Low frequency oscillator using capacitive charging/discharging

Details Low frequency oscillator using capacitive charging/discharging Low frequency oscillator using capacitive charging/discharging

1993-10-07

1995-05-02

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331113R, 331143, H03K 3023, H03K 3282

Patent

active

054123500

ABSTRACT:
A low-frequency oscillator whose duty ratio can be simply controlled includes a charging and discharging circuit for charging a capacitor via a constant current source and then discharging the capacitor according to a discharge control signal. A voltage comparator compares the voltage across the capacitor with a reference voltage. A monostable multivibrator, triggered by the output of the voltage comparator, generates the discharge control signal. The duration of the discharge is determined according to the RC time constant of the monostable multivibrator, to thereby generate a rectangular waveform having an accurately controlled duty ratio.

REFERENCES:
patent: 3795893 (1974-03-01), Kritz et al.
patent: 4295062 (1981-10-01), Mihalich et al.
patent: 4513258 (1985-04-01), Jamiolkowski et al.
patent: 4644300 (1987-02-01), Ibe et al.

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