Voltage controlled oscillator using differential CMOS circuit

Details Voltage controlled oscillator using differential CMOS circuit Voltage controlled oscillator using differential CMOS circuit

1989-10-02

1990-08-07

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331144, H03K 3354

Patent

active

049471406

ABSTRACT:
A voltage controlled oscillator comprises a differential circuit composed of first and second MOS transistors each having a drain connected to a gate of the other MOS transistor and each having a source connected to a constant current source, a capacitor connected to couple between the sources of the first and second MOS transistors, a first current mirror circuit having an input connected to the drain of the first MOS transistor and an output connected to the second MOS transistor, and a second current mirror circuit having an input connected to the drain of the second MOS transistor and an output connected to the first MOS transistor. A current value of the constant current sources is controlled to change an oscillation frequency.

REFERENCES:
patent: 3857110 (1974-12-01), Grebene
patent: 4717892 (1988-01-01), Hitomi
Finvers et al., "Analysis of a Source--Coupled CMOS Multivibrator", "IEEE Transactions on Circuits and Systems", vol. 35, No. 9, Sep. 1988.

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