Differential relaxation oscillator

Details Differential relaxation oscillator Differential relaxation oscillator

1989-06-02

1990-12-11

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331113R, H03K 3283

Patent

active

049773810

ABSTRACT:
A relaxation oscillator is disclosed which includes first and second currents for charging and discharging a capacitor wherein the slew rate of the dynamic voltages developed at the terminals of the capacitor remain substantially constant for each frequency of operation which desensitizes the oscillator to the effects of the inherent stray capacitance, and improves the accuracy of the output frequency. A circuit monitors the dynamic voltage across the capacitor and inverts a control signal at opposite polarities of a particular threshold. A bistable circuit provides first and second complementary output signals in response to the control signal from the circuit. The first and second complementary output signals drive a pair of switching transistors which alternate the direction of current flowing through the capacitor so as to provide smooth voltage transitions at the terminals of the capacitor.

REFERENCES:
patent: 3725681 (1973-04-01), Frederiksen
patent: 4292605 (1981-09-01), Rodgers, III
patent: 4492914 (1985-01-01), Hitomi
patent: 4723114 (1988-02-01), D'Arrigo et al.
patent: 4742315 (1988-05-01), Schreilechner

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