Precision CMOS oscillator circuit

Details Precision CMOS oscillator circuit Precision CMOS oscillator circuit

1989-04-10

1990-02-27

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331143, H03K 300

Patent

active

049049607

ABSTRACT:
A CMOS relaxation oscillator is disclosed employing a pair of capacitors and individual charging means. A noninverting amplifier comprising two cascaded inverters is provided with a transmission gate input circuit that alternately switches the amplifier input between the two capacitors. A pair of switches coupled respectively across the capacitors alternately discharge them. The resulting oscillator has a frequency determined by the capacitor charging periods. Accordingly, the frequency and duty cycle can be predetermined as desired. The circuit can also be made either power supply tunable or power supply independent.

REFERENCES:
patent: 4521748 (1985-06-01), Ryczek et al.

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