Relaxation oscillator with plural constant current sources

Details Relaxation oscillator with plural constant current sources Relaxation oscillator with plural constant current sources

1979-08-20

1981-09-29

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331143, 331177R, H03K 3023, H03K 3282

Patent

active

042926041

ABSTRACT:
In an oscillatory signal generator circuit exceptional frequency stability is insured by the use of interrelated constant current sources (520, 521, 522) that provide an insensitivity to supply voltage variations over a wide range. Two of the current sources determine the duty cycle by controlling the charge and discharge current of a capacitor (C) in the circuit. A third current source determines the voltage swing on the capacitor. By varying the current output from the third current source, the generator circuit provides a variable frequency signal.

REFERENCES:
patent: 2350797 (1944-06-01), Morland et al.
patent: 3831113 (1974-08-01), Ahmed
patent: 3886485 (1975-05-01), Takahashi
patent: 3924202 (1975-12-01), Craft
patent: 3946330 (1976-03-01), Takahashi
patent: 4161703 (1979-07-01), Nutz
patent: 4205279 (1980-05-01), Beutler

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