Phase locked loop with a lock detector

Details Phase locked loop with a lock detector Phase locked loop with a lock detector

1998-11-30

2000-10-17

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327157, 327 3, H03L 706

Patent

active

061337692

ABSTRACT:
A phase locked loop comprises a phase locking circuit (16) which includes a phase/frequency detector (18) capable of outputting up and down signals to a charge pump (22) through separate signal paths (24, 26) and a phase lock detector (34) coupled to receive the up and down signals. The phase lock detector (34) determines the difference between the up and down signals from the phase/frequency detector (18) and in response generates a phase lock indicator signal PLL.sub.-- OUT.

REFERENCES:
patent: 3080533 (1963-03-01), edwards
patent: 5784122 (1998-07-01), Nayebi et al.
patent: 5870002 (1999-02-01), Ghaderi et al.
patent: 5978427 (1999-11-01), Kuhara

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