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110 条记录 (耗时 0.024 秒)

    System and method for amplifier gain measurement and compensation
    5.
    发明授权
    System and method for amplifier gain measurement and compensation 有权
    放大器增益测量和补偿的系统和方法

    公开(公告)号：US07639082B2

    公开(公告)日：2009-12-29

    申请号：US11847961

    申请日：2007-08-30

    申请人： Khurram Muhammad ,  Dirk Leipold ,  Chandana Fernando

    发明人： Khurram Muhammad ,  Dirk Leipold ,  Chandana Fernando

    IPC分类号： H03F3/04

    CPC分类号： H03G3/30 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/336 ,  H03F2200/468

    摘要： A system and method for amplifier gain measurement and compensation. A method for compensating a signal gain of an amplifier circuit includes determining a desired gain for the amplifier circuit, determining an operating temperature of the amplifier circuit, adjusting a set of signal gains based on the operating temperature to produce a set of adjusted signal gains, determining a desired gain setting based on the desired gain and the set of signal gains, and providing the desired gain setting to the amplifier circuit.

    摘要翻译： 一种用于放大器增益测量和补偿的系统和方法。 用于补偿放大器电路的信号增益的方法包括确定放大器电路的期望增益，确定放大器电路的工作温度，基于工作温度调整一组信号增益以产生一组经调整的信号增益， 基于期望的增益和所述一组信号增益确定期望的增益设置，以及向放大器电路提供期望的增益设置。

    Direct radio frequency (RF) sampling with recursive filtering method
    6.
    发明授权
    Direct radio frequency (RF) sampling with recursive filtering method 有权
    直接射频（RF）采样采用递归滤波法

    公开(公告)号：US07519135B2

    公开(公告)日：2009-04-14

    申请号：US10190867

    申请日：2002-07-08

    申请人： Robert B. Staszewski ,  Khurram Muhammad ,  Kenneth J. Maggio ,  Dirk Leipold

    发明人： Robert B. Staszewski ,  Khurram Muhammad ,  Kenneth J. Maggio ,  Dirk Leipold

    IPC分类号： H03K5/01

    CPC分类号： H03D7/125 ,  H04B1/1036

    摘要： A radio receiver 2000 with a sampling mixer 1100 for creating a discrete-time sample stream by directly sampling an RF current with history and rotating capacitors 1111 and 1112, wherein the accumulated charge on the rotating capacitors is read-out to produce a sample. The mixer provides immunity to noise glitches by predicting the occurrence of the glitch (or detecting a significant difference between observed and predicted samples) and creating corrected samples for the corrupted samples. These corrected samples can be created with special circuitry 1933 (digital) or in the mixer 1100 (analog).

    摘要翻译： 具有采样混合器1100的无线电接收机2000，用于通过用历史和旋转电容器1111和1112直接采样RF电流来产生离散时间采样流，其中读出旋转电容器上的累积电荷以产生样本。 混合器通过预测毛刺的发生（或检测观察到的和预测的样品之间的显着差异）并为损坏的样品产生校正的样品来提供对噪声毛刺的免疫。 这些校正样本可以用专用电路1933（数字）或混合器1100（模拟）来创建。

    Methods and apparatus to provide an auxiliary receive path to support transmitter functions
    7.
    发明申请
    Methods and apparatus to provide an auxiliary receive path to support transmitter functions 有权
    提供辅助接收路径以支持发射机功能的方法和装置

    公开(公告)号：US20080113628A1

    公开(公告)日：2008-05-15

    申请号：US11595101

    申请日：2006-11-09

    申请人： Khurram Muhammad ,  Dirk Leipold

    发明人： Khurram Muhammad ,  Dirk Leipold

    IPC分类号： H04B1/40

    CPC分类号： H04B1/52

    摘要： Methods and apparatus to provide an auxiliary receive path to support transmitter functions are disclosed. An example transceiver includes an antenna and a duplexer coupled to the antenna. A transmitter is coupled to the duplexer to output a transmit signal at a transmit frequency. A receiver is coupled to the duplexer to receive a received signal at a receiver frequency. A signal processor is coupled to the transmitter and receiver. An auxiliary receiver is communicatively coupled to the signal processor to receive the transmit signal output from the transmitter and send an auxiliary receiver signal to the signal processor. The signal processor adjusts the transmit signal based on the auxiliary receiver signal.

    摘要翻译： 公开了提供辅助接收路径以支持发射机功能的方法和装置。 示例收发器包括耦合到天线的天线和双工器。 发射机耦合到双工器以以发射频率输出发射信号。 接收机耦合到双工器以在接收机频率处接收接收的信号。 信号处理器耦合到发射机和接收机。 辅助接收器通信地耦合到信号处理器以接收从发射机输出的发射信号，并向辅助接收机信号发送信号处理器。 信号处理器根据辅助接收机信号调整发射信号。

    Offset balancer, method of balancing an offset and a wireless receiver employing the balancer and the method
    8.
    发明申请
    Offset balancer, method of balancing an offset and a wireless receiver employing the balancer and the method 有权
    偏移平衡器，平衡偏移的方法和采用平衡器的无线接收器及其方法

    公开(公告)号：US20070105522A1

    公开(公告)日：2007-05-10

    申请号：US11270122

    申请日：2005-11-09

    申请人： Khurram Muhammad ,  Dirk Leipold

    发明人： Khurram Muhammad ,  Dirk Leipold

    IPC分类号： H04B1/26

    CPC分类号： H03D3/008

    摘要： The present invention provides an offset balancer for use with a differential mixer employing a wireless reception and an offset quantifier configured to indicate an existing DC offset of the mixer corresponding to an existing second-order intercept point applicable to the wireless reception. In one embodiment, the offset balancer includes an offset adjuster coupled to the offset quantifier and configured to provide an offset adjustment to the existing DC offset based on increasing the existing second-order intercept point.

    摘要翻译： 本发明提供一种与使用无线接收的差分混频器一起使用的偏移平衡器和配置为指示对应于可应用于无线接收的现有二阶截取点的混频器的现有DC偏移的偏移量化器。 在一个实施例中，偏移平衡器包括偏移调整器，该偏移调整器耦合到偏移量化器并且被配置为基于增加现有的二阶截取点来提供对现有DC偏移的偏移调整。

    Removing close-in interferers through a feedback loop
    9.
    发明申请
    Removing close-in interferers through a feedback loop 有权
    通过反馈回路消除紧密的干扰源

    公开(公告)号：US20060135107A1

    公开(公告)日：2006-06-22

    申请号：US11339386

    申请日：2006-01-25

    申请人： Robert Staszewski ,  Khurram Muhammad ,  Dirk Leipold

    发明人： Robert Staszewski ,  Khurram Muhammad ,  Dirk Leipold

    IPC分类号： H04B1/10

    CPC分类号： H04B1/28 ,  H04B1/1036

    摘要： System and method for elimination of close-in interferers through feedback. A preferred embodiment comprises an interferer predictor (for example, interferer predictor 840) coupled to a digital output of a direct RF radio receiver (for example, radio receiver 800). The interferer predictor predicts the presence of interferers and feeds the information back to a sampling unit (for example, sampling unit 805) through a feedback circuit (for example, feedback unit 845) through the use of charge sharing. The interferers are then eliminated in the sampling unit. Additionally, the number and placement of zeroes in a filter in the sampling unit is increased and changed through the implementation of arbitrary-coefficient finite impulse response filters.

    摘要翻译： 通过反馈消除接近干扰的系统和方法。 优选实施例包括耦合到直接RF无线电接收机（例如，无线电接收机800）的数字输出的干扰源预测器（例如，干扰源预测器840）。 干扰源预测器预测干扰源的存在，并且通过使用电荷共享通过反馈电路（例如，反馈单元845）将信息反馈给采样单元（例如，采样单元805）。 然后在采样单元中消除干扰源。 另外，通过执行任意系数有限脉冲响应滤波器来增加和改变采样单元滤波器中的零数和位置。

    Image reject filtering in a direct sampling mixer
    10.
    发明申请
    Image reject filtering in a direct sampling mixer 审中-公开
    直接采样混频器中的图像抑制滤波

    公开(公告)号：US20050233725A1

    公开(公告)日：2005-10-20

    申请号：US10828386

    申请日：2004-04-20

    申请人： Khurram Muhammad ,  Robert Staszewski ,  Dirk Leipold

    发明人： Khurram Muhammad ,  Robert Staszewski ,  Dirk Leipold

    IPC分类号： H03D7/18 ,  H03H19/00 ,  H04B1/16 ,  H04B1/28

    CPC分类号： H03D7/18 ,  H03H19/004 ,  H03H2007/0192

    摘要： Disclosed are methods, circuits and systems for image reject filtering in a multi-tap direct sampling mixer (MTDSM) of an IF or RF system. Disclosed is the use of rotating capacitors among the in-phase and quadrature branches of a signal processing system. The exchange of information among the branches of the I and Q channels is used in the implementation of a complex filter. Embodiments using cascaded multiple stages of the complex filter to provide higher order complex filters are also disclosed.

    摘要翻译： 公开了用于IF或RF系统的多抽头直接采样混频器（MTDSM）中的图像抑制滤波的方法，电路和系统。 公开了在信号处理系统的同相和正交分支中使用旋转电容器。 在I和Q通道的分支之间的信息交换被用于实现复杂的过滤器。 还公开了使用复合滤波器的级联多级以提供更高阶复数滤波器的实施例。