LOCKED LOOP CIRCUIT WITH REFERENCE SIGNAL PROVIDED BY UN-TRIMMED OSCILLATOR
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United States of America
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Mar 5, 2020
app pub date -
Nov 5, 2019
filing date -
Nov 5, 2019
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Abstract
A circuit includes a frequency detector generating a comparison signal as a function of a comparison between a reference signal and a feedback signal. An oscillator generates an output signal as a function of the comparison signal. A frequency divider, in operation, divides the output signal by a division value to produce the feedback signal as having a frequency that is a multiple of a frequency of the reference signal. A frequency counter circuit measures the frequency of the reference signal and generates a count signal based thereupon. A control circuit adjusts the division value used by the frequency divider, in operation, based upon the count signal.
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