Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1992-10-01
1993-12-07
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
328155, 331 25, 331DIG2, H03L 7095
Patent
active
052686523
ABSTRACT:
A circuit for detecting locking of a digital phase locked loop for locking the phase of a digital outgoing signal as provided by the loop to the phase of a digital incoming signal received by the loop, wherein the phase locked loop includes a detector for detecting the phase difference between the incoming signal and the outgoing signal, and the output signal from the phase difference detector has transitions of a first type in coincidence with transitions of a given type in the outgoing signal, and transitions of a second type in coincidence with transitions of a given type in the incoming signal, the circuit including locking detection means for detecting locking, the locking detection means themselves including means for sampling the output signal from the phase detector by those transitions in the outgoing signal that are of type opposite to the given type, means for storing groups of consecutive samples, comprising not less than three consecutive samples, and means for detecting the instant at which, for the first time, at least two of the samples are not at the same logic level.
REFERENCES:
patent: 4806878 (1989-02-01), Cowley
Alcatel Cit
Grimm Siegfried H.
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