Wide frequency range VCO with low jitter

Details Wide frequency range VCO with low jitter Wide frequency range VCO with low jitter

1996-03-06

1997-09-09

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

331 57, 331175, H03B 504, H03L 7099

Patent

active

056660880

ABSTRACT:
Each starved-inverter of a voltage controlled ring oscillator has an output transfer gate associated therewith. The pair of complementary switches composing a transfer gate being controlled in common with the relative current generators of the starved-inverter stage, by a frequency control voltage and by a voltage difference between a supply voltage and the control voltage, respectively. The frequency produced by the oscillator is linearly proportional to the control voltage and inversely proportional to the square root of the supply voltage, for an enhanced noise immunity and improved frequency stability.

REFERENCES:
patent: 4912433 (1990-03-01), Motegi et al.
patent: 5285483 (1994-02-01), Ogawa et al.
Schuster et al., "On-Chip Test Circuitry for a 2-ns Cycle, 512-kb CMOS ECL SRAM," IEEE Journal of Solid-State Circuits, 27:7, Jul. 1992, pp. 1073-1079.
Vanstraelen et al., "Design implications of a p-well CMOS technology for the realization of monolithic integrated pixel arrays," Nuclear Instruments and Methods in Physics Research, A305:3, pp. 541-548. Aug. 1, 1991.

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