Apparatus and method for acquiring phase lock timing...

Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction

Reexamination Certificate

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C375S371000, C375S373000

Reexamination Certificate

active

06990163

ABSTRACT:
The present invention is a method of acquiring phase lock to a data signal in a digital channel having a digital feedback loop. The method generally comprises: (A) applying the data signal to an analog phase lock loop configured to have (i) at least two poles and (ii) presend intermediate output signal frequency locked to the data signal; (B) applying the data signal and the intermediate output signal to the digital channel; and (C) adjusting a delay constant for the digital feedback loop to (i) compensate for variations in phase between the data signal and the intermediate output signal and (ii) acquire phase lock by using a single pole in the digital channel.

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