Use of a raw oscillator and frequency locked loop to quicken lock time of frequency locked loop
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United States of America Patent
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Nov 17, 2020
Grant Date -
May 14, 2020
app pub date -
Jan 13, 2020
filing date -
Mar 19, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A method of quickly locking a locked loop includes generating an intermediate reference signal having an intermediate reference frequency between a desired output frequency and a reference frequency of a reference signal, and setting an output frequency of a controllable oscillator to the desired output frequency using a first locked loop having a first loop divider value. The first loop divider value is set such that the intermediate reference frequency multiplied by the first loop divider value is equal to the desired output frequency. The controllable oscillator is then coupled to a second locked loop when the first locked loop locks, with the second locked loop is being activated. The first locked loop is then deactivated.
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