Method and circuit for producing a control voltage for a VCO

Details Method and circuit for producing a control voltage for a VCO Method and circuit for producing a control voltage for a VCO

2006-11-07

2006-11-07

Lee, Benny (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C327S156000

Reexamination Certificate

active

07132897

ABSTRACT:
The control voltage for a VCO (voltage controlled oscillator) is produced in a phase locked loop which in turn is controlled by a computer (40) including an integrated analog circuit (42). First the oscillator control voltage is set to a predetermined value. Then, voltage varying steps are performed. For performing these steps, the circuit includes a main frequency divider and a reference frequency divider both functioning as counters. The beginnings of the counting of each divider are synchronized with each other. The oscillator control voltage is increased by a predetermined voltage difference or increment when the reference divider completes its counting period prior to the main divider completing its counting. The oscillator control voltage is decreased by a predetermined voltage difference or decrement when the main divider finishes its counting period prior to the reference divider finishing its count.

REFERENCES:
patent: 6317006 (2001-11-01), Welland et al.
patent: 6566966 (2003-05-01), Bellaouar et al.
patent: 6710664 (2004-03-01), Humphreys et al.
patent: 2003/0048139 (2003-03-01), Chien et al.
patent: 0993122 (2000-04-01), None
Wilson et al., A CMOS Self-Calibrating Frequency Synthesizer, IEEE Journal of Solid-State Circuits, vol. 35, No. 10, Oct. 2000, pp. 1437-1444.

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