FET Relaxation oscillator with reduced sensitivity to supply vol

Details FET Relaxation oscillator with reduced sensitivity to supply vol FET Relaxation oscillator with reduced sensitivity to supply vol

1979-07-16

1981-04-07

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331175, H03K 3023

Patent

active

042609593

ABSTRACT:
An MOS oscillator is provided which has reduced sensitivity to power supply voltage variations and to threshold processing variations. A plurality of field effect transistors are connected in series to provide reference voltages to establish two trip points for a comparator. A second input of the comparator is connected to a capacitor whose charging and discharging is controlled by the output of the comparator. The plurality of series connected transistors form unsymmetrical active device dividers. The unsymmetrical configuration is chosen such that power supply variations and threshold variations cancel much of the charge current variation due to these variations. Matched current sources are used throughout the oscillator circuit.

REFERENCES:
patent: 3742384 (1973-06-01), Breitzmann et al.
patent: 3904988 (1975-09-01), Hsiao

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