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    • 2. 发明授权
    • Voltage comparator provided with capacitively cascade-connected
inverting amplifiers
    • 电压比较器提供电容级联连接的反相放大器
    • US4211942A
    • 1980-07-08
    • US925801
    • 1978-07-18
    • Kazuhide AokiKenji Kawagai
    • Kazuhide AokiKenji Kawagai
    • H03K5/08G01R19/165H03K5/24H03M1/00H03K5/20H03K17/60
    • H03K5/249G01R19/16557H03M1/42
    • A voltage comparator suitable for use in an analog-to-digital converter such as a successive-approximation converter, and provided with capacitively cascade-connected inverter stages to produce an output signal of a logic level 1 or 0 according to the relationship between the magnitudes of two analog input voltage signals to be compared. A first series circuit of an MOS switching transistor and resistive element is connected between the input and output of the respective inverters; a second series circuit of a MOS switching transistor and resistive element is connected between the input of each inverter and circuit ground. The MOS transistors of the first and second series circuits are simultaneously enabled or disabled by a clock pulse; and two input voltage signals to be compared are alternately applied to the first stage coupling capacitor.
    • 适用于诸如逐次逼近转换器的模 - 数转换器中的电压比较器,并且具有电容级联连接的反相器级,以根据幅度之间的关系产生逻辑电平1或0的输出信号 两个模拟输入电压信号进行比较。 MOS开关晶体管和电阻元件的第一串联电路连接在各个逆变器的输入和输出之间; MOS开关晶体管和电阻元件的第二串联电路连接在每个逆变器的输入端和电路接地之间。 第一和第二串联电路的MOS晶体管由时钟脉冲同时使能或禁止; 并且要比较的两个输入电压信号交替地施加到第一级耦合电容器。
    • 4. 发明授权
    • Voltage comparator having capacitively cascade-connected inverting
amplifiers
    • 具有电容级联连接的反相放大器的电压比较器
    • US4197472A
    • 1980-04-08
    • US925802
    • 1978-07-18
    • Kazuhide AokiYasuo Nakada
    • Kazuhide AokiYasuo Nakada
    • H03F3/16G01R19/00H03F3/34H03F3/345H03K5/08H03K5/24H03K5/20H03K17/60
    • G01R19/0038H03K5/249
    • A voltage comparator suitable for use in an analog-to-digital converter such as a successive-approximation converter which is comprised of a plurality of capacitively cascade-connected inverters to generate an output signal of a logic level 1 or 0 according to the relationship between the magnitudes of two analog input voltage signals to be compared. A bias circuit for impressing a bias voltage on the inputs of the inverters comprises first and second MOS transistor resistor elements connected in series across a power source and a third MOS transistor which is connected in parallel to the second MOS transistor, and whose gate is supplied with a control voltage so that the inverters are respectively biased to the optimum operation point for comparison through adjustment of the control voltage. With another embodiment of this invention, the respective inverters are automatically biased to the optimum operation point for comparison by detection of the bias voltage of inverters.
    • 一种适用于诸如逐次逼近转换器的模数转换器的电压比较器,其包括多个电容级联连接的反相器,以根据以下之间的关系产生逻辑电平1或0的输出信号 两个模拟输入电压信号的幅度要比较。 用于对反相器的输入施加偏置电压的偏置电路包括串联连接在电源上的第一和第二MOS晶体管电阻元件和与第二MOS晶体管并联连接并且其栅极被提供的第三MOS晶体管 具有控制电压,使得逆变器被分别偏置到最佳操作点,以通过调节控制电压进行比较。 在本发明的另一实施例中,通过检测逆变器的偏置电压,各自的逆变器被自动偏置到最佳操作点进行比较。