公开(公告)号：US08170507B2

公开(公告)日：2012-05-01

申请号：US12260832

申请日：2008-10-29

申请人： Yongtao Wang ,  Khurram Waheed ,  Sameh S. Rezeq ,  Jaimin Mehta ,  Prasad Srinivasan ,  Khurram Muhammad

发明人： Yongtao Wang ,  Khurram Waheed ,  Sameh S. Rezeq ,  Jaimin Mehta ,  Prasad Srinivasan ,  Khurram Muhammad

IPC分类号： H04B1/04

CPC分类号： H03F3/24 ,  H03F1/3241 ,  H03F3/72 ,  H04B2001/0425

摘要： Predistortion methods and apparatus for transmitter linearization in a communication transceiver are disclosed. An example apparatus to linearize a digitally controlled pre-power amplifier included in a transmitter of a communication transceiver disclosed herein comprises a predistorter to predistort an input signal to be processed by the digitally controlled pre-power amplifier, a coupling path within the communication transceiver to couple an output of the digitally controlled pre-power amplifier to an input of a receiver included in the communication transceiver without enabling an output power amplifier stage of a multi-stage power amplifier coupled to an output of the digitally controlled pre-power amplifier, wherein no additional hardware components are required to implement the coupling path within the communication transceiver, and a predistortion evaluator comprising a predistortion calibrator and a predistortion compensator to process data demodulated by the receiver to generate and update predistortion values for use by the predistorter.

摘要翻译： 公开了用于通信收发器中的发射机线性化的预失真方法和装置。 线性化包括在本文公开的通信收发器的发射机中的数字控制的预功率放大器的示例性装置包括预失真器，用于预失真由数字控制的预功率放大器处理的输入信号，通信收发器内的耦合路径 将数字控制的预功率放大器的输出耦合到通信收发器中包括的接收器的输入，而不使能耦合到数字控制的预功率放大器的输出的多级功率放大器的输出功率放大器级，其中 不需要额外的硬件组件来实现通信收发信机内的耦合路径，以及预失真评估器，包括预失真校准器和预失真补偿器，用于处理由接收机解调的数据，以生成和更新预失真值供预失真器使用。

公开(公告)号：US07808325B2

公开(公告)日：2010-10-05

申请号：US12326569

申请日：2008-12-02

申请人： Khurram Waheed ,  Khurram Muhammad ,  Jingcheng Zhuang

发明人： Khurram Waheed ,  Khurram Muhammad ,  Jingcheng Zhuang

IPC分类号： H03L7/085

CPC分类号： H03L7/099 ,  H03L2207/50

摘要： A system and method for frequency pushing/pulling compensation in phase-locked loops including a method for cancelling frequency push/pull in an oscillator of a transmitter. The method includes computing an error signal from a signal of a phase locked loop, wherein the error signal includes an aggressor signal. Transfer characteristics are computed for the aggressor signal. A transmitted signal is filtered using the transfer characteristics to produce a correction term. The correction term is applied to a frequency control word being provided to the oscillator.

摘要翻译： 一种用于在锁相环中频率推/拉补偿的系统和方法，包括用于消除发射机振荡器中的频率推/拉的方法。 该方法包括从锁相环的信号计算误差信号，其中误差信号包括侵略者信号。 对侵略者信号计算传输特性。 使用传输特性对传输的信号进行滤波以产生校正项。 校正项被应用于提供给振荡器的频率控制字。

公开(公告)号：US20100105338A1

公开(公告)日：2010-04-29

申请号：US12260832

申请日：2008-10-29

申请人： Yongtao Wang ,  Khurram Waheed ,  Sameh S. Rezeq ,  Jaimin Mehta ,  Prasad Srinivasan ,  Khurram Muhammad

发明人： Yongtao Wang ,  Khurram Waheed ,  Sameh S. Rezeq ,  Jaimin Mehta ,  Prasad Srinivasan ,  Khurram Muhammad

IPC分类号： H04B1/62 ,  H03F1/32 ,  H04B1/40

CPC分类号： H03F3/24 ,  H03F1/3241 ,  H03F3/72 ,  H04B2001/0425

摘要： Predistortion methods and apparatus for transmitter linearization in a communication transceiver are disclosed. An example apparatus to linearize a digitally controlled pre-power amplifier included in a transmitter of a communication transceiver disclosed herein comprises a predistorter to predistort an input signal to be processed by the digitally controlled pre-power amplifier, a coupling path within the communication transceiver to couple an output of the digitally controlled pre-power amplifier to an input of a receiver included in the communication transceiver without enabling an output power amplifier stage of a multi-stage power amplifier coupled to an output of the digitally controlled pre-power amplifier, wherein no additional hardware components are required to implement the coupling path within the communication transceiver, and a predistortion evaluator comprising a predistortion calibrator and a predistortion compensator to process data demodulated by the receiver to generate and update predistortion values for use by the predistorter.

摘要翻译： 公开了用于通信收发器中的发射机线性化的预失真方法和装置。 线性化包括在本文公开的通信收发器的发射机中的数字控制的预功率放大器的示例性装置包括预失真器，用于预失真由数字控制的预功率放大器处理的输入信号，通信收发器内的耦合路径 将数字控制的预功率放大器的输出耦合到通信收发器中包括的接收器的输入，而不使能耦合到数字控制的预功率放大器的输出的多级功率放大器的输出功率放大器级，其中 不需要额外的硬件组件来实现通信收发信机内的耦合路径，以及预失真评估器，包括预失真校准器和预失真补偿器，用于处理由接收机解调的数据，以生成和更新预失真值供预失真器使用。

公开(公告)号：US20080205571A1

公开(公告)日：2008-08-28

申请号：US11967984

申请日：2007-12-31

申请人： Khurram Muhammad ,  Khurram Waheed

发明人： Khurram Muhammad ,  Khurram Waheed

IPC分类号： H04L7/00

CPC分类号： H04L27/367 ,  H04L27/361

摘要： A system and method for time aligning signals in transmitters. A transmitter includes a first signal path coupled to a first data input, a second signal path coupled to a second data input, an error signal energy source coupled to the first and second signal paths, the error signal energy source generates an error signal responsive to a time alignment difference between a first data stream and a second data stream, a time alignment circuit coupled to the error signal energy source, to the first and second data inputs, the time alignment circuit generates a digital control word responsive to the error signal, to the first and second data streams, and a timing adjust unit coupled to the time alignment circuit, to the first and second signal paths, the timing adjust unit inserts a delay proportional to the digital control word in either signal paths.

摘要翻译： 用于在发射机中时间对准信号的系统和方法。 发射机包括耦合到第一数据输入的第一信号路径，耦合到第二数据输入的第二信号路径，耦合到第一和第二信号路径的误差信号能量源，误差信号能量源产生响应于 第一数据流和第二数据流之间的时间对准差，耦合到误差信号能量源的时间对准电路到第一和第二数据输入，时间对准电路响应于误差信号产生数字控制字， 第一和第二数据流以及与时间对准电路耦合到第一和第二信号路径的定时调整单元，定时调整单元在任一信号路径中插入与数字控制字成比例的延迟。

公开(公告)号：US20090268791A1

公开(公告)日：2009-10-29

申请号：US12326569

申请日：2008-12-02

申请人： Khurram Waheed ,  Khurram Muhammad ,  Jingcheng Zhuang

发明人： Khurram Waheed ,  Khurram Muhammad ,  Jingcheng Zhuang

IPC分类号： H04B1/38 ,  H04B1/04

CPC分类号： H03L7/099 ,  H03L2207/50

摘要： A system and method for frequency pushing/pulling compensation in phase-locked loops including a method for cancelling frequency push/pull in an oscillator of a transmitter. The method includes computing an error signal from a signal of a phase locked loop, wherein the error signal includes an aggressor signal. Transfer characteristics are computed for the aggressor signal. A transmitted signal is filtered using the transfer characteristics to produce a correction term. The correction term is applied to a frequency control word being provided to the oscillator.

摘要翻译： 一种用于在锁相环中频率推/拉补偿的系统和方法，包括用于消除发射机振荡器中的频率推/拉的方法。 该方法包括从锁相环的信号计算误差信号，其中误差信号包括侵略者信号。 对侵略者信号计算传输特性。 使用传输特性对传输的信号进行滤波以产生校正项。 校正项被应用于提供给振荡器的频率控制字。

公开(公告)号：US09088320B2

公开(公告)日：2015-07-21

申请号：US13688609

申请日：2012-11-29

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H04B1/04 ,  H03F1/32

CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H04B2001/0425

摘要： Aspects of the disclosure provide a transmitter that includes a pre-distortion module and a phase controller. The pre-distortion module is configured to receive a first digital value and generate a first pre-distorted digital value based on the first digital value and a corresponding angle. The first digital value is a combination of an in-phase component and a quadrature component of a signal for transmission. The phase controller is configured to control an amplifier to drive a current according to the first pre-distorted digital value and phase information in relation to the first digital value during a first phase range of a carrier signal determined at least partially based on the angle.

摘要翻译： 本公开的方面提供了包括预失真模块和相位控制器的发射机。 预失真模块被配置为接收第一数字值并且基于第一数字值和相应的角度生成第一预失真数字值。 第一数字值是用于传输的信号的同相分量和正交分量的组合。 相位控制器被配置为在至少部分地基于角度确定的载波信号的第一相位范围内，根据第一预失真数字值和相对于第一数字值的相位信息来控制放大器来驱动电流。

公开(公告)号：US08792831B2

公开(公告)日：2014-07-29

申请号：US13225762

申请日：2011-09-06

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H04B1/00 ,  H04B7/14

CPC分类号： H04B15/04

摘要： A mobile wireless communications device includes a transceiver comprising a transmitter and a receiver, an auxiliary receiver, and a controller. The transmitter is configured to upconvert a transmit baseband modulated signal and generate an RF modulated signal having a transmit impairment. The auxiliary receiver is configured to downconvert the RF modulated signal and generate a receive baseband modulated signal having the transmit impairment. The auxiliary receiver is selectively configured to operate based on a control signal in a single-mixer mode when the transmitter is selectively configured to operate in a dual-mixer mode, and in the dual-mixer mode when the transmitter is selectively configured to operate in the single-mixer mode. The controller is configured to compare the transmit baseband modulated signal to the transmit impairment to determine an error difference therebetween, and generate the control signal based on the error difference.

摘要翻译： 移动无线通信设备包括收发器，包括发射机和接收机，辅助接收机和控制器。 发射机被配置为上变频发射基带调制信号并产生具有发射损伤的RF调制信号。 辅助接收机被配置为下变频RF调制信号并产生具有发射损伤的接收基带调制信号。 辅助接收机被选择性地配置为当发射机被选择性地配置为以双混频器模式工作时，并且当发射机被选择性地配置为在双混频器模式中操作时，基于单个混频器模式中的控制信号进行操作 单混音模式。 控制器被配置为将发射基带调制信号与发射损伤进行比较以确定它们之间的误差，并且基于误差产生控制信号。

公开(公告)号：US08553802B2

公开(公告)日：2013-10-08

申请号：US13049200

申请日：2011-03-16

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H04L27/00

CPC分类号： H04L27/363 ,  H03L7/1974 ,  H04L27/2067 ,  H04L2027/0018

摘要： A communications device may include an In-phase (I) power amplifier configured to generate an I amplified signal, a Quadrature (Q) power amplifier configured to generate a Q amplified signal, an I digital-to-analog converter (DAC) configured to generate an I signal, and a Q DAC configured to generate a Q signal. The communications device may also include an I power supply circuit coupled to the I power amplifier and to the I DAC and configured to cause the I power amplifier to modulate an I carrier signal into the I amplified signal based upon the I signal, a Q power supply circuit coupled to the Q power amplifier and to the Q DAC and configured to cause the Q power amplifier to modulate a Q carrier signal into the Q amplified signal based upon the Q signal, and at least one antenna coupled to the I and Q power amplifiers.

摘要翻译： 通信设备可以包括被配置为产生I放大信号的同相（I）功率放大器，被配置为产生Q放大信号的正交（Q）功率放大器，被配置为 产生I信号和配置成产生Q信号的Q DAC。 通信设备还可以包括耦合到I功率放大器和I DAC的I电源电路，并且被配置为使得I功率放大器基于I信号将I载波信号调制成I放大信号，Q功率 电源电路耦合到Q功率放大器和Q DAC，并被配置为使得Q功率放大器基于Q信号将Q载波信号调制到Q放大信号中，并且至少一个天线耦合到I和Q功率 放大器

公开(公告)号：US08462030B2

公开(公告)日：2013-06-11

申请号：US10832531

申请日：2004-04-27

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H03M3/00

CPC分类号： H03M3/396 ,  H03M3/392 ,  H03M3/43

摘要： The present invention is directed to a programmable loop filter, a method of programming the same and a sigma delta analog-to-digital converter (ADC) incorporating the programmable loop filter or the method. In one embodiment, the programmable loop filter includes: (1) a configurable filter structure containing selectably interconnectable alternative filter elements and (2) a configuration controller coupled to the configurable filter structure and operable to interconnect at least a selected one of the filter elements to determine a transfer characteristic of the configurable filter structure and set an operating condition of the sigma delta ADC.

摘要翻译： 本发明涉及一种可编程环路滤波器，其编程方法以及结合有可编程环路滤波器或该方法的Σ-Δ模数转换器（ADC）。 在一个实施例中，可编程环路滤波器包括：（1）包含可选择地互连的替代滤波器元件的可配置滤波器结构，以及（2）耦合到可配置滤波器结构并且可操作以将至少一个所选滤波器元件互连到 确定可配置滤波器结构的传输特性并设置Σ-ΔADC的工作状态。

公开(公告)号：US08391806B2

公开(公告)日：2013-03-05

申请号：US12984170

申请日：2011-01-04

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H04B1/02 ,  H04K3/00

CPC分类号： H04B1/0458

摘要： A mobile wireless communications device includes a portable housing, a transmitter carried by the portable housing and configured to modulate an input signal, and an adjustable impedance matching network coupled downstream from the transmitter. An antenna is coupled downstream from the adjustable impedance matching network, and a non-directional coupler is coupled between the adjustable impedance matching network and the antenna. A feedback receiver is coupled to the non-directional coupler to generate a feedback signal. A controller is configured to control the adjustable impedance matching network based upon the input signal and the feedback signal.

摘要翻译： 移动无线通信设备包括便携式外壳，由便携式外壳承载并被配置为调制输入信号的发射机以及耦合到发射机下游的可调阻抗匹配网络。 天线被耦合在可调阻抗匹配网络的下游，并且非定向耦合器耦合在可调阻抗匹配网络和天线之间。 反馈接收器耦合到非定向耦合器以产生反馈信号。 控制器被配置为基于输入信号和反馈信号来控制可调阻抗匹配网络。