Oscillator with capacitor charged and discharged by current prop

Details Oscillator with capacitor charged and discharged by current prop Oscillator with capacitor charged and discharged by current prop

1982-07-26

1985-01-15

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331113R, H03K 3282, H03K 452

Patent

active

044940882

ABSTRACT:
A silicon integrated oscillator circuit is connected with a capacitor and produces a highly precise and stable triangular output voltage. Both the charge current and the discharge current are proportional to one reference current. A switching circuit terminates the charge and discharge intervals when the capacitor voltage reaches a level that is equal to intermediate points on first and second resistive-voltage-divider circuits, respectively. This is accomplished by a differential-transistor-pair comparator having the base of one transistor connected to a high voltage one of the reference points and a third transistor, which is connected collector to emitter across the one transistor, having a base connected to a low voltage one of the reference points.

REFERENCES:
patent: 4374366 (1983-02-01), McGinn
patent: 4418323 (1983-11-01), Tokumo et al.

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