Frequency controlled bias generator for stabilizing clock genera

Details Frequency controlled bias generator for stabilizing clock genera Frequency controlled bias generator for stabilizing clock genera

1996-07-17

1998-08-04

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 17, 331 25, 331 34, 331 57, H03L 7093

Patent

active

057899860

ABSTRACT:
The present invention is a frequency controlled bias generator for stabilizing clock generation circuits. The invention includes a Bias VCO and a clock feedback circuit along with a Phase Frequency Detector for tracking and correcting variations in the frequencies of a High Speed VCO. According to the invention, variations in the frequency of the High Speed VCO are tracked and adjusted across process, temperature, and voltage variations. The invention compares the frequencies of an internal clock generated by Bias VCO with an external clock. When the internal clock frequency is undesirably high or low (based on undesirable variations in process, temperature, and voltage parameters), bias currents provided to the High Speed VCO and the Bias VCO are adjusted such that the frequencies of the Bias VCO and the High Speed VCO are adjusted to offset the variations in process, temperature, and voltage parameters. The bias currents provided to the Bias VCO and the High Speed VCO are matched. The value of the bias currents is dependent upon the relative frequency of the internal clock (generated by the Bias VCO) and the external clock. Further, the internal bias voltage generators of the Bias VCO and the High Speed VCO are also matched. Accordingly, when the frequency of the Bias VCO is adjusted in response to the bias current adjustment, the frequency of High Speed VCO is also adjusted. The adjustment of High Speed VCO's frequency results in an adjustment of the invention's clock signal output.

REFERENCES:
patent: 4567448 (1986-01-01), Ikeda
patent: 4904955 (1990-02-01), Ley
patent: 5523723 (1996-06-01), Arcus et al.
patent: 5565817 (1996-10-01), Lakshmikumar
patent: 5596302 (1997-01-01), Mastrocola et al.

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