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30 条记录 (耗时 0.046 秒)

    Method and system for DC offset cancellation from a modulated signal
    7.
    发明申请
    Method and system for DC offset cancellation from a modulated signal 有权
    用于调制信号的直流偏移消除的方法和系统

    公开(公告)号：US20050260965A1

    公开(公告)日：2005-11-24

    申请号：US11115199

    申请日：2005-04-27

    申请人： Sumant Ranganathan ,  Tom Kwan ,  Hung-Sung Li

    发明人： Sumant Ranganathan ,  Tom Kwan ,  Hung-Sung Li

    IPC分类号： H04B1/10 ,  H04B1/30

    CPC分类号： H04B1/30

    摘要： Provided are a method and system for removing an offset direct current (DC) component from an input waveform. The method includes multiplying the input waveform with a demodulation waveform to produce a first differential current signal. An absolute value representation of the demodulation waveform is multiplied with a reference DC offset value to produce a second differential current signal. The first and second differential current signals are then differenced.

    摘要翻译： 提供了用于从输入波形去除偏移直流（DC）分量的方法和系统。 该方法包括将输入波形与解调波形相乘以产生第一差分电流信号。 将解调波形的绝对值表示与参考DC偏移值相乘以产生第二差分电流信号。 然后，第一和第二差分电流信号被差分。

    Line driver for an adaptive hybrid circuit
    9.
    发明授权
    Line driver for an adaptive hybrid circuit 有权
    自适应混合电路的线路驱动器

    公开(公告)号：US08208462B2

    公开(公告)日：2012-06-26

    申请号：US12497337

    申请日：2009-07-02

    申请人： Tom Kwan ,  Sumant Ranganathan

    发明人： Tom Kwan ,  Sumant Ranganathan

    IPC分类号： H04B3/23 ,  H04M9/08

    CPC分类号： H04L5/1423 ,  H04L25/0278

    摘要： A second output transmission signal (“TX2”) added to a line driver is a scaled version of the main output transmission signal (“TX1”). TX2 is scaled from TX1 by a variable scale factor K. An adaptive hybrid circuit subtracts TX1 and TX2 from a line signal carrying both a line transmission signal and a line received signal (“RX”). A programmable impedance Ztune is coupled between the TX2 output of the line driver and the RX output of the adaptive hybrid circuit. A transmission echo in the output RX signal is measured. K and Ztune are then adaptively tuned to minimize the transmission echo. The hybrid in this case becomes a 4-port network, one port specifically added to adaptively cancel the transmission echo in the RX output of the adaptive hybrid circuit. Alternatively, the hybrid may be a 3-port hybrid including variable impedances to cancel the line transmission signal.

    摘要翻译： 添加到线路驱动器的第二输出发送信号（“TX2”）是主输出发送信号（“TX1”）的缩放版本。 TX2通过可变比例因子K从TX1缩放。自适应混合电路从携带线路传输信号和线路接收信号（“RX”）的线路信号中减去TX1和TX2。 可编程阻抗Ztune耦合在线路驱动器的TX2输出和自适应混合电路的RX输出之间。 测量输出RX信号中的传输回波。 然后自适应调整K和Ztune以最小化传输回波。 在这种情况下，混合器成为一个4端口网络，一个专门添加的端口自适应地消除了自适应混合电路的RX输出中的传输回波。 或者，混合动力可以是包括可变阻抗以消除线路传输信号的3端口混合器。

    Register with default control and built-in level shifter
    10.
    发明申请
    Register with default control and built-in level shifter 有权
    注册默认控制和内置电平转换器

    公开(公告)号：US20070114984A1

    公开(公告)日：2007-05-24

    申请号：US11284199

    申请日：2005-11-21

    申请人： Ning Li ,  Tom Kwan

    发明人： Ning Li ,  Tom Kwan

    IPC分类号： G05F1/00

    CPC分类号： H02M3/157 ,  Y10S323/901

    摘要： Embodiment of the present invention may provide a switching regulator which may be located within an IC. The switching regulator couples to an external power supply, a plurality of configurable control registers, a plurality of default registers, and a multiplexer. The multiplexer is operable to select an input control signal from either the plurality of configurable control registers or the plurality of default control registers as the output control signal to the switching regulator. This default control signal, although not optimal, allows the switching regulator to be configured in a default condition during start up or power down operations and ensures that the switching regulator may provide a stable, although not necessarily optimal, power output to the various components within the IC.

    摘要翻译： 本发明的实施例可以提供可以位于IC内的开关调节器。 开关稳压器耦合到外部电源，多个可配置控制寄存器，多个默认寄存器和多路复用器。 多路复用器可操作以从多个可配置控制寄存器或多个默认控制寄存器中选择输入控制信号作为到开关调节器的输出控制信号。 这种默认控制信号尽管不是最佳的，但允许开关稳压器在启动或掉电操作期间被配置为默认状态，并且确保开关稳压器可以提供稳定的但不一定最优的功率输出给各种组件 IC。