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From: Paul Burridge
Subject: Re: SPICE
References: <firstname.lastname@example.org> <8C6F9.email@example.com>
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Date: Fri, 29 Nov 2002 08:23:26 +0000
NNTP-Posting-Date: Fri, 29 Nov 2002 09:52:04 GMT
Organization: Virgin Net Usenet Service
On Wed, 27 Nov 2002 16:42:44 GMT, "Mike" opined
>I don't know of anything that would prevent SPICE from being an RF
>simulator, and I use it regularly to simulate circuits in the 2.5GHz range -
>well into the RF regions. I generally find that my simulation results are
>not terribly different than the silicon results. What was the problem with
>the earlier products you tried?
I'd previously tried EWB/Multisim to model a single RF class C
amplifying stage . I wouldn't have thought that was *too* demanding,
but I was getting like 140 - 200v o/p signals as opposed to 2*Vcc as
it should have been (for a Vcc of 12v) and the waveform o/put was
highly irregular and not the pure sine wave it should have been.
Another niggle was the program didn't seem to register a problem when
I put 12kv on Vcc! One assumes the full model parameters for the BDX36
BJT weren't fully included. I wonder how many more device parameters
weren't included in the other devices in Multisim's libraries.
A friend of mine in the know told me that EWB is no use for
RF/non-linear simulations anyway and suggested Symphony or Serenade
instead. I've yet to try those, though.
"I was going to help him up, but then I thumped him."
Michael Head's plea in mitigation to Weybridge Magistrates, Sept. 1975
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