PLL adjustment to find and maintain resonant frequency of piezo electric finger print sensor
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United States of America Patent
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Aug 20, 2013
Grant Date -
Nov 12, 2009
app pub date -
May 6, 2008
filing date -
May 6, 2008
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Abstract
Provided is a method for determining a resonant frequency of a biometric sensor. The method includes obtaining first pixel data from a first scan by scanning the biometric sensor with a first frequency. Second pixel data is obtained from a second scan by scanning the biometric sensor with a second frequency that is different from the first frequency. A respective first and second reference value is calculated from the first and the second pixel data. A highest reference value is determined from the first and the second reference values. The first or the second frequency is selected as the resonant frequency based on the highest reference value.
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