PLL circuit
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United States of America Patent
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May 19, 2020
Grant Date -
Sep 26, 2019
app pub date -
Dec 15, 2016
filing date -
Dec 15, 2016
priority date (Note) -
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Abstract
A lock detector (8) detects an unlocked state from an output of a phase frequency comparator (1). A counter (9) counts a reference signal, in a case where an unlocked state is detected by the lock detector (8). A parameter controlling circuit (10) acquires the count value of the counter (9), and controls switching on and off of a switch (12) for a D/A converter (11) that generates a signal to be added to an output of a loop filter (3), and the output voltage of the D/A converter (11) so that the count value of the counter (9) falls within a set value.
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