公开(公告)号：EP1489803A1

公开(公告)日：2004-12-22

申请号：EP03703350.3

申请日：2003-02-19

Applicant: NEC Corporation

Inventor： KUROKAMI, Yuzo, NEC CORPORATION

IPC: H04L27/00

CPC classification number: H03F1/3247 ,  H03F1/3241 ,  H03F1/3294 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H04L27/364 ,  H04L27/368 ,  H04L2027/0067

Abstract: To perform an ideal nonlinear distortion compensation by eliminating an influence of incompleteness of amplitude delay characteristics or an intrinsic deviation that an amplifier has. A linear distortion compensation coefficient calculation unit (18) estimates linear distortion characteristics caused by incompleteness of an analog circuit mainly such as a quadrature modulator (13) or a high output amplifier (14) based on quadrature demodulated signals (I'ch, Q'ch), and calculates and outputs a linear distortion compensation coefficient for compensating for the linear distortion. A linear distortion compensation processing unit (12) performs a predistortion (addition of inverse characteristics of linear distortion characteristics) by adding data of the linear distortion compensation coefficient to baseband signals (Ich, Qch).

Abstract translation: 通过消除幅度延迟特性的不完全性或放大器具有的固有偏差的影响来执行理想的非线性失真补偿。 线性失真补偿系数计算单元（18）基于正交解调信号（I'ch，Q'）来估计主要由诸如正交调制器（13）或高输出放大器（14）的模拟电路的不完备性引起的线性失真特性， ch），并且计算并输出用于补偿线性失真的线性失真补偿系数。 线性失真补偿处理单元（12）通过将线性失真补偿系数的数据与基带信号（Ich，Qch）相加来执行预失真（线性失真特性的逆特性的加法）。

公开(公告)号：EP1065856A3

公开(公告)日：2003-09-03

申请号：EP00830422.2

申请日：2000-06-15

Applicant: Itelco - S.p.A.

Inventor： Andreoli, Sante ,  Banelli, Paolo

IPC: H04L27/36 ,  H04L25/03 ,  H03F3/32 ,  H04B1/04 ,  H03F1/32

CPC classification number: H03F1/3282 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3294 ,  H03F2200/102 ,  H03F2200/336 ,  H03F2200/438 ,  H03F2200/57 ,  H03F2200/66 ,  H03F2201/3233 ,  H04B2001/0425 ,  H04L27/361 ,  H04L27/368

Abstract: The present invention concerns a predistortion system for amplifier linearisation characterised by the fact that it comprises a predistortion circuit in cascade to a clipping circuit composed of at least one clipping device followed by at least one post-clipping filter device.

公开(公告)号：EP0953232A1

公开(公告)日：1999-11-03

申请号：EP98947576.0

申请日：1998-10-07

Applicant: NOKIA TELECOMMUNICATIONS OY

Inventor： PELLONPERÄ, Marko

IPC: H03F1 ,  H03C3 ,  H03F3 ,  H04B1 ,  H04L27

CPC classification number: H03F3/191 ,  H03C3/08 ,  H03F1/32 ,  H03F1/34 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H04B2001/0433 ,  H04L27/368

Abstract: A method of compensating delay in a linearization loop of a power amplifier and a linearization arrangement of a power amplifier, which arrangement comprises an I/Q modulator (10), one or more power amplifiers (13) to be linearized and generating delay, and a feedback loop comprising an I/Q demodulator (11) when the I/Q modulator (10) and the I/Q demodulator (11) derive an oscillator frequency from the same local oscillator (14). In accordance with the invention, the delay generated by the power amplifier in the feedback is compensated by delaying a local oscillator signal applied to the I/Q demodulator (11). The delay of the local oscillator signal applied to the I/Q demodulator (11) is generated by an amplifier optimized to have a great delay, preferably by a small-signal amplifier.

Abstract translation: 一种补偿功率放大器的线性化环路和功率放大器的线性化装置中的延迟的方法，所述装置包括I / Q调制器（10），一个或多个待线性化并产生延迟的功率放大器（13），以及 当I / Q调制器（10）和I / Q解调器（11）从相同的本地振荡器（14）导出振荡器频率时，反馈回路包括I / Q解调器（11）。 根据本发明，通过延迟施加到I / Q解调器（11）的本地振荡器信号来补偿功率放大器在反馈中产生的延迟。 施加到I / Q解调器（11）的本地振荡器信号的延迟由优化为具有大延迟的放大器产生，优选地由小信号放大器产生。

公开(公告)号：EP0951143A2

公开(公告)日：1999-10-20

申请号：EP99302705.1

申请日：1999-04-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Kim, Helen Haeran

IPC: H03G3/30

CPC classification number: H03F1/345 ,  H03C3/406 ,  H03F1/3247 ,  H03F1/3294 ,  H03F2200/321 ,  H03F2200/336 ,  H03F2200/78 ,  H03G3/3036

Abstract: In a wireless transmitter (100), a class B or class C amplifier (131) is used as a power amplifier for boosting the power level of a signal to be transmitted. To linearize the power amplifier, a feedback mechanism (165) is included in the transmitter. The feedback mechanism provides for adjustment of a feedback gain which effects the overall gain of the signal, thereby effectively controlling the signal power level. In addition, a phase difference between components of the signal and the feedback versions thereof is corrected to increase the linearity of the power amplifier and stabilize the feedback mechanism.

Abstract translation: 在无线发射机（100）中，使用B类或C类放大器（131）作为功率放大器，用于提升要发射的信号的功率电平。 为了线性化功率放大器，发射机中包含一个反馈机制（165）。 反馈机制用于调整影响信号整体增益的反馈增益，从而有效地控制信号功率电平。 此外，校正信号的分量与其反馈版本之间的相位差，以增加功率放大器的线性度并稳定反馈机制。

公开(公告)号：EP0495921A4

公开(公告)日：1992-09-23

申请号：EP90917172

申请日：1990-10-10

Applicant: MOTOROLA, INC.

Inventor： LEITCH, CLIFFORD, D.

IPC: H03F1/26 ,  H03C3/08 ,  H03F1/32 ,  H03F1/34 ,  H04L27/36

CPC classification number: H03F1/3282 ,  H03C3/08 ,  H03F1/3247 ,  H03F1/3276 ,  H03F1/3294 ,  H03F1/34 ,  H03F2200/102 ,  H03F2200/336 ,  H03F2200/57 ,  H04L27/368

Abstract: A transmitter (100), with an inphase input (102) for receiving an inphase baseband input signal, and a quadrature input (112) for receiving a quadrature baseband input signal, comprises a modulator (130), coupled to the inphase and quadrature inputs, for modulating the inphase and quadrature baseband signals, to provide a modulated radio-frequency signal, and a linear amplifier (135), coupled to the modulator, for amplifying the modulated radio-frequency signal to produce an output signal. An oscillation detector is coupled to receive the output signal, for detecting oscillation, and for producing an error signal as a result of the oscillation. The transmitter also comprises circuitry (transmission gates 124, 126, 127, and 128) for reducing the open loop gain of the feedback loop, disposed between the inphase and quadrature inputs and the modulator. The circuitry for reducing the open loop gain reduces the open loop gain of the transmitter to less than one, in response to the error signal.

公开(公告)号：EP3053266B1

公开(公告)日：2018-12-05

申请号：EP14850285.9

申请日：2014-10-01

Applicant: Nokia Solutions and Networks Oy

Inventor： KULARATNA, Shavantha ,  REICHL, Christian ,  JELONNEK, Bjoern ,  PEREIRA, Alan ,  SCHEDEEN, Glenn ,  MEHTA, Sandeep

IPC: H03F1/26

CPC classification number: H03F1/3247 ,  H03F1/02 ,  H03F3/19 ,  H03F3/195 ,  H03F3/21 ,  H03F3/213 ,  H03F3/24 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2201/3227 ,  H04B1/0475 ,  H04B1/40 ,  H04B2001/0416 ,  H04B2001/045

Abstract: Enhancing the intermodulation performance of an RF power amplifier by determining a coarse time delay represented by an integer T1; determining a reference point for a transmitted signal waveform of the RF power amplifier; shifting the waveform by a set of offsets comprising a plurality of non-integer fractional steps from (T1−Xd) to (T1+Xd) where T1 is the integer and Xd is a non-integer fractional step size value for defining fractional steps about the integer T1 such that the non-integer fractional steps progress in a positive direction as well as a negative direction; correlating the transmitted signal waveform with a feedback signal waveform to obtain a respective correlation value for each of corresponding fractional steps; obtaining an accurate fractional delay value by selecting a fractional step having a highest respective correlation value; applying the obtained correct fractional delay value to the transmitted signal waveform to provide a compensated transmitted signal waveform, and combining the compensated transmitted signal waveform with the feedback signal waveform to reduce at least one intermodulation product of the RF power amplifier.

公开(公告)号：EP2768194B1

公开(公告)日：2017-11-01

申请号：EP13786406.2

申请日：2013-07-31

Applicant: Huawei Technologies Co., Ltd.

Inventor： LI, Jun ,  LI, Xianfeng ,  PANG, Yanzhao

IPC: H04L25/49 ,  H04L25/03 ,  H03F3/195 ,  H03F3/24 ,  H04L27/36

CPC classification number: H03F1/3241 ,  H03F1/3247 ,  H03F1/3294 ,  H03F3/195 ,  H03F3/245 ,  H03F2200/336 ,  H04L27/368

公开(公告)号：EP2737624B1

公开(公告)日：2017-08-09

申请号：EP12755902.9

申请日：2012-06-27

Applicant: Telefonaktiebolaget LM Ericsson (publ)

Inventor： MORRIS, Bradley John ,  MCGOWAN, Neil ,  KILAMBI, Sai Mohan

IPC: H03F1/32 ,  H04L25/03 ,  H04L27/26

CPC classification number: H04L27/2614 ,  H03F1/3282 ,  H03F3/189 ,  H03F3/245 ,  H03F2200/111 ,  H03F2200/336 ,  H03F2200/429 ,  H03G7/007 ,  H04L25/03343

Abstract: Peak power reduction in transmit chains of multi-band radiocommunication devices is performed. By using knowledge of the phase transformations which occur at the upconverter to determine how baseband signal samples will combine at the higher (upconverted) frequency, peak prediction and corresponding baseband signal modification can be performed in a way that reduces peak power of the combined signal.

Abstract translation: 执行多频段无线电通信设备发射链中的峰值功率降低。 通过使用在上变频器处出现的相变知识来确定基带信号样本如何在较高（上变频）的频率处组合，可以以降低组合信号的峰值功率的方式执行峰值预测和相应的基带信号修改。

公开(公告)号：EP3103198A4

公开(公告)日：2017-07-19

申请号：EP14881998

申请日：2014-09-30

Applicant: TEXAS INSTRUMENTS INC

Inventor： HEZAR RAHMI ,  DING LEI ,  HAROUN BAHER

IPC: H03F1/02 ,  H03F3/19 ,  H03F3/217 ,  H03F3/24 ,  H04B14/06 ,  H04L27/20

CPC classification number: H04L27/3411 ,  H03F1/02 ,  H03F1/0294 ,  H03F3/19 ,  H03F3/2175 ,  H03F3/245 ,  H03F2200/331 ,  H03F2200/336 ,  H03F2200/451 ,  H04B1/02 ,  H04B14/062 ,  H04L27/2053

Abstract: At least one tone is generated. An output signal is generated in response to an input signal and the at least one tone. The output signal is modulated. The input signal and the at least one tone are represented in the modulated output signal. The at least one tone is outside a bandwidth of the input signal as represented in the modulated output signal. The modulated output signal is amplified. The at least one tone in the amplified signal is attenuated after the amplifying.

Abstract translation: 至少生成一种音调。 输出信号响应于输入信号和至少一个音调而生成。 输出信号被调制。 输入信号和至少一个音调在调制输出信号中表示。 至少一个音调在调制输出信号中表示的输入信号的带宽之外。 调制的输出信号被放大。 放大后的信号中的至少一个音调被衰减。

公开(公告)号：EP3161957A1

公开(公告)日：2017-05-03

申请号：EP15729686.4

申请日：2015-06-02

Applicant: Qualcomm Incorporated

Inventor： BUTTERFIELD, Daniel Keyes ,  WANG, Peiyuan ,  DUNWORTH,Jeremy Darren

IPC: H03F1/02 ,  H03F3/00 ,  H03F3/21 ,  H03F3/217 ,  H03F3/24 ,  H03F3/45

CPC classification number: H04B1/0458 ,  H03F1/02 ,  H03F1/0205 ,  H03F1/32 ,  H03F3/005 ,  H03F3/19 ,  H03F3/21 ,  H03F3/211 ,  H03F3/24 ,  H03F3/45179 ,  H03F2200/331 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2200/516 ,  H03F2200/537 ,  H03F2200/541 ,  H03F2203/21142 ,  H03F2203/45364 ,  H03M1/066 ,  H03M1/66 ,  H03M1/804 ,  H03M7/165 ,  H04B1/0475 ,  H04B2001/045 ,  H04L27/3416 ,  H04L27/36

Abstract: The present disclosure includes switched capacitor transmitter circuits and methods. In one embodiment, the present disclosure includes a plurality of switched capacitor transmitter circuits coupled to inputs of an inductive network. The inductive network combines voltages from the switched capacitor transmitter circuits to produce a combined voltage on an output. In another embodiment, a digital data signal is thermometer encoded and a negative thermo-encoded signal is bit order reversed to control capacitors in a switched capacitor transmitter circuit.

Abstract translation: 本公开包括开关电容器发射器电路和方法。 在一个实施例中，本公开包括耦合到电感网络的输入的多个开关电容器发射器电路。 电感网络将来自开关电容发射器电路的电压进行组合，以在输出上产生组合电压。 在另一个实施例中，数字数据信号被温度计编码，并且负温度编码信号被位反转以控制开关电容器发送器电路中的电容器。