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Method and system for processing fingerprint sensing signals and fingerprint identification terminal

  • US 9,940,501 B2
  • Filed: 10/09/2014
  • Issued: 04/10/2018
  • Est. Priority Date: 08/15/2014
  • Status: Active Grant
First Claim
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1. A method for processing fingerprint sensing signals by a circuit, wherein the circuit comprises a frequency mixer and a capacitive feedback amplifier, the method comprising:

  • mixing, by the frequency mixer, a collected high frequency fingerprint sensing signal with a first high frequency signal to obtain a low frequency signal; and

    amplifying, by the capacitive feedback amplifier, the low frequency signal, wherein the capacitive feedback amplifier includes an inverting input end connected to an output end of the frequency mixer, a non-inverting input end connected to a bias voltage, and an output end, wherein a feedback capacitor is connected between the inverting input end and the output end of the capacitive feedback amplifier.

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