Voltage controlled crystal oscillator with reduced oscillations

Details Voltage controlled crystal oscillator with reduced oscillations Voltage controlled crystal oscillator with reduced oscillations

1984-10-29

1986-02-18

LaRoche, Eugene R.

Oscillators

With parasitic oscillation control or prevention means

331116R, 331158, 331177R, H03B 104, H03B 536

Patent

active

045715580

ABSTRACT:
The invention relates to a crystal controllable oscillator circuit. The oscillator includes an amplifier and an oscillation sustaining feed-back loop coupled between an output and an input of the amplifier the loop including two integrators in series for inhibiting oscillation at crystal overtones. Each integrator provides 90.degree. phase shift independently of the oscillators defining RC product which determines only the gain thereby making the oscillator less sensitive to variations in circuit time constants due to temperature and manufacturing tolerance effects. The invention is particularly suitable for incorporating in integrated circuit form where only a single pin connection is required for the controlling crystal.

REFERENCES:
patent: 3676801 (1972-07-01), Musa
patent: 3973221 (1976-08-01), Jett, Jr.

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