Phase-locked loop circuit and method
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United States of America Patent
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-
Oct 26, 1993
Grant Date -
N/A
app pub date -
Nov 13, 1990
filing date -
Nov 13, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase-locked loop circuit and method for producing an output signal which is phase locked with respect to an input signal are disclosed. The circuit includes a phase detector responsive to the phase relationship between the input signal and the output signal. A controlled signal generator, which includes a voltage controlled oscillator, generates the output signal and includes coarse adjust circuitry and fine adjust circuitry. The coarse adjust circuitry causes the frequency of the output signal to fall within one of a selected group of frequency bands in response to the frequency of the input signal. Once the coarse adjustment is made, the fine adjust circuitry continuously changes the frequency and phase of the output signal in response to the phase detector so that the output signal will be phase locked to the input signal.
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