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    • 7. 发明授权
    • Static capacitance-to-voltage converter and converting method
    • 静态电容电压转换器及其转换方法
    • US06331780B1
    • 2001-12-18
    • US09381780
    • 1999-09-23
    • Tatsuo HiroshimaKoichi NakanoMuneo HaradaToshiyuki MatsumotoYoshihiro Hirota
    • Tatsuo HiroshimaKoichi NakanoMuneo HaradaToshiyuki MatsumotoYoshihiro Hirota
    • G01R2726
    • G01R27/2605
    • A static capacitance-to-voltage converter is capable of converting a static capacitance into a voltage without suffering from a stray capacitance formed between a signal and a shielding line or a stray capacitance formed between an exposed portion of the signal line and its surroundings. The static capacitance-to-voltage converter is formed of an operational amplifier placed in an imaginary short-circuit state between an inverting input and a non-inverting input thereof; a signal line having one end connected to the inverting input and the other end capable of being connected to a static capacitance; a shielding line surrounding the signal line and connected to the non-inverting input; an alternating current signal generator for applying the non-inverting input with an alternating current signal; and zero adjusters for adjusting the output of the static capacitance-to-voltage converter to minimum when no static capacitance is connected to the signal line.
    • 静态电容 - 电压转换器能够将静态电容转换成电压,而不会在信号线与屏蔽线之间形成的寄生电容或信号线的暴露部分与其周围环境之间形成的杂散电容。 静态电容 - 电压转换器由在反相输入端和非反相输入端之间以假想短路状态放置的运算放大器形成; 信号线,其一端连接到反相输入,另一端能够连接到静态电容; 围绕信号线并连接到非反相输入的屏蔽线; 交流信号发生器,用于以交流信号施加所述非反相输入; 以及用于在静态电容连接到信号线时将静态电容 - 电压转换器的输出调整到最小的零点调整器。