Digital lock detector for phase-locked loop

Details Digital lock detector for phase-locked loop Digital lock detector for phase-locked loop

1997-04-10

1999-06-01

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327150, 327159, H03L 708

Patent

active

059091304

ABSTRACT:
A phase lock detector circuit is disclosed that generates delayed versions of both a reference clock signal and a synthesized clock signal. From the delayed signals, first and second control signals that are pulses are generated. The pulses are passed through respective delays of predetermined durations and then clocked into respective shift registers by the latched signal of the opposite input. The shift register outputs are logically combined and shifted into a third shift register. Outputs from the third shift register are logically combined to ascertain whether a phase-lock loop is phase lock. The lock detector circuit may include a lock-out circuit to disable the phase lock detector circuit upon detecting phase lock.

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"Phase-Locked Loops, Theory, Design and Application" by Roland E. Best, (2nd Ed.), pp. 93-165, published by McGraw-Hill, Inc.

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