High resolution digital phase locked loop with automatic recover

Details High resolution digital phase locked loop with automatic recover High resolution digital phase locked loop with automatic recover

1993-05-05

1996-09-03

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327158, 327277, H04L 708

Patent

active

055527264

ABSTRACT:
A phase locked loop circuit 11 includes a phase detection circuit 12, a means for phase adjustment, and a recovery circuit 18. The phase detection circuit 12 monitors the phase relationship between two signals and communicates the phase relationship to the phase adjustment means. The phase adjustment means provides appropriate delay to one of the signals to synchronize the two signals. The recover circuit 18 monitors the phase adjustment means for synchronization failures and provides appropriate notice to the phase adjustment means. The phase locked loop circuit 11 provides improved phase jitter resolution through the phase adjustment means. The circuit provides failure identification and correction through the recovery circuit resulting in improved phase locked loop circuit performance and reliability.

REFERENCES:
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patent: 5179303 (1993-01-01), Searles et al.
patent: 5214680 (1993-05-01), Gutierrez et al.
patent: 5218314 (1993-06-01), Efendovich et al.
patent: 5283631 (1994-02-01), Korner et al.

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