Pierce crystal oscillator having reliable startup for integrated

Details Pierce crystal oscillator having reliable startup for integrated Pierce crystal oscillator having reliable startup for integrated

1995-03-31

1996-06-18

Pascal, Robert

Oscillators

Solid state active element oscillator

Transistors

331116R, 331117FE, H03B 536

Patent

active

055282016

ABSTRACT:
A Pierce crystal oscillator circuit for a digital integrated circuit has a capacitance element (such as a field effect capacitor) of an appropriate capacitance value disposed on-board the integrated circuit. One lead of the capacitance element is coupled to the input lead of the gain stage of the Pierce oscillator circuit whereas a second lead of the capacitance element is coupled to the output lead of the gain stage. Providing the capacitance element facilitates oscillator startup and reliability by effectively eliminating the upper gain limit for oscillation. Specific circuit embodiments are also disclosed.

REFERENCES:
patent: 3965442 (1976-06-01), Eaton
patent: 3979698 (1976-09-01), Gollinger
Mark A. Unkrich and Robert G. Meyer, Conditions for Start-up in Crystal Oscillators, IEEE Journal of Solid-State Circuits, vol. SC-17, No. 1., pp. 87-90, (Feb. 1982).
Practical Aspects of Analog and Mixed-Mode IC Design (Course Materials), vol. 1, title page and pp. LP-36 to LP-38 (4 pages), (Jul. 1994).
E. Vittoz et al. "High-Performance Crystal Oscillator Circuits: Theory and Application ", IEEE J. Solid-State Circuits, vol. 23, pp. 774-783, (Jun. 1988).
David K. Cheng, "Analysis of Linear Systems", Addison-Wesley Publishing Company, Inc., title page and pp. 280-283, (1961).

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