Center frequency controlled phase locked loop system

Details Center frequency controlled phase locked loop system Center frequency controlled phase locked loop system

1994-09-12

1995-05-09

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 14, 331 17, 331 34, 360 51, 375376, H03L 707, H03L 710, H03L 718, G11B 2010

Patent

active

054143900

ABSTRACT:
A center frequency controlled phase locked loop system includes a primary phase locked loop having a first voltage controlled oscillator including a first voltage to current converter whose output current drives a first current controlled oscillator to produce the primary clock signal to be locked onto an input signal; a second phase locked loop having a second voltage controlled oscillator including a second voltage to current converter whose output current drives a second current controlled oscillator to produce the synthesized clock signal whose frequency is approximately that of the input signal or integral multiple thereof; and a current copier circuit for copying the output current from the second voltage to current converter and delivering it to the first current controlled oscillator to maintain the center frequency of the first voltage controlled oscillator at approximately the output frequency of the synthesized clock signal.

REFERENCES:
patent: 4641048 (1987-02-01), Pollock
patent: 4980652 (1990-12-01), Tarusawa et al.
patent: 5157355 (1992-10-01), Shikakura et al.
patent: 5258877 (1993-11-01), Leake et al.
patent: 5302919 (1994-04-01), Abe
patent: 5329251 (1994-07-01), Llewellyn
patent: 5343167 (1994-08-01), Masumoto et al.
patent: 5359298 (1994-10-01), Abe

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