Dual adjust current controlled phase locked loop

Details Dual adjust current controlled phase locked loop Dual adjust current controlled phase locked loop

1996-01-11

1997-11-25

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331DIG2, 331 34, 331 57, H03L 7099

Patent

active

056916698

ABSTRACT:
A dual adjust current-controlled phase locked loop is provided for allowing multiple-gain frequency acquisition of a signal. The dual adjust current-controlled phase locked loop includes a phase detector responsive to a reference signal and a synthesized signal for producing a phase error signal; a controller responsive to the phase error signal for generating coarse and fine adjust control signals; and a dual adjust current-controlled oscillator responsive to the coarse and fine adjust control signals for adjusting the oscillating frequency of the synthesized signal. The dual adjust current controlled oscillator includes a differential current controlled ring oscillator comprising a series of delay elements. Each delay element includes a high gain circuit responsive to the coarse adjust control signal and a low gain circuit responsive to the fine adjust control signal.

REFERENCES:
patent: 4546331 (1985-10-01), DaSilva et al.
patent: 4573026 (1986-02-01), Curtis et al.
patent: 4795985 (1989-01-01), Gailbreath et al.
patent: 4810977 (1989-03-01), Flugstead et al.
patent: 5206889 (1993-04-01), Unkrich
patent: 5302920 (1994-04-01), Bitting
patent: 5490182 (1996-02-01), Arai
patent: 5559473 (1996-09-01), Anderson et al.
U.S. application No. 08/506,432, Meier et al., filed Jul. 24, 1995.

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