发明名称 |
Capacitance Measurement Circuit and Method Therefor |
摘要 |
A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit.
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申请公布号 |
US2011074446(A1) |
申请公布日期 |
2011.03.31 |
申请号 |
US20100884886 |
申请日期 |
2010.09.17 |
申请人 |
RAYDIUM SEMICONDUCTOR CORPORATION |
发明人 |
CHOU SHIH-TZUNG;RAO YONG-NIEN;KUANG YU |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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