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    • 9. 发明申请
    • One terminal capacitor interface circuit
    • 一个端子电容接口电路
    • US20060213270A1
    • 2006-09-28
    • US11370764
    • 2006-03-08
    • John O'DowdDamien McCartneyGabriel Banarie
    • John O'DowdDamien McCartneyGabriel Banarie
    • G01P15/125
    • G01D5/24G01P15/125H03M3/34H03M3/458
    • A one terminal capacitor interface circuit for sensing the capacitance of a capacitor includes a differential integrating amplifier having an input common mode voltage and two summing nodes whose voltage is substantially equal to the input common mode voltage, a switching circuit for charging the capacitor to a first voltage level in a first phase, connecting, in a second phase, the capacitor to one of the summing nodes of the differential amplifier to provide a first output change substantially representative of the difference between the first voltage level and the input common mode voltage, and also representative of the capacitor; charging the capacitor to a second voltage level in a third phase, and connecting, in a fourth phase, the capacitor to the other summing node of the differential amplifier to provide a second output change substantially representative of the difference between the second voltage level and the input common mode voltage, and also representative of the capacitor; the combined first and second output changes representing the capacitance of the capacitor substantially independent of the input common mode voltage.
    • 用于感测电容器的电容的单端电容器接口电路包括具有输入共模电压的差分积分放大器和电压基本上等于输入共模电压的两个求和节点,用于将电容器充电到第一 电压电平在第一阶段中,在第二阶段将电容器连接到差分放大器的求和节点之一,以提供基本上代表第一电压电平和输入共模电压之间的差的第一输出变化,以及 也代表电容器; 在第三相中将电容器充电到第二电压电平,并且在第四相中将电容器连接到差分放大器的另一个求和节点,以提供基本上代表第二电压电平与第二电压电平之间的差的第二输出变化 输入共模电压,也代表电容; 组合的第一和第二输出变化表示电容器的电容基本上独立于输入共模电压。