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Apparatus and method for reducing noise in fingerprint sensing circuits

  • US 8,116,540 B2
  • Filed: 04/04/2008
  • Issued: 02/14/2012
  • Est. Priority Date: 04/04/2008
  • Status: Active Grant
First Claim
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1. An apparatus for reducing noise in fingerprint sensing circuits, the apparatus comprising:

  • a fingerprint sensing area onto which a user can apply a fingerprint;

    an analog front end coupled to the fingerprint sensing area to generate an analog response signal;

    an analog-to-digital converter (ADC) to sample the analog response signal and convert the sample to a digital value;

    a digital device to receive the digital value from the ADC, the digital device further configured to shut down while the ADC is sampling the analog response signal;

    wherein the digital device is shut down by turning off a clock signal to the digital device; and

    wherein the digital device is further configured to re-start while the ADC is converting a sample to a digital value.

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