NASA NTRS · 19730000351
Frequency control circuit for all-digital phase-lock loops
Abstract
Phase-lock loop references all its operations to fixed high-frequency service clock operating at highest speed which digital circuits permit. Wide-range control circuit provides linear control of frequency of reference signal. It requires only two counters in combination with control circuit consisting only of flip-flop and gate.
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Anderson, T. O.. 1973-08-01. Frequency control circuit for all-digital phase-lock loops. https://ntrs.nasa.gov/citations/19730000351
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