公开(公告)号：US20080094139A1

公开(公告)日：2008-04-24

申请号：US12000616

申请日：2007-12-14

Applicant: Takeshi Takano ,  Yasuyuki Oishi ,  Toru Maniwa

Inventor： Takeshi Takano ,  Yasuyuki Oishi ,  Toru Maniwa

IPC: H03F1/26

CPC classification number: H03F1/3247 ,  H03F1/30 ,  H03F1/3282 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.

Abstract translation: 功率放大器消除了记忆效应，并且即使在廉价的设备中也使用数字预失真系统应用线性化。 功率放大器将输入信号功率与输出功率的采样分量进行比较，并且为输入信号功率提供预失真，以便作为比较的结果使差异最小化。 功率放大器包括：增益查找表，其存储对应于为输入功率确定的温度地址的增益系数值; 相位查找表，存储与为输入功率确定的温度地址对应的相位系数值; 横向滤波器，其输入有输入功率，并输出温度地址; 以及系数乘法器，其使用与所述温度地址对应并且从所述增益系数查找表和所述相位查找表读出的增益系数值和相位系数值来调制所述输入信号。

公开(公告)号：US20070063770A1

公开(公告)日：2007-03-22

申请号：US10560346

申请日：2003-06-18

Applicant: Leonard Rexberg

Inventor： Leonard Rexberg

IPC: H03F1/26

CPC classification number: H03F1/3247 ,  H03F1/3252 ,  H03F1/3294 ,  H03F2201/3209

Abstract: A power amplifier pre-distorter is formed by a FIR filter structure which includes an individual look-up table for each filter tap, where each look-up table represents a sampled polynomial in a variable representing signal amplitude, and means for selecting, from each filter tap look-up table, a filter coefficient that depends on the amplitude of a corresponding complex signal value to be multiplied by the filter tap. A training method for such a pre-distorter determines (S1) a first estimate of a first look-up table assigned to a first filter tap, assuming a second look-up table assigned to a second filter tap is set to predetermined table values. Thereafter the method determines (S2) a second estimate of the second look-up table, assuming the first look-up table is set to the determined first estimate. If deemed necessary, the method includes the further steps (a) refining (S3) the first estimate refined, assuming the second look-up table is set to the latest determined second estimate, and (b) refining (S4) the second estimate, assuming the first look-up table is set to the latest determined first estimate. Steps (a) and (b) may be repeated (S5) until convergence is reached.

Abstract translation: 功率放大器预失真器由FIR滤波器结构形成，其包括用于每个滤波器抽头的单独查找表，其中每个查找表表示代表信号幅度的变量中的采样多项式，以及用于从每个 滤波器抽头查找表，取决于要乘以滤波器抽头的相应复信号值的幅度的滤波器系数。 这种预失真器的训练方法确定（S1）分配给第一滤波器抽头的第一查找表的第一估计，假设分配给第二滤波器抽头的第二查找表被设置为预定表值 。 此后，假设将第一查找表设置为所确定的第一估计，该方法确定（S 2）第二查找表的第二估计。 如果认为必要的话，该方法包括以下步骤：（a）将第二估计值设定为最新确定的第二估计值，并且（b）精化（S 4）第二估计值， 估计，假设第一查询表被设置为最新确定的第一估计。 可以重复步骤（a）和（b）（S 5），直到达到收敛。

公开(公告)号：US20050195919A1

公开(公告)日：2005-09-08

申请号：US11063297

申请日：2005-02-22

Applicant: Armando Cova

Inventor： Armando Cova

IPC: H04K1/02

CPC classification number: H03F1/3294 ,  H03F1/3258 ,  H03F2201/3209 ,  H03F2201/3224 ,  H04L25/03343

Abstract: 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 to minimize distortion at the output of the amplifier. The predistorter uses a discrete-time polynomial kernel to model the inverse transfer characteristic of the amplifier, providing separate and simultaneous compensation for nonlinear static distortion, linear dynamic distortion and nonlinear dynamic effects including reactive electrical memory effects. Compensation for higher order reactive and thermal memory effects is embedded in the nonlinear dynamic compensation operation of the predistorter in an IIR filter bank. A predistortion controller periodically monitors the output of the amplifier and compares it to the quadrature input signal to compute estimates of the residual output distortion of the amplifier. Output distortion estimates are used to adaptively compute the values of the parameters of the predistorter in response to changes in the amplifier's operating conditions (temperature drifts, changes in modulation input bandwidth, variations in drive level, aging, etc). The predistortion parameter values computed by the predistortion controller are stored in non-volatile memory and used in the polynomial digital predistorter. The digital predistortion system of the invention may provide broadband linearization of highly nonlinear and highly efficient RF amplification circuits including, but not limited to, dynamic load modulation amplifiers.

Abstract translation: 公开了一种使用基带预失真技术对RF高效放大器的非线性行为进行数字线性化的系统。 该系统提供数字正交（I / Q）输入信号的加法或乘法预失真，以便最小化放大器输出端的失真。 预失真器使用离散时间多项式内核来对放大器的反向传输特性进行建模，为非线性静态失真，线性动态失真和包括无功电气记忆效应的非线性动态效应提供单独和同时的补偿。 高阶无功和热记忆效应的补偿嵌入在IIR滤波器组中的预失真器的非线性动态补偿操作中。 预失真控制器周期性地监视放大器的输出并将其与正交输入信号进行比较，以计算放大器的剩余输出失真的估计。 输出失真估计用于响应于放大器工作条件（温度漂移，调制输入带宽变化，驱动电平变化，老化等）的变化，自适应地计算预失真器的参数值。 由预失真控制器计算的预失真参数值存储在非易失性存储器中，用于多项式数字预失真器。 本发明的数字预失真系统可以提供高度非线性和高效的RF放大电路的宽带线性化，包括但不限于动态负载调制放大器。

公开(公告)号：US20050189990A1

公开(公告)日：2005-09-01

申请号：US11065274

申请日：2005-02-25

Applicant: Shinji Mizuta ,  Yasunori Suzuki

Inventor： Shinji Mizuta ,  Yasunori Suzuki

IPC: H03F1/32 ,  H03F3/24 ,  H04B1/04 ,  H03F3/66 ,  H03F1/26

CPC classification number: H03F1/3258 ,  H03F1/3247 ,  H03F2201/3209

Abstract: 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 than the reference value, the gain and phase of a frequency characteristic compensator of the distortion generation path are controlled so that the upper-frequency distortion component of the pilot signal becomes smaller than a value preset in the controller. When a lower-frequency distortion component of the pilot signal is larger than a reference value, the gain and phase of the frequency characteristic compensator of the distortion generation path are controlled so that the lower-frequency distortion component of the pilot signal becomes smaller than a value preset in the controller.

Abstract translation: 设置增益调节器和失真产生路径的相位调整器，使得提取的失真分量变小，将提取的分量与参考值进行比较。 当导频信号的高频失真分量大于参考值时，控制失真产生路径的频率特性补偿器的增益和相位，使得导频信号的高频失真分量变得小于 值在控制器中预设。 当导频信号的低频失真分量大于参考值时，控制失真产生路径的频率特性补偿器的增益和相位，使得导频信号的低频失真分量变得小于 值在控制器中预设。

公开(公告)号：US20030227330A1

公开(公告)日：2003-12-11

申请号：US10410457

申请日：2003-04-08

Inventor： Ahmad Khanifar ,  Nikolai Maslennikov ,  Gareth Spiller

IPC: H03F003/191

CPC classification number: H03F1/3241 ,  H03F1/0261 ,  H03F1/30 ,  H03F1/3235 ,  H03F3/60 ,  H03F2200/12 ,  H03F2200/15 ,  H03F2200/451 ,  H03F2201/3209 ,  H03F2201/3224

Abstract: An RF power amplifier having reduced memory effects is disclosed. This is achieved by a novel design of the DC supply feed network to achieve low impedance across video frequencies, whilst maintaining the correct RF output matching. One or more transmission zeros are provided in the bias circuit transfer function, which are positioned in the video bandwidth so as to provide low and relatively constant impedance across the video bandwidth. Also, a parallel DC feed line may be employed to reduce impedance across the video bandwidth. The reduction in memory effects allows improved performance of predistortion linearization techniques and an implementation in a feed forward amplifier employing predistortion linearization is also disclosed.

Abstract translation: 公开了具有减小的记忆效应的RF功率放大器。 这是通过直流供电馈电网络的新颖设计实现的，以实现视频频率的低阻抗，同时保持正确的RF输出匹配。 在偏置电路传递函数中提供一个或多个传输零点，偏置电路传递函数位于视频带宽中，以便在视频带宽上提供低且相对恒定的阻抗。 此外，可以采用并联DC馈线来减少跨越视频带宽的阻抗。 存储器效应的降低允许改善预失真线性化技术的性能，并且还公开了采用预失真线性化的前馈放大器中的实现。

公开(公告)号：US20020008578A1

公开(公告)日：2002-01-24

申请号：US09899360

申请日：2001-07-05

Inventor： Andrew S. Wright ,  Bartholomeus T.W. Klijsen ,  Paul V. Yee ,  Chun Yeung Kevin Hung ,  Steven J. Bennett

IPC: H03F001/26

CPC classification number: H03F1/3258 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3294 ,  H03F2201/3209 ,  H03F2201/3233

Abstract: A wideband predistortion system compensates for a nonlinear amplifier's frequency and time dependent AM-AM and AM-PM distortion characteristics. The system comprises a data structure in which each element stores a set of compensation parameters (preferably including FIR filter coefficients) for predistorting the wideband input transmission signal. The parameter sets are preferably indexed within the data structure according to multiple signal characteristics, such as instantaneous amplitude and integrated signal envelope, each of which corresponds to a respective dimension of the data structure. To predistort the input transmission signal, an addressing circuit digitally generates a set of data structure indices from the input transmission signal, and the indexed set of compensation parameters is loaded into a compensation circuit which digitally predistorts the input transmission signal. This process of loading new compensation parameters into the compensation circuit is preferably repeated every sample instant, so that the predistortion function varies from sample-to-sample. The sets of compensation parameters are generated periodically and written to the data structure by an adaptive processing component that performs a non-real-time analysis of amplifier input and output signals. The adaptive processing component also implements various system identification processes for measuring the characteristics of the power amplifier and generating initial sets of filter coefficients. In an antenna array embodiment, a single adaptive processing component generates the compensation parameters sets for each of multiple amplification chains on a time-shared basis. In an embodiment in which the amplification chain includes multiple nonlinear amplifiers that can be individually controlled (e.g., turned ON and OFF) to conserve power, the data structure separately stores compensation parameter sets for each operating state of the amplification chain.

公开(公告)号：US11936341B2

公开(公告)日：2024-03-19

申请号：US17351667

申请日：2021-06-18

Applicant: Qorvo US, Inc.

Inventor： Nadim Khlat

IPC: H03F1/02 ,  H03F1/32 ,  H03F1/56 ,  H03F3/195 ,  H03F3/21 ,  H03F3/24

CPC classification number: H03F1/0233 ,  H03F1/0227 ,  H03F1/3241 ,  H03F1/3258 ,  H03F1/56 ,  H03F3/195 ,  H03F3/21 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/105 ,  H03F2200/451 ,  H03F2201/3209

Abstract: Envelope tracking power supply circuitry includes a look up table (LUT) configured to provide a target supply voltage based on a power envelope measurement. The target supply voltage is dynamically adjusted based on a delay between the power envelope of an RF signal and a provided envelope tracking supply voltage. The envelope tracking supply voltage is generated from the adjusted target supply voltage in order to synchronize the envelope tracking supply voltage with the power envelope of the RF signal.

公开(公告)号：US20180227152A1

公开(公告)日：2018-08-09

申请号：US15827794

申请日：2017-11-30

Applicant: Dali Systems Co. Ltd.

Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Ying Xiao

IPC: H04L27/00 ,  H04L27/36 ,  H03F1/30 ,  H03F1/32 ,  H03F3/08 ,  H03F3/19 ,  H03F3/24 ,  H04W24/02 ,  H04L25/08 ,  H04L25/06

CPC classification number: H03F1/304 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3258 ,  H03F3/087 ,  H03F3/19 ,  H03F3/24 ,  H03F2200/18 ,  H03F2200/204 ,  H03F2200/207 ,  H03F2200/447 ,  H03F2200/451 ,  H03F2201/3206 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3215 ,  H03F2201/3224 ,  H03F2201/3227 ,  H04L25/067 ,  H04L25/08 ,  H04L27/0008 ,  H04L27/368 ,  H04W24/02

Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

公开(公告)号：US20180219578A1

公开(公告)日：2018-08-02

申请号：US15885091

申请日：2018-01-31

Applicant: Roshmere, Inc.

Inventor： Eduardo Temprana Giraldo ,  Nikola Alic

IPC: H04B3/32 ,  H04B1/04 ,  H03F1/32 ,  H04L27/01 ,  H04L27/00 ,  H03F3/24

CPC classification number: H04B3/32 ,  H03F1/3276 ,  H03F1/3294 ,  H03F3/245 ,  H03F2201/3209 ,  H03F2201/3233 ,  H04B1/0475 ,  H04L27/0014 ,  H04L27/01

Abstract: In a system, known digital representations are generated, and test analog signals are generated using the known digital representations. The test analog signals are transmitted using a transmitter of a transmission system. The test analog signals are received using a receiver of the transmission system and used to generate test received digital representations. The test received digital representations are cross-correlated with the known digital representations to generate a mixing matrix. The mixing matrix is inverted to generate a de-mixing matrix, which is applied to subsequent digital data to be encoded onto a signal and transmitted by the transmitter to generate pre-compensated digital data.

公开(公告)号：US09760338B2

公开(公告)日：2017-09-12

申请号：US15187651

申请日：2016-06-20

Applicant: Intel Corporation

Inventor： Kameran Azadet

IPC: G06F5/01 ,  G06F17/15 ,  H03H17/06 ,  H04B1/04 ,  H04L1/00 ,  H04L27/233 ,  H04B1/62 ,  G06F9/30 ,  H04L25/02 ,  H04L25/03 ,  H03M3/00 ,  H03F1/02 ,  H03F1/32 ,  H03F3/189 ,  H03F3/24 ,  H04L25/49 ,  H04B1/00

CPC classification number: G06F9/3001 ,  G06F5/01 ,  G06F9/30036 ,  G06F17/15 ,  H03F1/0288 ,  H03F1/3241 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233 ,  H03H17/06 ,  H03M3/30 ,  H04B1/0003 ,  H04B1/0475 ,  H04B1/62 ,  H04B2001/0408 ,  H04L1/0054 ,  H04L25/02 ,  H04L25/03 ,  H04L25/03178 ,  H04L25/03216 ,  H04L25/4917 ,  H04L27/2334

Abstract: Methods and apparatus are provided for direct synthesis of RF signals using maximum likelihood sequence estimation. An RF digital RF input signal is synthesized by performing maximum likelihood sequence estimation on the digital RF input signal to produce a digital stream, such that after filtering by a prototype filter the produced digital stream produces a substantially minimum error. The substantially minimum error comprises a difference between a digital output of the prototype filter and the digital RF input signal. The digital stream is substantially equal to the input digital RF signal. The digital stream can be applied to an analog restitution filter, and the output of the analog restitution filter comprises an analog RF signal that approximates the digital RF input signal.