Invention Application
- Patent Title: HALF-BRIDGE FINGERPRINT SENSING METHOD
- Patent Title (中): 半桥指纹感测方法
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Application No.: PCT/US2016/050186Application Date: 2016-09-02
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Publication No.: WO2017044386A1Publication Date: 2017-03-16
- Inventor: KRAVETS, Igor , OGIRKO, Roman , KLEIN, Hans , HOSHTANAR, Oleksandr
- Applicant: CYPRESS SEMICONDUCTOR CORPORATION
- Applicant Address: 198 Champion Court San Jose, California 95134 US
- Assignee: CYPRESS SEMICONDUCTOR CORPORATION
- Current Assignee: CYPRESS SEMICONDUCTOR CORPORATION
- Current Assignee Address: 198 Champion Court San Jose, California 95134 US
- Priority: US62/216,253 20150909; US62/216,241 20150909; US14/978,442 20151222
- Main IPC: G06K9/00
- IPC: G06K9/00
Abstract:
Fingerprint detection circuits with common mode noise rejection are described. The Fingerprint detection circuit includes a half-bridge circuit coupled to a receive (RX) electrode of an array of fingerprint detection electrodes and to a buried capacitance that is unalterable by the presence of a conductive object on the array. The fingerprint detection circuit may also include a listener electrode configured to enable common mode noise rejection through a differential input stage of a low noise amplifier (LNA).
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