Invention Grant
- Patent Title: Fingerprint sensing device with common mode suppression
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Application No.: US15168671Application Date: 2016-05-31
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Publication No.: US09684812B2Publication Date: 2017-06-20
- Inventor: Frank Robert Riedijk , Klaas-Jan de Lange
- Applicant: Fingerprint Cards AB
- Applicant Address: SE Göteborg
- Assignee: FINGERPRINT CARDS AB
- Current Assignee: FINGERPRINT CARDS AB
- Current Assignee Address: SE Göteborg
- Agency: Remarck Law Group PLC
- Priority: SE1551242 20150929
- Main IPC: G06K9/00
- IPC: G06K9/00

Abstract:
The present invention relates to a fingerprint sensing device for sensing a fingerprint pattern of a finger, the fingerprint sensing device comprising at least a first sensing structure and a second sensing structure; and at least a first charge amplifier and a second charge amplifier. Each charge amplifier comprises: a first input; a second input; an output; and at least one amplifier stage between the first and second inputs, and the output. The output is capacitively coupled to the first input. The first input of the first charge amplifier is connected to the first sensing structure; the first input of the second charge amplifier is connected to the second sensing structure; and the output of the first charge amplifier is capacitively coupled to the first input of the second charge amplifier to suppress the common mode component.
Public/Granted literature
- US20170091509A1 FINGERPRINT SENSING DEVICE WITH COMMON MODE SUPPRESSION Public/Granted day:2017-03-30
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