Method and apparatus for producing a temperature stable frequenc

Details Method and apparatus for producing a temperature stable frequenc Method and apparatus for producing a temperature stable frequenc

1997-09-04

1998-11-03

Grimm, Siegfried H.

Oscillators

Plural oscillators

Oscillator used to vary amplitude or frequency of another...

331158, 331176, H03L 102

Patent

active

058314857

ABSTRACT:
A method and apparatus for producing a temperature stable frequency at reduced cost. Advantage is taken of an existing, relatively temperature insensitive, low frequency and low cost watch crystal and an existing, high frequency, low cost, but relatively temperature sensitive system clock. A calibration module coupled to the watch crystal and clock calibrates the watch crystal to a reference frequency at a reference temperature and calibrates the clock to the watch crystal at an operating temperature, to relate the clock frequency to the reference frequency at any operating temperature and thereby provide a high precision, relatively temperature insensitive time or frequency base at low cost.

REFERENCES:
patent: 4344046 (1982-08-01), Zumsteg
patent: 4415870 (1983-11-01), Zumsteg
patent: 4443116 (1984-04-01), Yoshida et al.
patent: 4537515 (1985-08-01), Dinger et al.

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