level detection means detects the level of a signal input to an amplifier. Signal acquisition means acquire a sign... | 05/17/2011 |
| 7940120 | Power amplifier linearization using RF feedback The power amplifier mainly includes a main amplifier, two splitters, one combiner, one subtracter, two phase shifters, one attenuator and one error amplifier. The splitters, subtracter and combiner are designed in the form of 90-degree or quadrature hybrid couplers.... | 05/10/2011 |
| 7936214 | Third order derivative distortion cancellation for ultra low power applications An apparatus and method for the cancellation of third order derivative distortion for ultra low power (ULP) applications are disclosed involving a first amplifier connected in parallel with a second amplifier for amplifying a received signal. The first amplifier inc... | 05/03/2011 |
| 7915954 | Amplifier predistortion and autocalibration method and apparatus Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amp... | 03/29/2011 |
| 7898327 | Correcting distortions at output of power amplifier A solution is provided for correcting distortions on a radio frequency output signal of a power amplifier. There is provided an apparatus, comprising: a processor configured to determine at least one correction factor for a distortion on a radio frequency output sig... | 03/01/2011 |
| 7880543 | Data transmitting circuit and transmitting method A data transmitting circuit includes a reflection suppressive component generating circuit for generating a reflection suppressive component for suppressing the reflection caused by the discontinuity in the characteristic impedance on a transmission line, and a data... | 02/01/2011 |
| 7872528 | Providing pre-distortion to an input signal In one implementation, the present invention includes a diode device to receive an incoming radio frequency (RF) signal to be amplified in a gain device of an amplifier and to provide a pre-distorted signal. Based on this pre-distorted signal, the gain device can ou... | 01/18/2011 |
| 7863980 | Amplifiers with negative capacitance circuits Provided herein are amplifiers including negative capacitance circuits for reducing distortion resulting from a gate-source (or base-emitter) capacitance of output stages of such amplifiers. Such a negative capacitance circuit is connected in parallel with the gate-... | 01/04/2011 |
| 7847631 | Method and apparatus for performing predistortion Embodiments are described herein to provide better predistortion solutions for the linearization of high power amplifiers, especially those with memory effects. Many embodiments involve a method in which a predistorted signal zn is generated from input si... | 12/07/2010 |
| 7839214 | Signal nonlinear distoration magnitude detection method and device The present invention relates to a method for detecting signal nonlinear distortion magnitude, used for extracting and detecting the nonlinear distortion output by a radio frequency power amplifier, characterized in respectively extracting input signal and output si... | 11/23/2010 |
| 7834688 | Linearised power amplifier A linearized power amplifier including a predistorter and a feedforward circuit is described. By using both a predistorter and a feedforward cancellation system the linearization of the amplifier is increased. The accuracy of the amplified signal may be further impr... | 11/16/2010 |
