Relaxation oscillator not restricted by FET threshold

Details Relaxation oscillator not restricted by FET threshold Relaxation oscillator not restricted by FET threshold

1978-11-06

1980-08-26

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

H03K 326

Patent

active

042197872

ABSTRACT:
In a relaxation oscillator having its frequency determined by the charge rate of a capacitor, a switch means is controlled through a field effect transistor to discharge the capacitor at a predetermined charge level when channel current through the FET is reduced as voltage across the capacitor approaches the voltage supply level. The charge rate of the capacitor is substantially unaffected by the FET and substantially no power is drawn to control the switch means while the capacitor is charging. The duty cycle of the output level may be readily controlled in this oscillator without substantially affecting the low power attributes thereof.

REFERENCES:
patent: 3883825 (1975-05-01), Cohen
patent: 3995232 (1976-11-01), Laugesen
patent: 4001722 (1977-01-01), Patel et al.

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