发明申请
- 专利标题： Apparatus and Method for Reducing Parasitic Capacitive Coupling and Noise in Fingerprint Sensing Circuits
- 专利标题（中）： 指纹传感电路中降低寄生电容耦合和噪声的装置和方法
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申请号： US12098370申请日： 2008-04-04
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公开(公告)号： US20090252386A1公开(公告)日： 2009-10-08
- 发明人: Gregory Lewis Dean , Richard Alexander Erhart , Jaswinder Jandu , Erik Jonathon Thompson
- 申请人： Gregory Lewis Dean , Richard Alexander Erhart , Jaswinder Jandu , Erik Jonathon Thompson
- 申请人地址： US CA San Jose
- 专利权人： Validity Sensors, Inc.
- 当前专利权人： Validity Sensors, Inc.
- 当前专利权人地址： US CA San Jose
- 主分类号： G06K9/00
- IPC分类号： G06K9/00
摘要：
A fingerprint sensing circuit for reducing noise and parasitic capacitive coupling is disclosed in one embodiment of the invention as including a plurality of transmitting elements to sequentially emit a probing signal. A digital ground is provided to ground digital components in the fingerprint sensing circuit. A quiet ground, separate from and quieter than the digital ground, is provided to ground transmitting elements that are not transmitting the probing signal. Similarly, control logic is provided to connect, to the quiet ground, transmitting elements that are not transmitting the probing signal, while disconnecting, from the quiet ground, transmitting elements that are emitting the probing signal. The quiet ground helps to reduce the adverse effects of parasitic capacitive coupling and noise on the inactive transmitting elements.
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