Frequency calibration circuit for automatically calibrating frequency and method thereof
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United States of America Patent
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Jan 21, 2014
Grant Date -
Jan 5, 2012
app pub date -
Oct 20, 2010
filing date -
Jun 30, 2010
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Abstract
Generate a series of digital data according to a pair of differential signals received from a low speed universal serial bus. Calibrate coarsely a frequency of an oscillator according to a width of an end-of-packet of the series of digital data. And calibrate finely the frequency of the oscillator according to a width of a SYNC pattern of the series of digital data.
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