Oscillator cirucit independent or parasitic capacitors

Details Oscillator cirucit independent or parasitic capacitors Oscillator cirucit independent or parasitic capacitors

1990-10-29

1992-07-07

Pascal, Robert J.

Oscillators

Relaxation oscillators

H03B 500

Patent

active

051286343

ABSTRACT:
An oscillator circuit providing an output signal having a predetermined frequency of oscillation includes a comparator circuit having first and second inputs and an output, the first input being coupled to a node, and the second input being coupled to a terminal at which a reference voltage is applied. A capacitor is coupled between the first input of the comparator circuit and the output of the comparator circuit wherein the capacitor has parasitic capacitances associated therewith. A switchable current circuit responsive to the output of the comparator circuit for pushing current into the node when the output of the comparator circuits is in a first logic state thereby charging the capacitor, and for pulling current out of the node when the output of the comparator circuit is in a second logic state thereby discharging the capacitor wherein the predetermined frequency of oscillation of the oscillator circuit is independent of the parasitic capacitor.

REFERENCES:
patent: 4623852 (1986-11-01), Abou et al.

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