发明名称 |
System and method for interrogating a capacitive sensor |
摘要 |
An exemplary embodiment of the invention is a sensing circuit for use with a proximity sensor having a first electrode and a second electrode and a capacitance between the first electrode and the second electrode. The sensing circuit includes a signal generator for generating an alternating signal. The signal generator is for connection to the first electrode of the sensor. A synchronous detector has a first input for connection to the second electrode of the sensor. A phase shifter is coupled to the signal generator and generates a phase shifted signal in response to the alternating signal. The phase shifted signal is provided to a second input of the synchronous detector. The synchronous detector detects a change in the capacitance between the first electrode and the second electrode in response to a signal from the second electrode and the phase shifted signal.
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申请公布号 |
US6469524(B1) |
申请公布日期 |
2002.10.22 |
申请号 |
US20000649465 |
申请日期 |
2000.08.25 |
申请人 |
DELPHI TECHNOLOGIES, INC. |
发明人 |
OBERDIER LARRY MAX |
分类号 |
G01D5/24;(IPC1-7):G01R27/26 |
主分类号 |
G01D5/24 |
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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