Apparatus and method for reducing noise in fingerprint sensing circuits
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United States of America Patent
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Feb 14, 2012
Grant Date -
Oct 8, 2009
app pub date -
Apr 4, 2008
filing date -
Apr 4, 2008
priority date (Note) -
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Abstract
An apparatus for reducing noise in fingerprint sensing circuits is disclosed in one embodiment of the invention as including a fingerprint sensing area onto which a user can apply a fingerprint. An analog front end is coupled to the fingerprint sensing area and is configured to generate an analog response signal. An analog-to-digital converter (ADC) samples the analog response signal and converts the sample to a digital value, which may be received by a digital device such as a processor or CPU. To reduce the amount of the noise that is present in the analog response signal and therefore reflected in the digital value, the digital device may be shut down while the ADC is sampling the analog response signal.
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