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    • 85. 发明授权
    • Offset-compensated switched-capacitor filter for TDM multichannel analog
signals
    • 用于TDM多通道模拟信号的偏移补偿开关电容滤波器
    • US4745594A
    • 1988-05-17
    • US10432
    • 1987-02-03
    • Yutaka Takahashi
    • Yutaka Takahashi
    • H03H19/00H04J3/10H04J3/20
    • H04J3/20H03H19/004H04J3/10
    • For adaptive line equalization of a time-division multiplexed analog signal, an offset-compensated filter circuit comprises a timing circuit for generating channel-switching signals respectively synchronized with the time slots of the TDM signal. A switched-capacitor filter comprising an operational amplifier and a switched-capacitor circuit is responsive to the channel-switching signals for sequentially establishing transfer functions specific to the time slots of the TDM signal. A plurality of switched-capacitor DC decoupling circuits are connected to the output of the switched-capacitor filter. These DC decoupling circuits are respectively associated with the channel-switching signals for coupling a respective one of the filtered components to an input terminal of a summing amplifier. Each of the DC decoupling circuits has a first and a second capacitor and switches responsive to the presence of the associated channel-switching signal for charging the first capacitor with a voltage developed at the output terminal of the switched capacitor filter and charging the second capacitor with a voltage developed between the output of the switched capacitor filter and the input terminal of the summing amplifier and discharging the first and second capacitors in response to the absence of the associated channel-switching signal. The operational amplifier offset voltage and clock feedthrough of the switched-capacitor filter are eliminated.
    • 对于时分复用模拟信号的自适应线路均衡,偏移补偿滤波器电路包括用于产生分别与TDM信号的时隙同步的信道切换信号的定时电路。 包括运算放大器和开关电容电路的开关电容滤波器响应于信道切换信号,以顺序地建立专用于TDM信号的时隙的传送功能。 多个开关电容器DC去耦电路连接到开关电容滤波器的输出端。 这些DC去耦电路分别与用于将滤波的分量中的相应一个耦合到加法放大器的输入端的信道切换信号相关联。 每个DC去耦电路具有第一和第二电容器,并且响应于存在相关联的沟道切换信号的开关,用于对开关电容滤波器的输出端产生的电压对第一电容器充电,并向第二电容器充电, 在开关电容滤波器的输出和求和放大器的输入端之间产生电压,并响应于不存在关联的通道切换信号而对第一和第二电容器进行放电。 消除了开关电容滤波器的运算放大器失调电压和时钟馈通。