Controllable frequency, temperature compensated piezoelectric os

Details Controllable frequency, temperature compensated piezoelectric os Controllable frequency, temperature compensated piezoelectric os

1988-05-16

1989-05-23

Mis, David

Oscillators

Electromechanical resonator

Crystal

331116R, 331176, 331177V, H03B 536, H03L 102

Patent

active

048334260

ABSTRACT:
A temperature-compensated piezoelectric oscillator of high-spectral purity, capable of being controlled in frequency, consists of a compensation circuit, a processing circuit, a phase-shifting circuit, containing the piezoelectric resonator, and an oscillating circuit. To obtain high spectral purity, it is proposed to use a low-pass filter, placed between the compensation circuit and one of the inputs of the processing circuits, to process the signal coming from the compensation circuit. This filter eliminates the influence of the temperature noise coming from the compensation circuit. The invention can be applied to controllable frequency, temperature compensated piezoelectric oscillators where high spectral purity is sought.

REFERENCES:
patent: 3831111 (1974-08-01), Lafferty
patent: 4088968 (1978-05-01), Pradal et al.
Toute L'Electronique, No. 450, Jan. 1980, pp. 13-26, Paris, G. Mourier "Les Oscillateurs pilotes modulaires".
IEEE Trans. on Instru. and Meas., vol. IM-28, No. 3, Sep. 1979, pp. 188-193; J. Vanier, "Transfer of Frequency Stability from . . . "

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