Adjustment of the frequency-temperature characteristics of cryst

Details Adjustment of the frequency-temperature characteristics of cryst Adjustment of the frequency-temperature characteristics of cryst

1985-02-28

1986-08-19

Wan, Gene

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331158, H03L 100, H03B 532

Patent

active

046072390

ABSTRACT:
The frequency-temperature characteristic of the piezoelectric resonator in a temperature compensated crystal oscillator is adjusted by the inclusion of an equivalent inductive reactance connected in series with a piezoelectric crystal resonator coupled to an oscillator circuit, with the equivalent inductive reactance being realized in the form of an inductorless Maxwell type bridge circuit containing the resonator. Such an arrangement provides a much larger variation in the temperature-frequency characteristic than can be realized with a conventional capacitor in series with the piezoelectric resonator.

REFERENCES:
patent: 3995233 (1976-11-01), Waku
"Apparent Orientation Shifts of Mass-Loaded Plate Vibrators", A. Ballato, oceedings of IEEE, vol. 64, Sep. 1976, pp. 1449-1450.
Temperature Compensated Crystal Oscillator (TCXO) Design Aids: Frequency-Temperature Resonator Characteristics as Shifted by Series Capacitors, A. Ballato, Technical Report, ECOM-4498, U.S. Army Electronics Comman, Fort Monmouth, N.J., May, 1977, 59 pages.
"Frequency-Temperature-Load Capacitance Behavior of Resonators for TCXO Application", IEEE Transactions on Sonics and Ultrasonics, A. Ballato, vol. SU-25, No. 4, Jul., 1978, pp. 185-191.

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