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From: email@example.com (Allan Herriman)
Subject: Re: SPICE model of XTAL
Date: Tue, 10 Dec 2002 04:50:29 GMT
Organization: Agilent Technologies
NNTP-Posting-Date: Tue, 10 Dec 2002 04:50:31 +0000 (UTC)
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On Mon, 09 Dec 2002 21:05:45 +0000, John Devereux
>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.
Is there any reason that you can't set the initial voltage (or
current) on one of the C or L elements to inject the right amount of
energy into the tank so that it starts oscillating at full amplitude
right after "turn on"?
This is something that you can do in simulation that you can't do in
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