High frequency oscillator with a compensated isochronism deficie

Details High frequency oscillator with a compensated isochronism deficie High frequency oscillator with a compensated isochronism deficie

1983-12-12

1986-03-11

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331 70, 331160, 331176, H03B 530

Patent

active

045756899

ABSTRACT:
The high frequency oscillator includes a piezo-electric crystal (1) which is connected to at least two exciter electrodes (3, 4) and means which make it possible to apply on the one hand to the electrodes (3, 4) electric excitation power for the crystal according to a useful vibratory mode which is selected to determine a frequency reference, and on the other hand additional electric power for exciting the crystal according to an overtone vibratory mode which is distinct from the useful vibrational mode. Means (46, 47) are also provided to regulate the electric excitation power of the crystal according to the useful vibratory mode in a predetermined and constant proportion in relation to the additional electric power. The invention makes it possible to compensate, using the isochronism deficiency stemming from the additional vibration on the useful mode, the indirect amplitude-frequency effect stemming from the additional vibration, and vice versa.

REFERENCES:
patent: 3617923 (1971-11-01), Paradysz
patent: 4334168 (1982-06-01), Besson et al.
patent: 4468634 (1984-08-01), Takagi et al.
Valentin et al, "Indirect Amplitude-Frequently Effect in Resonators Working on Two Frequencies," printed in Proceedings 35th Annual Frequency Control Symposium, May 1981.
Valentin, "Internal Heating and Thermal Regulation of Bulk Quartz Resonators," Printed in Proc. 34th Ann. Freq. Control Symposium, May 1980.

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