Circuit and method of extending the linear range of a phase freq

Details Circuit and method of extending the linear range of a phase freq Circuit and method of extending the linear range of a phase freq

1999-02-01

2000-08-08

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 7, 327 12, 327 5, 327148, 327151, 327157, G01R 2500

Patent

active

061007218

ABSTRACT:
A wireless communication system (10) uses a phase detector (28) having a first pair of flip-flops (50, 56) for detecting the phase difference between an input frequency and a reference frequency. The first pair of flip-flops control current sources (66, 70) in the charge pump of the phase detector to modulate the error signal. A second pair of flip-flops (52, 58) detect when the input frequency is more than 2.pi. ahead of or behind the reference frequency. The second pair of flip-flops increment and decrement a counter (54) which in turn controls additional current sources (78-88) in the charge pump. The additional current sources extend the linear operating range of the error signal when the phase error exceeds .+-.2.pi..

REFERENCES:
patent: 4280099 (1981-07-01), Rattlingourd
patent: 4970475 (1990-11-01), Gillig
patent: 5349309 (1994-09-01), Fujii
patent: 5604775 (1997-02-01), Saitoh et al.
patent: 5610954 (1997-03-01), Miyashita
patent: 5727038 (1998-03-01), May et al.
patent: 5744991 (1998-04-01), Jefferson et al.

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