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    Distortion compensating apparatus and method
    21.
    发明申请
    Distortion compensating apparatus and method 有权
    失真补偿装置及方法

    公开(公告)号：US20070188225A1

    公开(公告)日：2007-08-16

    申请号：US11437188

    申请日：2006-05-19

    Applicant: Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

    Inventor： Hideharu Shako ,  Yasuhito Funyu ,  Takeshi Ohba

    IPC: H03F1/26

    CPC classification number: H03F1/3247 ,  H03F1/3294 ,  H03F2200/336 ,  H03F2200/465 ,  H03F2201/3227 ,  H03F2201/3233

    Abstract: The distortion compensating apparatus, which adaptively updates a distortion compensation coefficient for an amplifier based on a difference between input and output signals of the amplifier, comprises: a distortion amount detector which detects the amount of distortion of an output signal of the amplifier; a parameter holder which holds a parameter having been set therein; a parameter corrector which corrects the parameter in such a manner that the distortion amount detected by the detector is improved; a power monitor which monitors output power of the amplifier or a factor of variation in the power; and a controller which halts, if a monitoring result by the power monitor is smaller than a specified threshold value, the correction of the parameter. This arrangement makes it possible to accurately set the parameter relating to difference detection which is a factor of updating of distortion compensation coefficients of the distortion compensating apparatus.

    Abstract translation: 基于放大器的输入和输出信号之间的差异自适应地更新放大器的失真补偿系数的失真补偿装置包括：失真量检测器，其检测放大器的输出信号的失真量; 参数保持器，其保持已设置的参数; 参数校正器，其以使检测器检测到的失真量提高的方式校正参数; 监视放大器的输出功率或电源变化的功率监视器; 以及控制器，如果功率监视器的监视结果小于指定的阈值，则停止参数的校正。 这种布置使得可以精确地设置与作为失真补偿装置的失真补偿系数的更新的因素的差分检测相关的参数。

    Amplifier linearization using non-linear predistortion
    22.
    发明申请
    Amplifier linearization using non-linear predistortion 失效
    使用非线性预失真的放大器线性化

    公开(公告)号：US20050111575A1

    公开(公告)日：2005-05-26

    申请号：US10718688

    申请日：2003-11-24

    Applicant: Ilan Taler ,  Dan Wolberg ,  Ran Sharon

    Inventor： Ilan Taler ,  Dan Wolberg ,  Ran Sharon

    IPC: H03F20060101 ,  H03F1/32 ,  H04K1/02

    CPC classification number: H03F1/32 ,  H03F1/3247 ,  H03F1/3276 ,  H03F2201/3227

    Abstract: Apparatus for amplifying an input signal having an input signal power includes a power amplifier, which is adapted to amplify an intermediate signal so as to generate an output signal, and which is characterized by a non-linearity. A non-linear filter is coupled to decompose the input signal into a series of input signal components, each such component proportional to a product of the input signal by a respective integer power of the input signal power, and is adapted to filter the signal components responsively to the non-linearity so as to generate the intermediate signal for input to the power amplifier.

    Abstract translation: 用于放大具有输入信号功率的输入信号的装置包括功率放大器，其适于放大中间信号以产生输出信号，其特征在于非线性。 耦合非线性滤波器以将输入信号分解成一系列输入信号分量，每个这样的分量与输入信号乘以输入信号功率的相应整数倍的乘积成比例，并且适于对信号分量进行滤波 响应于非线性，以产生输入到功率放大器的中间信号。

    Pre-distortion cross-cancellation for linearizing power amplifiers
    23.
    发明申请
    Pre-distortion cross-cancellation for linearizing power amplifiers 失效
    用于线性化功率放大器的预失真交叉消除

    公开(公告)号：US20050026574A1

    公开(公告)日：2005-02-03

    申请号：US10628263

    申请日：2003-07-28

    Applicant: Josef Ocenasek ,  James Giacobazzi

    Inventor： Josef Ocenasek ,  James Giacobazzi

    IPC: H03F1/32 ,  H04B1/04 ,  H04B1/00 ,  H04B1/06 ,  H04B7/00

    CPC classification number: H04B1/0483 ,  H03F1/3247 ,  H03F1/3252 ,  H03F2201/3227 ,  H04B1/0475

    Abstract: In an amplifier system having two or more different amplifier sub-systems, the input signal to at least one of the amplifier sub-systems is pre-distorted based on the combined output signal from the two or more amplifier sub-systems. In one embodiment, each other amplifier sub-system pre-distorts its input signal based on only its own output signal. In one operational scenario, during initial operations, each amplifier sub-system separately pre-distorts its input signal based on only its own output signal. After pre-distortion has settled, one of the amplifier sub-systems is switched to pre-distort its input signal based on the combined output signal, while the other amplifier sub-systems continue to pre-distort their input single based on only their own output signals.

    Abstract translation: 在具有两个或多个不同放大器子系统的放大器系统中，至少一个放大器子系统的输入信号是基于来自两个或更多个放大器子系统的组合输出信号而被预失真的。 在一个实施例中，每个其他放大器子系统仅基于其自己的输出信号来预失真其输入信号。 在一个操作场景中，在初始操作期间，每个放大器子系统仅基于其自己的输出信号单独地预失真其输入信号。 在预失真已经稳定之后，其中一个放大器子系统被切换为基于组合的输出信号对其输入信号进行预失真，而另一个放大器子系统仅基于自己的输入单元继续预失真其输入单 输出信号。

    Television transmitter employing klystron with nonlinearity correction circuit
    24.
    发明授权
    Television transmitter employing klystron with nonlinearity correction circuit 失效
    电视发射机采用速调管与非线性校正电路

    公开(公告)号：US4905086A

    公开(公告)日：1990-02-27

    申请号：US278185

    申请日：1988-11-30

    Applicant: Noboru Tahara

    Inventor： Noboru Tahara

    IPC: H03F1/32 ,  H03F3/56 ,  H03G3/20 ,  H04N5/38

    CPC classification number: H03G3/22 ,  H03F1/3247 ,  H03F3/56 ,  H04N5/38 ,  H03F2201/3227

    Abstract: A television transmitter includes a klystron power amplifier, a non-linearity pre-correction circuit in a stage preceding the klystron power amplifier, a non-linearity detection circuit for detecting the non-linearity of the output of the klystron power amplifier, a first level controlling circuit for controlling the level of the output of the non-linearity pre-correction circuit in response to the output of the non-linearity detection circuit, a hum frequency component detection circuit for detecting a hum frequency component of the output of the klystron power amplifier and a second level controlling circuit for controlling the level of either the input or the output of the non-linearity pre-correction circuit in response to the detected hum frequency component. The first and second level controlling level circuits are preferably variable attenuators. Preferably, the hum component detection circuit is an AGC circuit, which preferably detects the pedestal level in the output of the power amplifier, and then applies the detected level to a bandpass filter which passes a component of substantially 50 to 60 Hz contained in the pedestal level. A comparator compares the output of the bandpass filter against a reference level and generates an error signal, which is employed to control the second variable attenuator, which is either at the input or the output of the pre-correction circuit.

    Abstract translation: 电视发射机包括速调管功率放大器，在速调管功率放大器之前的阶段中的非线性预校正电路，用于检测速调管功率放大器的输出的非线性的非线性检测电路，第一级 控制电路，用于响应于非线性检测电路的输出来控制非线性预校正电路的输出电平;哼声频率分量检测电路，用于检测速调管功率输出的嗡嗡声频率分量 放大器和第二电平控制电路，用于响应于检测到的嗡嗡声频率分量来控制非线性预校正电路的输入或输出的电平。 第一和第二电平控制电平电路优选地是可变衰减器。 优选地，哼声分量检测电路是AGC电路，其优选地检测功率放大器的输出中的基座电平，然后将检测到的电平施加到带通滤波器，该带通滤波器通过包含在基座中的基本上为50至60Hz的分量 水平。 比较器将带通滤波器的输出与参考电平进行比较，并产生误差信号，该误差信号用于控制第二可变衰减器，该第二可变衰减器处于预校正电路的输入端或输出端。

    Method and system of linearization for non-linear system
    25.
    发明授权
    Method and system of linearization for non-linear system 有权

    公开(公告)号：US11888449B2

    公开(公告)日：2024-01-30

    申请号：US17781758

    申请日：2020-12-04

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： Haiying Cao ,  Jessica Chani ,  Per Landin ,  Shoaib Amin ,  Rui Hou ,  Mohamed Hamid

    IPC: H03F1/32 ,  H03F3/189 ,  H03F3/24

    CPC classification number: H03F1/3247 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/451 ,  H03F2201/3227

    Abstract: The present disclosure provides a method of linearization for a non-linear system, comprising: a group of steps comprising: inputting an input signal to the non-linear system; obtaining an output signal from the non-linear system in response to the input signal being input to the non-linear system; obtaining a desired signal for the non-linear system; comparing the output signal with the desired signal, to determine whether the input signal is a target signal for the non-linear system to achieve a desired performance; and in response to determining that the input signal is not the target signal for the non-linear system to achieve the desired performance, generating an updated signal in frequency domain by applying a coefficient to eliminate a difference between the output signal and the desired signal, for updating the input signal to the non-linear system. The present disclosure also provides a corresponding device, computer programs, and computer-readable storage.

    DIGITAL PREDISTORTION FOR MULTIPLE POWER AMPLIFIERS
    26.
    发明申请
    DIGITAL PREDISTORTION FOR MULTIPLE POWER AMPLIFIERS 审中-公开

    公开(公告)号：US20180191314A1

    公开(公告)日：2018-07-05

    申请号：US15856985

    申请日：2017-12-28

    Applicant: Patrick Pratt ,  Rafael Celedon

    Inventor： Patrick Pratt ,  Rafael Celedon

    IPC: H03F3/21 ,  H03F1/32 ,  H03F3/193

    CPC classification number: H03F3/211 ,  H03F1/0233 ,  H03F1/0277 ,  H03F1/3247 ,  H03F1/3252 ,  H03F3/19 ,  H03F3/193 ,  H03F3/602 ,  H03F2201/3215 ,  H03F2201/3227

    Abstract: Various examples are directed to a power amplifier circuit, comprising a digital predistortion circuit, first and second power amplifiers, and a bias feedback circuit. The digital predistortion circuit may be configured to generate a predistorted input signal based at least in part on an input signal. The first power amplifier may be configured to generate a first amplified signal based at least in part on the predistorted input signal. The second power amplifier may be configured to generate a second amplified signal based at least in part on the predistorted input signal. The bias feedback circuit may be configured to adjust at least one of a bias of the first power amplifier or a bias of the second power amplifier to align a first nonlinear behavior of the first power amplifier with a second nonlinear behavior of the second power amplifier.

    AMPLIFICATION APPARATUS
    29.
    发明申请
    AMPLIFICATION APPARATUS 审中-公开

    公开(公告)号：US20170288709A1

    公开(公告)日：2017-10-05

    申请号：US15468978

    申请日：2017-03-24

    Applicant: FUJITSU LIMITED

    Inventor： Yuichi Utsunomiya

    IPC: H04B1/04 ,  H03F1/32 ,  H03F1/02 ,  H04W52/52

    CPC classification number: H04B1/0475 ,  H03F1/0288 ,  H03F1/3247 ,  H03F2201/3227 ,  H04B2001/045 ,  H04W52/346 ,  H04W52/52

    Abstract: An amplification apparatus includes a separator configured to separate an input signal into a first signal and a second signal, a first and second amplifiers amplify the first and second signal, a storage, and a processor coupled to the storage and configured to adjust a phase of the second signal on the basis of a first phase value corresponding to a power value of the input signal or a second phase value set within a period in which the first phase value is updated, calculate a power value of an output signal that is synthesis of an output of the first amplifier and an output of the second amplifier, and update the first phase value to the second phase value after the change of the power value of the calculated output signal when the first phase value is the power value of the input signal.

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