Apparatus and method for setting VCO free-running frequency

Details Apparatus and method for setting VCO free-running frequency Apparatus and method for setting VCO free-running frequency

1999-05-04

2000-08-29

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 1A, 331 11, 331 16, 331179, H03L 700

Patent

active

061114715

ABSTRACT:
The present invention provides an apparatus for setting the free-running frequency of a VCO to a reference frequency. The apparatus comprises frequency range means for setting the VCO within a VCO frequency range among a plurality of VCO frequency ranges. First counting means are operable to count to a first value at the VCO frequency rate and to provide a first ending signal when the first value is reached. Second counting means are operable to count to a second value at the reference frequency rate and to provide a second ending signal when the second value is reached. The second counting means are also operable to provide a reference count value when the first value is reached by the first counting means. A state machine is responsive to the first and second counting means for selecting a VCO frequency range among the plurality of VCO frequency ranges such that the VCO free-running frequency obtained through the selected range gives the closest value to the reference frequency. The state machine comprises means for decrementing the reference count value provided by the second counting means and also means for comparing the decrementation duration to the counting duration of the second counting means. The selection of the best VCO frequency range is based on this comparison.

REFERENCES:
patent: 5182528 (1993-01-01), Zuta
patent: 5592129 (1997-01-01), Fried et al.
patent: 5610560 (1997-03-01), Sauer et al.
patent: 5777520 (1998-07-01), Kawakami

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