Phase comparators
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United States of America Patent
Stats
-
Jul 25, 1989
Grant Date -
N/A
app pub date -
Mar 18, 1988
filing date -
Mar 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A phase comparator accepts two streams of digital pulses, one being a reference signal and the other a test signal, and generates an output signal indicative of the phase difference. The phase comparator can be implemented as a four-state device or higher, and thus exhibits a wide phase capture range, i.e. multiples of 360.degree., and can provide a stable, predictable and linear output signal when the two input signals are in lock. It is therefore very suitable for use in a phase locked loop in which temporary wide variations in phase can occur.
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