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Reply-To: "fred bartoli"
From: "fred bartoli"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: SPICE simulation goes awry?
Date: Fri, 13 Dec 2002 15:48:02 +0100
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Organization: Guest of ProXad - France
NNTP-Posting-Date: 13 Dec 2002 15:48:58 MET
Paul Burridge a écrit dans le message :
> On Thu, 12 Dec 2002 14:15:19 +0100, "fred bartoli"
> opined thusly:
> >that is in no way a shortcoming of spice. Neither it is normal, in any
> >I'm pretty sure it's not a bug of the version you use as it will make it
> >totally useless.
> >I'd bet this is a big error in one macromodel you use. But without a
> * B2 Spice
> * B2 Spice default format (same as Berkeley Spice 3F format)
> ***** main circuit
> Q1 6 5 3 bjt_npn_generic
> L1 4 0 3.2uh
> C1 5 3 1200pf
> C2 3 0 1200pf
> Icc 3 0 DC 1ma
> V1 6 0 DC 1
> Vbb 7 0 DC 1
> C4 5 4 250pf
> L2 7 5 1H
> IV_RFout 3 0 0
> R1 3 0 1meg
> R2 4 0 1meg
> .model bjt_npn_generic npn
> .OPTIONS gmin = 1E-12 reltol = 1E-4 itl1 = 500 itl4 = 500
> + rshunt = 100G
> .TRAN 100ns 11us 1us 100ns uic
> There you go. Got there in the end!
> Now: any views on why the extended simulation goes nuts?
I've posted the schematics on a.b.s.e. No errors ?
Ok, now for your pb, even with V1 (and Vbb) set to 0V you still have a power
source : the Icc 1mA current source in the emetter path you didn't tell us
So, your simulation results are *ALL* corrects, for the "0V dc supply", but
also for the "under 0V and amazingly high output". I gave you the hint for
the Icc source but the explication up to you. You can come back with the
answer and we'll happily comment about.
> "What is now proved was once only imagin'd"
> - William Blake, 1793
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