Method and apparatus for a crystal oscillator using piecewise li

Details Method and apparatus for a crystal oscillator using piecewise li Method and apparatus for a crystal oscillator using piecewise li

1996-07-12

1997-11-25

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331176, H03B 532, H03L 102

Patent

active

056916710

ABSTRACT:
A method for temperature compensating a crystal oscillator (16) which includes a plurality of operational amplifiers (18,20) being driven by a temperature-dependent diode signal (28). The amplifiers (18,20) all operate across the entire temperature range of the crystal oscillator (16). Each amplifier (18,20) is adjusted to provide an gain (34,40,42,44,46) having a piecewise linear signal having odd symmetry about an inflection temperature (38) of a Bechmann curve of a crystal oscillator (16). The gain, slope and clipping of each amplifier (18,20) is adjusted such that the amplifier gains (34,40,42,44,46), when summed over the entire temperature range, provide a compensation signal (30) proportional to the Bechmann curve. The compensation signal (30) is subsequently applied to a tuning circuit of the crystal oscillator (16) such that a temperature compensated output (32) is obtained.

REFERENCES:
patent: 5041799 (1991-08-01), Pirez
patent: 5473289 (1995-12-01), Ishizaki et al.
patent: 5500618 (1996-03-01), Comer

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