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：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：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：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：US20100123466A1

公开(公告)日：2010-05-20

申请号：US12272008

申请日：2008-11-17

申请人： Yongtao Wang ,  Khurram Muhammad

发明人： Yongtao Wang ,  Khurram Muhammad

IPC分类号： G01R27/02

CPC分类号： H04B1/123

摘要： A system and method for corner frequency compensation in a wireless receiver. A method comprises computing a corner frequency of a filter, and determining if the computed corner frequency is different from a desired corner frequency by less than a threshold. The method further comprises if the computed corner frequency differs from the desired corner frequency by more than the threshold, adjusting parameters of the filter to alter the corner frequency, and repeating the computing and the determining. The method additionally comprises if the computed corner frequency differs from the desired corner frequency by less than the threshold, leaving the parameters of the filter unchanged. The computing uses a measured phase response of the filter at a frequency outside of a passband of the filter.

摘要翻译： 一种用于无线接收机中角落频率补偿的系统和方法。 一种方法包括计算滤波器的转角频率，以及确定计算出的转角频率是否与期望转角频率相差小于阈值。 该方法还包括如果所计算的转角频率与期望转角频率不同于阈值，则调整滤波器的参数以改变拐角频率，并重复计算和确定。 该方法还包括如果所计算的转角频率与期望转角频率不同于阈值，则保持滤波器的参数不变。 该计算使用滤波器在滤波器通带外的频率处的测量相位响应。

公开(公告)号：US20090170445A1

公开(公告)日：2009-07-02

申请号：US12049995

申请日：2008-03-17

申请人： Yongtao Wang ,  Khurram Muhammad

发明人： Yongtao Wang ,  Khurram Muhammad

IPC分类号： H04B1/40

CPC分类号： H04B1/1027 ,  H03J3/08 ,  H03J2200/32

摘要： A system and method for tuning baseband filters in wireless transceivers. A method comprises coupling a radio frequency (RF) signal generated by the wireless transmitter at an input of a wireless receiver, the RF signal having a desired frequency, measuring a magnitude of the coupled RF signal at an output of an analog-to-digital converter at an output of an analog baseband filter, wherein the magnitude is measured at the desired frequency, and adjusting a corner frequency of the analog baseband filter in response to the determining that the measured magnitude differs from a specified value.

摘要翻译： 一种用于调谐无线收发器中基带滤波器的系统和方法。 一种方法包括在无线接收机的输入处耦合由无线发射机产生的射频（RF）信号，所述RF信号具有期望的频率，在模数转换器的输出处测量耦合RF信号的幅度 转换器，其中所述幅度以期望的频率被测量，并且响应于确定所测量的幅度与指定值的不同而调整所述模拟基带滤波器的转角频率。

公开(公告)号：US07852247B2

公开(公告)日：2010-12-14

申请号：US11863999

申请日：2007-09-28

申请人： Khurram Muhammad ,  Yongtao Wang ,  Imtinan Elahi

发明人： Khurram Muhammad ,  Yongtao Wang ,  Imtinan Elahi

IPC分类号： H03M3/00

CPC分类号： H03M3/344 ,  H03M3/40 ,  H03M3/454 ,  H03M3/456

摘要： One embodiment of the invention includes a mixed-signal filter. The mixed-signal filter comprises an analog signal path configured to process a first analog signal and an analog-to-digital converter (ADC) configured to convert the processed first analog signal to a digital signal. The mixed-signal filter also comprises a programmable digital feedback filter configured to filter the digital signal and a digital-to-analog converter (DAC) configured to convert the filtered digital signal to a second analog signal. The mixed-signal filter further comprises a signal combiner configured to combine an analog input signal of the mixed-signal filter and the second analog signal to generate the first analog signal.

摘要翻译： 本发明的一个实施例包括混合信号滤波器。 混合信号滤波器包括被配置为处理第一模拟信号的模拟信号路径和被配置为将经处理的第一模拟信号转换为数字信号的模拟 - 数字转换器（ADC）。 混合信号滤波器还包括被配置为对数字信号进行滤波的可编程数字反馈滤波器和被配置为将经滤波的数字信号转换为第二模拟信号的数模转换器（DAC）。 混合信号滤波器还包括信号组合器，其被配置为组合混合信号滤波器的模拟输入信号和第二模拟信号以产生第一模拟信号。

公开(公告)号：US08428526B2

公开(公告)日：2013-04-23

申请号：US12049995

申请日：2008-03-17

申请人： Yongtao Wang ,  Khurram Muhammad

发明人： Yongtao Wang ,  Khurram Muhammad

IPC分类号： H04B1/04 ,  H04K3/00

CPC分类号： H04B1/1027 ,  H03J3/08 ,  H03J2200/32

摘要： A system and method for tuning baseband filters in wireless transceivers. A method comprises coupling a radio frequency (RF) signal generated by the wireless transmitter at an input of a wireless receiver, the RF signal having a desired frequency, measuring a magnitude of the coupled RF signal at an output of an analog-to-digital converter at an output of an analog baseband filter, wherein the magnitude is measured at the desired frequency, and adjusting a corner frequency of the analog baseband filter in response to the determining that the measured magnitude differs from a specified value.

摘要翻译： 一种用于调谐无线收发器中基带滤波器的系统和方法。 一种方法包括在无线接收机的输入处耦合由无线发射机产生的射频（RF）信号，所述RF信号具有期望的频率，在模数转换器的输出处测量耦合RF信号的幅度 转换器，其中所述幅度以期望的频率被测量，并且响应于确定所测量的幅度与指定值的不同而调整所述模拟基带滤波器的转角频率。

公开(公告)号：US20080129569A1

公开(公告)日：2008-06-05

申请号：US11863999

申请日：2007-09-28

申请人： Khurram Muhammad ,  Yongtao Wang ,  Imtinan Elahi

发明人： Khurram Muhammad ,  Yongtao Wang ,  Imtinan Elahi

IPC分类号： H03M1/12

CPC分类号： H03M3/344 ,  H03M3/40 ,  H03M3/454 ,  H03M3/456

摘要： One embodiment of the invention includes a mixed-signal filter. The mixed-signal filter comprises an analog signal path configured to process a first analog signal and an analog-to-digital converter (ADC) configured to convert the processed first analog signal to a digital signal. The mixed-signal filter also comprises a programmable digital feedback filter configured to filter the digital signal and a digital-to-analog converter (DAC) configured to convert the filtered digital signal to a second analog signal. The mixed-signal filter further comprises a signal combiner configured to combine an analog input signal of the mixed-signal filter and the second analog signal to generate the first analog signal.

摘要翻译： 本发明的一个实施例包括混合信号滤波器。 混合信号滤波器包括被配置为处理第一模拟信号的模拟信号路径和被配置为将经处理的第一模拟信号转换为数字信号的模拟 - 数字转换器（ADC）。 混合信号滤波器还包括被配置为对数字信号进行滤波的可编程数字反馈滤波器和被配置为将经滤波的数字信号转换为第二模拟信号的数模转换器（DAC）。 混合信号滤波器还包括信号组合器，其被配置为组合混合信号滤波器的模拟输入信号和第二模拟信号以产生第一模拟信号。