Dual-loop phase-locked loop

Details Dual-loop phase-locked loop Dual-loop phase-locked loop

1997-11-13

1998-12-29

Mottola, Steven

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 17, 331 1A, 331108C, 327157, H03L 708

Patent

active

058545751

ABSTRACT:
An integrated circuit phase-locked loop includes a phase/frequency detector, a charge pump, and a voltage-controlled oscillator (VCO) which are coupled together in series. The VCO has first and second VCO control inputs, and has a VCO output which is coupled to the phase/frequency detector. An off-chip loop filter input is coupled between the charge pump and the first VCO control input for coupling to an off-chip loop filter. An on-chip loop filter is coupled between the first VCO control input and the second VCO control input. The VCO has a lower voltage-to-frequency gain from the first VCO control input to the VCO output than from the second VCO control input to the VCO output.

REFERENCES:
patent: 4857866 (1989-08-01), Tateishi
patent: 5144156 (1992-09-01), Kawasaki
patent: 5539344 (1996-07-01), Hatakenaka
patent: 5659588 (1997-08-01), Fiedler

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