Voltage variable crystal controlled oscillator

Details Voltage variable crystal controlled oscillator Voltage variable crystal controlled oscillator

1981-07-20

1984-10-23

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 69, 331 70, 331 941, 331116R, 331116FE, 331176, H03B 536, H03L 104, H03L 726

Patent

active

044790961

ABSTRACT:
A highly stable voltage variable crystal controlled oscillator adapted for stand-alone use or for use with an atomic clock for further stabilizing the oscillator. A novel Colpitts crystal oscillator configuration is employed and utilizes an FET amplifier and bipolar emitter follower configured for power gain without phase shift in the feedback circuit. The oscillator output signal is derived through the crystal which then acts as its own low pass filter to improve the purity of the output signal. A novel buffer/amplifier circuit including a grounded gate FET amplifier and coupling transformer assure frequency stability despite wide ranging load impedance variations. A resilient thermal foam material is used to enclose the temperature and shock sensitive components of the oscillator to provide further frequency stability and rugged construction.

REFERENCES:
patent: 4001724 (1977-01-01), Keller
patent: 4068462 (1978-01-01), Duff et al.
Nelson-Jones, L., "Crystal Oven and Frequency Standard" Wireless World, Jun., 1970, pp. 269-273.
Anon, "The Goral Oscillator" Radio Communication, V. 52, N. 5, pp. 359-360, May, 1976.

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