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    • 2. 发明授权
    • Signal sampling network with reduced offset error
    • 具有减小偏移误差的信号采样网络
    • US4502079A
    • 1985-02-26
    • US437827
    • 1982-10-29
    • Paul Filliman
    • Paul Filliman
    • H04N5/57H03K17/00H04N5/16H04N9/73H04N5/68
    • H03K17/00H04N9/73
    • A signal clamping and sampling system wherein signals to be sampled are applied to a voltage amplifier The output of the voltage amplifier is coupled in common to the inputs of first and second matched operational transconductance amplifiers (OTA's). s). During an initial clamping reference interval, the first OTA conducts to form a feedback clamping network for establishing input and output reference bias conditions for the voltage amplifier. The second OTA conducts during a subsequent sampling interval for processing signals to be sampled. The output reference bias of the voltage amplifier determines substantially identical input bias conditions for both the first and second OTA's, thereby significantly reducing the likelihood of signal processing offset errors being produced as between the clamping and sampling intervals when the first and second OTA's are respectively conductive.
    • 信号钳位和采样系统,其中要采样的信号被施加到电压放大器。电压放大器的输出共同耦合到第一和第二匹配的运算跨导放大器(OTA)的输入端。 s)。 在初始钳位参考间隔期间,第一OTA导通以形成用于为电压放大器建立输入和输出参考偏置条件的反馈钳位网络。 第二个OTA在随后的采样间隔内进行处理,以对要采样的信号进行处理。 电压放大器的输出参考偏置确定了第一和第二OTA的输入偏置条件基本一致,从而显着地降低当第一和第二OTA分别导通时在钳位和采样间隔之间产生信号处理偏移误差的可能性 。
    • 4. 发明授权
    • Switching network with suppressed switching transients
    • 切换网络,抑制切换瞬变
    • US4513322A
    • 1985-04-23
    • US437828
    • 1982-10-29
    • Paul Filliman
    • Paul Filliman
    • H04N7/12H03K17/00H03K17/16H03K17/60H04N5/16H04N5/57H04N7/26H04N9/535
    • H03K17/00H03K17/16
    • A switching network for selectively supplying current to a clamping capacitor comprises a pair of output transistors with outputs coupled to the clamp capacitor, a pair of control transistors respectively coupled to the output transistors, and a pair of equal value bias resistors included in output circuits of the control transistors for determining the bias of the output transistors. When the control transistors conduct, the control transistors conduct equal output currents, equal currents flow in the bias resistors, and bias voltages developed across the bias resistors exhibit equal rates of change with a sense for rendering the output transistors non-conductive simultaneously.
    • 用于选择性地向钳位电容器提供电流的开关网络包括一对输出晶体管,其输出耦合到钳位电容器,分别耦合到输出晶体管的一对控制晶体管和包括在输出晶体管的输出电路中的一对等值偏置电阻器 用于确定输出晶体管的偏置的控制晶体管。 当控制晶体管导通时,控制晶体管导通相等的输出电流,在偏置电阻中流过相等的电流,跨偏置电阻产生的偏置电压表现出相同的变化率,同时使输出晶体管不导通。