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    Front-End Module And Coupling Compensation For Closed-Loop Digital Pre-Distortion System
    11.
    发明申请
    Front-End Module And Coupling Compensation For Closed-Loop Digital Pre-Distortion System 审中-公开
    闭环数字预失真系统的前端模块和耦合补偿

    公开(公告)号：US20160105299A1

    公开(公告)日：2016-04-14

    申请号：US14972038

    申请日：2015-12-16

    Applicant: MediaTek Inc.

    Inventor： YuenHui Chee ,  Fei Song ,  James Wang ,  Toru Matsuura ,  Osama K.A. Shana'a ,  Chiyuan Lu

    IPC: H04L27/00 ,  H03F3/21 ,  H03F1/02 ,  H03F3/19 ,  H04L25/08 ,  H04B1/40

    CPC classification number: H04L27/0002 ,  H03F1/0205 ,  H03F1/3241 ,  H03F1/3247 ,  H03F3/189 ,  H03F3/19 ,  H03F3/20 ,  H03F3/245 ,  H03F2200/294 ,  H03F2200/451 ,  H03F2201/3236 ,  H04B1/0475 ,  H04B1/40 ,  H04B2001/0425 ,  H04L25/08 ,  H04L27/36 ,  H04L27/368

    Abstract: Examples of front-end modules, apparatuses and methods for coupling compensation in a closed-loop digital pre-distortion (DPD) system are described. The closed-loop DPD circuit may include a PA and a loopback path. The PA may receive a PA input signal and amplify the PA input signal to provide a PA output signal proportional to a product of the PA input signal and a gain of the PA. The loopback path may receive the PA output signal to output a loopback signal. A forward coupling and a backward coupling may exist between the PA input signal and an output of the loopback path. The output of the loopback path may be proportional to a product of the PA output signal and a gain of the loopback path. The loopback path may include a coupling cancellation mechanism configured to cancel couplings between the PA input signal and the loopback signal.

    Abstract translation: 描述了用于在闭环数字预失真（DPD）系统中耦合补偿的前端模块，装置和方法的示例。 闭环DPD电路可以包括PA和环回路径。 PA可以接收PA输入信号并放大PA输入信号，以提供与PA输入信号的乘积和PA的增益成比例的PA输出信号。 环回路径可以接收PA输出信号以输出环回信号。 在PA输入信号和环回路径的输出之间可能存在正向耦合和反向耦合。 环回路径的输出可能与PA输出信号与环回路径的增益的乘积成比例。 环回路径可以包括被配置为消除PA输入信号和环回信号之间的耦合的耦合消除机构。

    Method for generating a signal with a definable pulse shape
    12.
    发明授权
    Method for generating a signal with a definable pulse shape 有权
    用于产生具有可定义的脉冲形状的信号的方法

    公开(公告)号：US07433422B2

    公开(公告)日：2008-10-07

    申请号：US11108689

    申请日：2005-04-19

    Applicant: Sven Luecke ,  Andreas Salomon

    Inventor： Sven Luecke ,  Andreas Salomon

    IPC: H04L25/03

    CPC classification number: H03K5/01 ,  H03F1/3241 ,  H03F3/24 ,  H03F2201/3236 ,  H03K4/026

    Abstract: In a method of generating a pulse-shaped transmitted output signal having a definable pulse shape in a multistage amplifier arrangement, the course of the “pulse top” (upper edge) of the transmitted signal is determined by control signals at the amplifier stages. The control signals of the amplifier stages are definable such that the control signal of an amplifier stage in each case comprises a number of pulse sections of a predefinable frame pulse. The tops of the pulse sections each having a predefinable constant gradient. A predistortion is introduced into the control signals in this manner, having a course which offsets distortion of the pulse top which results when no predistortion is used.

    Abstract translation: 在多级放大器装置中产生具有可定义脉冲形状的脉冲状发送输出信号的方法中，发射信号的“脉冲顶部”（上边沿）的过程由放大器级的控制信号确定。 放大器级的控制信号是可定义的，使得放大器级的控制信号在每种情况下都包括多个预定义帧脉冲的脉冲段。 脉冲部分的顶部各自具有预定义的恒定梯度。 以这种方式将预失真引入到控制信号中，具有补偿当不使用预失真时产生的脉冲顶部失真的过程。

    Systems and Methods for Improving Performance in a Digital Amplifier by Adding an Ultrasonic Signal to an Input Audio Signal
    13.
    发明申请
    Systems and Methods for Improving Performance in a Digital Amplifier by Adding an Ultrasonic Signal to an Input Audio Signal 失效
    通过向输入音频信号添加超声波信号来提高数字放大器性能的系统和方法

    公开(公告)号：US20070170984A1

    公开(公告)日：2007-07-26

    申请号：US11626569

    申请日：2007-01-24

    Applicant: Jack B. Andersen ,  Peter G. Craven

    Inventor： Jack B. Andersen ,  Peter G. Craven

    IPC: H03F3/38

    CPC classification number: H03F3/217 ,  H03F1/3264 ,  H03F3/2173 ,  H03F2200/03 ,  H03F2200/114 ,  H03F2200/351 ,  H03F2201/3236 ,  H03K17/162 ,  H03K17/6871

    Abstract: Systems and methods in which an ultrasonic signal is introduced into an audio signal before the audio signal is amplified by a switching amplifier. The added ultrasonic signal (e.g., a tone at half the amplifier's switching frequency) shifts the signals input to a set of power switches so that they do not switch nearly simultaneously. The ultrasonic signal causes the output current to be well defined to eliminate dead time distortion at low signal levels. Adding the tone ultrasonic signal causes the distortion to shift to an amplitude greater than zero. Signals that exceed this amplitude will experience the distortion, but the distortion will be less noticeable than in lower-amplitude signals. Signals that do not exceed this amplitude will not experience the distortion at all. Adding an ultrasonic signal may also draw energy away from the switch frequency and its harmonics to interference with AM radio reception.

    Abstract translation: 在音频信号被开关放大器放大之前，将超声波信号引入到音频信号中的系统和方法。 增加的超声波信号（例如，放大器开关频率的一半处的音调）将输入的信号移动到一组电源开关，使得它们几乎不同时切换。 超声波信号使得输出电流被良好地定义，以消除低信号电平下的死区失真。 增加音调超声信号会导致失真转移到大于零的幅度。 超过该幅度的信号将经历失真，但是失真比在较低幅度信号中更不明显。 不超过此幅度的信号根本不会出现失真。 添加超声波信号也可能会从开关频率及其谐波中吸收能量，从而干扰AM无线电接收。

    Signal notching system for limiting signal peaks
    14.
    发明授权
    Signal notching system for limiting signal peaks 有权
    用于限制信号峰值的信号开槽系统

    公开(公告)号：US06654427B1

    公开(公告)日：2003-11-25

    申请号：US09363329

    申请日：1999-07-28

    Applicant: Zhengxiang Ma ,  Paul Anthony Polakos

    Inventor： Zhengxiang Ma ,  Paul Anthony Polakos

    IPC: H04L2503

    CPC classification number: H03F1/3241 ,  H03F2201/3236 ,  H04B1/0475

    Abstract: A signal notching system reduces signal peaks by notching the peak of a signal above a threshold to produce a notched signal. The notched signal is then filtered to produce a resulting signal with a reduced peak amplitude. For example, in an implementation where the signal is represented by signal samples, the peak notching system first locates a peak sample that is beyond a threshold, such as a sample representing a positive peak sample of a peak above the threshold. Once a peak sample is located, the peak notching system adjusts the peak sample by an amount which is a function of the amount that the peak sample is beyond the threshold, effectively creating a notched signal with a one sample notch at the peak. The peak notching system filters the notched signal to fill in the notch to produce a signal with a reduced peak.

    Abstract translation: 信号切口系统通过在高于阈值的情况下切断信号的峰值来减小信号峰值，以产生陷波信号。 然后对切口信号进​​行滤波以产生具有减小的峰值幅度的结果信号。 例如，在信号由信号样本表示的实施例中，峰值切口系统首先定位超过阈值的峰值样本，例如表示高于阈值的峰值的正峰值样本的样本。 一旦找到峰值样本，峰值切口系统将峰值采样值调整为峰值采样超过阈值的量的函数，有效地创建峰值处的一个采样缺口的缺口信号。 峰值切口系统对陷波信号进行滤波以填充陷波，产生峰值降低的信号。

    CASCADE AMPLIFIER LINEARIZATION IN A RADIO FREQUENCY SYSTEM
    17.
    发明申请
    CASCADE AMPLIFIER LINEARIZATION IN A RADIO FREQUENCY SYSTEM 审中-公开
    无线电频率系统中的CASCADE放大器线性化

    公开(公告)号：US20170005626A1

    公开(公告)日：2017-01-05

    申请号：US15191962

    申请日：2016-06-24

    Applicant: Skyworks Solutions, Inc.

    Inventor： Yu Zhu ,  Dylan Charles Bartle ,  Oleksiy Klimashov ,  Paul T. DiCarlo

    IPC: H03F1/32 ,  H04B1/48 ,  H03F3/19 ,  H03F3/24 ,  H03F3/193

    CPC classification number: H03F1/3205 ,  H03F1/0266 ,  H03F1/32 ,  H03F3/19 ,  H03F3/193 ,  H03F3/195 ,  H03F3/211 ,  H03F3/245 ,  H03F3/4508 ,  H03F3/45179 ,  H03F2200/102 ,  H03F2200/105 ,  H03F2200/15 ,  H03F2200/294 ,  H03F2200/451 ,  H03F2201/3215 ,  H03F2201/3236 ,  H04B1/3827 ,  H04B1/40 ,  H04B1/48 ,  H04B1/525 ,  H04B2001/485 ,  H04W88/02

    Abstract: A linearization circuit reduces intermodulation distortion in a cascade amplifier that includes a first stage and a second stage. The linearization circuit receives a first signal that includes a first frequency and a second frequency and generates a difference signal having a frequency approximately equal to the difference of the first frequency and the second frequency, generates an envelope signal based at least in part on a power level of the first signal, and adjusts a magnitude of the difference signal based on the envelope signal. When the cascade amplifier receives the first signal at an input terminal, the first stage receives the adjusted signal, and the second stage does not receive the adjusted signal, intermodulation between the adjusted signal and the first signal cancels at least a portion of the intermodulation between the first frequency and the second frequency from the output of the cascade amplifier.

    Abstract translation: 线性化电路减少了包括第一级和第二级的级联放大器中的互调失真。 线性化电路接收包括第一频率和第二频率的第一信号，并产生具有大致等于第一频率和第二频率的差的频率的差分信号，至少部分地基于功率产生包络信号 电平，并且基于包络信号来调整差分信号的幅度。 当级联放大器在输入端接收到第一信号时，第一级接收经调整的信号，第二级不接收经调整的信号，调整后的信号与第一信号之间的互调消除了至少一部分互调之间的互调， 第一个频率和第二个频率从级联放大器的输出。

    HIGH EFFICIENCY RADIO FREQUENCY POWER AMPLIFIER CIRCUITRY WITH REDUCED DISTORTION
    19.
    发明申请
    HIGH EFFICIENCY RADIO FREQUENCY POWER AMPLIFIER CIRCUITRY WITH REDUCED DISTORTION 有权
    具有降低失真的高效无线电频率放大器电路

    公开(公告)号：US20150145604A1

    公开(公告)日：2015-05-28

    申请号：US14554774

    申请日：2014-11-26

    Applicant: RF Micro Devices, Inc.

    Inventor： Baker Scott ,  George Maxim ,  Dirk Robert Walter Leipold

    IPC: H03F1/02 ,  H03F3/21 ,  H03F3/19

    CPC classification number: H03G3/3036 ,  H03F1/0211 ,  H03F1/0272 ,  H03F1/223 ,  H03F1/32 ,  H03F1/523 ,  H03F1/565 ,  H03F3/19 ,  H03F3/193 ,  H03F3/24 ,  H03F3/45179 ,  H03F3/45394 ,  H03F3/68 ,  H03F2200/324 ,  H03F2200/387 ,  H03F2200/451 ,  H03F2200/471 ,  H03F2201/3236 ,  H03G3/3042 ,  H04B1/0475 ,  H04B2001/0408 ,  H04B2001/0416 ,  H04B2001/0425

    Abstract: Radio frequency power amplifier circuitry includes an amplifier element, power supply modulation circuitry, and bias modulation circuitry. The amplifier element is configured to amplify an RF input signal using a modulated power supply signal and a modulated bias signal to produce an RF output signal. The power supply modulation circuitry is coupled to the amplifier element and configured to provide the modulated power supply signal. The bias modulation circuitry is coupled to the amplifier element and the power supply modulation circuitry and configured to receive the modulated power supply signal and provide the modulated bias signal. Notably, the modulated bias signal is a function of the modulated power supply signal such that the modulated bias signal is configured to maintain a small signal gain of the amplifier element and the phase of the RF input signal at a constant value as the modulated power supply signal changes.

    Abstract translation: 射频功率放大器电路包括放大器元件，电源调制电路和偏置调制电路。 放大器元件被配置为使用调制的电源信号和调制的偏置信号来放大RF输入信号以产生RF输出信号。 电源调制电路耦合到放大器元件并且被配置为提供调制电源信号。 偏置调制电路耦合到放大器元件和电源调制电路，并被配置为接收经调制的电源信号并提供经调制的偏置信号。 值得注意的是，调制偏置信号是调制电源信号的函数，使得调制偏置信号被配置为将放大器元件的小信号增益和RF输入信号的相位保持在恒定值，作为调制电源 信号变化。

    Clipping of transmission signal
    20.
    发明授权
    Clipping of transmission signal 有权
    剪切传输信号

    公开(公告)号：US07643801B2

    公开(公告)日：2010-01-05

    申请号：US11074006

    申请日：2005-03-08

    Applicant: Olli Piirainen

    Inventor： Olli Piirainen

    IPC: H04B1/04

    CPC classification number: H04L27/2623 ,  H03F1/0205 ,  H03F1/32 ,  H03F2201/3236 ,  H04B1/04 ,  H04B2001/0416

    Abstract: A transmitter clips a transmission signal before transmission in order to reduce the strength of at least one peak of the transmission signal exceeding a predetermined threshold. The transmitter includes a clipper having a minimizer, a filter and an adder. The minimizer minimizes of a cost function with respect to an optimization signal, the cost function having weighted terms as a function of the optimization signal. The terms relate to an effective modulation distortion and an effective overshoot exceeding the predetermined threshold. The filter forms a clipping signal by filtering the optimization signal formed as a result of the minimization according to the spectrum emission mask requirements of the radio system. The adder subtracts the clipping signal from the transmission signal.

    Abstract translation: 发射机在传输之前剪切传输信号，以便减少超过预定阈值的传输信号的至少一个峰值的强度。 发射机包括具有最小化器，滤波器和加法器的限幅器。 最小化器相对于优化信号最小化成本函数，成本函数具有作为优化信号的函数的加权项。 这些术语涉及超过预定阈值的有效调制失真和有效超调。 滤波器通过根据无线电系统的频谱发射掩模要求对作为最小化的结果形成的优化信号进行滤波来形成限幅信号。 加法器从发送信号中减去削波信号。

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