公开(公告)号：US20130095777A1

公开(公告)日：2013-04-18

申请号：US13273768

申请日：2011-10-14

申请人： Khurram Muhammad

发明人： Khurram Muhammad

IPC分类号： H04B1/02 ,  H04W52/08

CPC分类号： H04W52/52 ,  H03F1/34 ,  H03F3/24 ,  H04B1/04 ,  H04B2001/0416 ,  H04B2001/0433

摘要： Various embodiments include a method for controlling power in a transmitter, the method comprising measuring an indication of an output power of the transmitter, comparing a first value corresponding to the indication of the output power to a second value corresponding to a desired output power; and adjusting a bias of at least one component in the transmitter in order to bring the output power closer to the desired output power. Embodiments also include various methods, systems and apparatus.

摘要翻译： 各种实施例包括一种用于控制发射机功率的方法，所述方法包括测量发射机的输出功率的指示，将对应于输出功率的指示的第一值与对应于期望输出功率的第二值进行比较; 以及调整发射机中的至少一个分量的偏压，以使输出功率更接近所需的输出功率。 实施例还包括各种方法，系统和装置。

公开(公告)号：US08306480B2

公开(公告)日：2012-11-06

申请号：US12017372

申请日：2008-01-22

申请人： Khurram Muhammad ,  Imtinan Elahi

发明人： Khurram Muhammad ,  Imtinan Elahi

IPC分类号： H04B17/00

CPC分类号： H04B1/525

摘要： A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.

摘要翻译： 全双工收发器具有包括辅助接收器和辅助发射器的消除电路。 更具体地，包括传输信号泄漏的模拟接收信号被提供给低噪声放大器（LNA），低噪声放大器然后将其输出提供给主接收机和辅助接收机。 辅助接收机包括可操作以将接收到的信号从模拟域转换为数字域的部分。 辅助接收机还包括消除处理器，其确定传输信号泄漏并基于所确定的泄漏产生信号。 由辅助接收器产生的该信号被提供给辅助发射机，其将数字信号转换回模拟域并产生消除信号。 模拟消除信号被反馈并加到LNA的输入端的接收信号中。 作为包括辅助接收机和辅助发射机的反馈系统的结果，可以从接收到的信号中消除许多类型的传输信号泄漏。

公开(公告)号：US08045941B2

公开(公告)日：2011-10-25

申请号：US11847080

申请日：2007-08-29

申请人： Khurram Muhammad ,  Chandana Fernando

发明人： Khurram Muhammad ,  Chandana Fernando

IPC分类号： H04B7/00 ,  H04B17/00

CPC分类号： H03G3/3068 ,  H03G7/00

摘要： Methods and apparatus to implement receiver linearity enhancement are described. One example method includes controlling receiver gain by determining a level of a received signal that is to be provided to a radio frequency component; determining if the level of the received signal would cause the radio frequency components internally generated noise to increase; and when the level of the received signal would cause the radio frequency components internally generated noise to increase, reducing the level of the received signal prior to providing the received signal to the radio frequency component.

摘要翻译： 描述了实现接收机线性增强的方法和装置。 一个示例性方法包括通过确定要提供给射频分量的接收信号的电平来控制接收机增益; 确定接收信号的电平是否会导致射频分量内部产生的噪声增加; 并且当接收信号的电平将导致射频分量内部产生的噪声增加时，在将接收到的信号提供给射频分量之前，减小接收信号的电平。

公开(公告)号：US07904048B2

公开(公告)日：2011-03-08

申请号：US11935318

申请日：2007-11-05

申请人： Meng-Chang Lee ,  Khurram Muhammad

发明人： Meng-Chang Lee ,  Khurram Muhammad

IPC分类号： H04B1/10 ,  H03B1/00

CPC分类号： H04B1/1027 ,  H03H15/02 ,  H03H19/004 ,  H03H19/008

摘要： A multi-tap direct sub-sampling mixing system for wireless receivers is provided with a dynamically configurable passive switched capacitor filter. A front end amplifier is connected to receive a signal. The passive switched capacitor filter is connected to receive the amplified signal and has an output for providing a filtered signal. The switched capacitor filter has at least two sections that are each operable as a pole, wherein a first section of the at least two sections has sets of at least two stacked capacitors interconnected with a set of switches operable to amplify in input voltage provided to an input of the first section in response to operation of the set of switches; and a back end section connected to the output of the switched capacitor filter to receive the filtered signal.

摘要翻译： 无线接收器的多抽头直接子采样混合系统提供有动态可配置的无源开关电容滤波器。 连接前端放大器以接收信号。 无源开关电容滤波器被连接以接收放大的信号并具有用于提供滤波信号的输出。 开关电容器滤波器具有至少两个部分，每个部分可用作极点，其中至少两个部分的第一部分具有由一组开关互连的至少两个堆叠电容器组，其可操作以在提供给 响应于该组开关的操作而输入第一部分; 以及连接到开关电容滤波器的输出端以接收经滤波的信号的后端部分。

公开(公告)号：US07741916B2

公开(公告)日：2010-06-22

申请号：US12032317

申请日：2008-02-15

申请人： Salvatore Pennisi ,  Khurram Muhammad

发明人： Salvatore Pennisi ,  Khurram Muhammad

IPC分类号： H03F3/191

CPC分类号： H03F1/56 ,  H03F3/193 ,  H03F2200/294 ,  H03F2200/387 ,  H03F2200/492

摘要： A method for changing an effective capacitance of an amplifier circuit having a match transistor and a coupled cascode transistor includes changing an on-state of at least one of a plurality of sub-transistors of the match transistor. The method further includes changing a transconductance of the match transistor as a function of the change of the on-state. The method further includes changing an equivalent resistance, as measured between a source and a drain of the cascode transistor, as a function of the change of the transconductance of the match transistor.

摘要翻译： 用于改变具有匹配晶体管和耦合共源共栅晶体管的放大器电路的有效电容的方法包括改变匹配晶体管的多个子晶体管中的至少一个的导通状态。 该方法还包括根据导通状态的变化来改变匹配晶体管的跨导。 该方法还包括改变在共源共栅晶体管的源极和漏极之间测量的等效电阻，作为匹配晶体管的跨导的变化的函数。

公开(公告)号：US07680456B2

公开(公告)日：2010-03-16

申请号：US11059147

申请日：2005-02-16

申请人： Khurram Muhammad ,  Imtinan Elahi

发明人： Khurram Muhammad ,  Imtinan Elahi

IPC分类号： H04B15/00 ,  H04B1/00

CPC分类号： H04B1/109

摘要： Methods, apparatus, and articles of manufacture are disclosed for removing an undesired component from a low intermediate frequency signal having an intermediate center frequency and an undesired component at a first frequency. One example method may include determining an amplitude of the undesired component; frequency shifting the low intermediate frequency signal from the intermediate center frequency to produce a zero intermediate frequency signal; filtering the zero intermediate frequency signal; generating a tone based on the amplitude of the undesired component; and subtracting the tone from the filtered zero intermediate frequency signal to remove the undesired component.

摘要翻译： 公开了用于从具有第一频率的中间中心频率和不期望分量的低中频信号中去除不期望分量的方法，装置和制品。 一个示例性方法可以包括确定不期望的分量的幅度; 从中间中心频率移位低频中频信号，产生零中频信号; 滤除零中频信号; 基于不期望的分量的振幅产生音调; 并从滤波的零中频信号中减去音调以去除不期望的分量。

公开(公告)号：US20090186582A1

公开(公告)日：2009-07-23

申请号：US12017372

申请日：2008-01-22

申请人： Khurram Muhammad ,  Imtinan Elahi

发明人： Khurram Muhammad ,  Imtinan Elahi

IPC分类号： H04B1/00 ,  H04B15/00

CPC分类号： H04B1/525

摘要： A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.

摘要翻译： 全双工收发器具有包括辅助接收器和辅助发射器的消除电路。 更具体地，包括传输信号泄漏的模拟接收信号被提供给低噪声放大器（LNA），低噪声放大器然后将其输出提供给主接收机和辅助接收机。 辅助接收机包括可操作以将接收到的信号从模拟域转换为数字域的部分。 辅助接收机还包括消除处理器，其确定传输信号泄漏并基于所确定的泄漏产生信号。 由辅助接收器产生的该信号被提供给辅助发射机，其将数字信号转换回模拟域并产生消除信号。 模拟消除信号被反馈并加到LNA的输入端的接收信号中。 作为包括辅助接收机和辅助发射机的反馈系统的结果，可以从接收到的信号中消除许多类型的传输信号泄漏。

公开(公告)号：US20090185510A1

公开(公告)日：2009-07-23

申请号：US12017514

申请日：2008-01-22

申请人： Imtinan Elahi ,  Khurram Muhammad

发明人： Imtinan Elahi ,  Khurram Muhammad

IPC分类号： H04B7/005 ,  H04B1/44

CPC分类号： H04B17/21 ,  H04B17/10

摘要： The present invention pertains to a method of calibrating reception properties of a radio frequency (RF) processor. The application describes two embodiments of the invention representing calibration of the properties using an auxiliary transmitter to generate a calibration signal internal to the RF processor.

摘要翻译： 本发明涉及校准射频（RF）处理器的接收特性的方法。 本申请描述了本发明的两个实施例，其表示使用辅助发射机来校准属性，以产生RF处理器内部的校准信号。

公开(公告)号：US07466777B2

公开(公告)日：2008-12-16

申请号：US10924159

申请日：2004-08-23

申请人： Khurram Muhammad ,  Robert B. Staszewski ,  Gennady Feygin

发明人： Khurram Muhammad ,  Robert B. Staszewski ,  Gennady Feygin

IPC分类号： H03D1/04

CPC分类号： H03D7/125 ,  H04B1/1036

摘要： When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired frequency band. A current-mode sampling mixer 800 with capacitor banks 811 and 812 that are controlled by a digital control unit 820 with a capability to integrate and decimate an RF current at different decimating ratios is able to measure the frequency spectrum with different decimating ratios. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. The interferers can then be eliminated or avoided.

摘要翻译： 当采样流被抽取时，来自期望频带外部的频率分量被混叠成所需频带，导致信息的干扰和丢失。 不同的抽取率导致不同的频率混叠成所需的频带。 具有电容器组811和812的电流模式采样混频器800能够以不同的抽取率对能够集成和抽取RF电流的数字控制单元820进行控制，能够以不同的抽取率来测量频谱。 然后分析测量的频谱以检测混叠到期望频带中的干扰源的存在。 然后可以消除或避免干扰源。

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。