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From: John Devereux
Subject: Re: SPICE model of XTAL
Date: Mon, 09 Dec 2002 21:05:45 +0000
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NNTP-Posting-Date: 09 Dec 2002 21:01:20 GMT
Paul Burridge wrote:
>I tried to simulate a XTAL oscillator using spice, but for some
>peculiar reason, there's no field in which to specify the resonant
>frequency; only fields for capacitive loading and stuff like that. Is
>this normal or do I have a faulty s/ware package?
In addition to the other answers, I would like to say that I
found it surprisingly difficult to simulate xtal oscillators
in spice (after I had made a model). The problem is the very
high Q of crystals. You may need to allow many thousands of
cycles of circuit operation (in transient analysis mode) to
build up a detectable oscillation.
You still need to have plenty of time steps per cycle, so
you end up with quite long run times. Plotting the results
can be a problem too, due to the enormous number of points.
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