Integrated crystal oscillator with circuit for limiting crystal

Details Integrated crystal oscillator with circuit for limiting crystal Integrated crystal oscillator with circuit for limiting crystal

1991-02-28

1992-09-22

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331116FE, 331160, 331183, H03B 536, H03L 502

Patent

active

051500817

ABSTRACT:
On an integrated circuit, a power limiting circuit is added to a crystal oscillator for limiting power dissipation in the crystal to a prescribed safe power dissipation range. The power limiting circuit includes a Pierce design crystal-controlled oscillator coupled to a self-stabilizing circuit. The self-stabilizing circuit detects the oscillation amplitudes of the crystal controlled oscillator. The self-stabilizing circuit prevents the oscillations from exceeding a predetermined maximum power dissipation level for the crystal. The self-stabilizing circuit includes a means for detecting oscillation amplitudes and means for limiting the gain of the crystal controlled oscillator circuit. Therefore, independent of manufacturing tolerances from integrated circuit to integrated circuit, the self-stabilizing circuit assures that the maximum power dissipation level of the crystal is not exceeded.

REFERENCES:
patent: 3982210 (1976-09-01), Gehrke
patent: 4651113 (1987-03-01), Fujita
Eric A. Vittoz et al., "High-Performance Crystal Oscillator Circuits: Theory and Application", IEEE Journal of Solid-State Circuits, vol. 23, No. 3, pp. 774-782, Jun. 1988.
Eric A. Vittoz, "Quartz Oscillators for Watches", Proceedings, International Congress of Chronometry, pp. 131-140 (1979).

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