Fast phase-lock frequency synthesizer with variable sampling efficiency
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United States of America Patent
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Jan 6, 1987
Grant Date -
N/A
app pub date -
Jul 17, 1985
filing date -
Jul 17, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phase-locked frequency synthesizer (10) having a voltage controlled oscillator (40), a divider circuit (60), and a sample-and-hold phase detector (30, 80, 90, 100, 110) which includes sample-and-hold circuitry (FIG. 6) having variable efficiency. Specifically, the sample-and-hold circuitry provides a sampling pulse of variable width which is controlled to be wider during acquisition and narrower during steady-state operation.
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