发明名称 |
Capacitive field sensor with sigma-delta modulator |
摘要 |
A capacitive sensor includes a switching capacitor circuit, a comparator, and a charge dissipation circuit. The switching capacitor circuit reciprocally couples a sensing capacitor in series with a modulation capacitor during a first switching phase and discharges the sensing capacitor during a second switching phase. The comparator is coupled to compare a voltage potential on the modulation capacitor to a reference and to generate a modulation signal in response. The charge dissipation circuit is coupled to the modulation capacitor to selectively discharge the modulation capacitor in response to the modulation signal.
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申请公布号 |
US8564313(B1) |
申请公布日期 |
2013.10.22 |
申请号 |
US201213612803 |
申请日期 |
2012.09.12 |
申请人 |
RYSHTUN ANDRIY;KREMIN VICTOR;CYPRESS SEMICONDUCTOR CORPORATION |
发明人 |
RYSHTUN ANDRIY;KREMIN VICTOR |
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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