Overtone crystal oscillator

Details Overtone crystal oscillator Overtone crystal oscillator

1986-07-15

1987-11-24

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, H03B 536

Patent

active

047092181

ABSTRACT:
An overtone crystal oscillator includes a crystal vibrator, a CMOS circuit connected in parallel to the crystal vibrator, and two load capacitors connected to the input and output of the CMOS circuit, respectively. The capacitors have respective capacitances C.sub.g and C.sub.d determined to satisfy at least one of following two conditions wherein the first condition is that an oscillation starting resistance R.sub.KN of a desired N-th overtone is sufficiently larger than an effective resistance R.sub.QN of the crystal vibrator of the N-th overtone, the oscillation starting resistance being expressed as:

REFERENCES:
patent: 4376918 (1983-03-01), Masuda et al.
Parzen, Design of Crystal and Other Harmonic Oscillators, pp. 153-160, 1983, John Wiley & Sons, New York.

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