Capacitance measuring circuit capacitance measurin

专利名称：Capacitance measuring circuit capacitance

measuring instrument and microphonedevice

发明人：Masami Yakabe,Naoki Ikeuchi申请号：US10488763申请日：20020906

公开号：US20050017737A1公开日：20050127

专利附图：

摘要：An electrostatic capacitance detection circuit comprises an AC voltage

generator , an operational amplifier of which non-inverting input terminal is connected to

specific potential (a ground in this example), an impedance converter , a resistance (R)connected between the AC voltage generator and an inverting input terminal of theoperational amplifier , a resistance (R) connected between the inverting input terminal ofthe operational amplifier and an output terminal of the impedance converter , and animpedance element (a capacitor) connected between an output terminal of the

operational amplifier and an input terminal of the impedance converter , and a capacitorto be detected is connected between the input terminal of the impedance converter andspecific potential. The electrostatic capacitance detection circuit and the capacitor arelocated adjacently.

申请人：Masami Yakabe,Naoki Ikeuchi

地址：Tokyo JP,Tokyo JP

国籍：JP,JP

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