Phase-locked loop circuit
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United States of America Patent
Stats
-
Apr 2, 1991
Grant Date -
N/A
app pub date -
Apr 7, 1989
filing date -
Apr 25, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase-locked loop circuit adapted to produce a stable output signal having the same frequency and phase as those of an input signal. Phase comparator means measures the time difference between the rising edge of the input signal and the falling edge of the feedback signal, and calculator means executes a phase control calculation twice per cycle on the basis of the measured time difference. Then a variable-frequency oscillator circuit produces, in accordance with the result of such calculation, an output signal whose frequency and phase are locked to those of the input signal.
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