Monolithic integrated circuit for an RC oscillator

Details Monolithic integrated circuit for an RC oscillator Monolithic integrated circuit for an RC oscillator

1977-02-07

1978-06-13

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331111, H03K 326

Patent

active

040951944

ABSTRACT:
A monolithic integrated circuit for an RC oscillator includes a differential amplifier acting as a switching stage for comparing a threshold voltage corresponding to the maximum oscillator voltage with the capacitor voltage of the RC circuit. An output of the differential amplifier is connected to the S input of an R-S flip-flop which is set when the capacitor voltage reaches the threshold voltage. A switching transistor has its collector and emitter connected across the capacitor and a base connected to the output of the R-S flip-flop for discharging the capacitor when the flip-flop is set. A second transistor has its base-emitter junction connected across the base-collector junction of the switching transistors so that when the switching transistor has discharged the capacitor to a point that only its collector-to-emitter saturation voltage dropped across it, the second transistor is turned on to provide a signal to the reset input of the flip-flop, thereby inhibiting the discharge of the capacitor and allowing the capacitor to recharge through a current source.

REFERENCES:
patent: 3364441 (1968-01-01), Rogers
patent: 3803516 (1974-04-01), Wilcox

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