Apparatus for lock detection suitable for fractional-N frequency synthesizer and method thereof
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United States of America Patent
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Aug 2, 2016
Grant Date -
Jul 21, 2016
app pub date -
May 18, 2015
filing date -
Jan 21, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed are an apparatus for lock detection suitable for a fractional-N frequency synthesizer and a method thereof. The lock detector for use in the fractional-N frequency synthesizer includes a delay unit delaying an N-divider output frequency clock based on an output value of a fraction ratio modulator, a lock detection unit outputting a lock detection signal by comparing a reference frequency clock with the N-divider output frequency clock delayed by the delay unit, a counter counting the number of lock detection signals received from the lock detection unit, and a controller issuing a command to output a lock identification signal based on the number of lock detection signals counted by the counter.
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