The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Reply-To: "fred bartoli"
From: "fred bartoli"
References: <firstname.lastname@example.org> <email@example.com>
Subject: Re: SPICE simulation goes awry?
Date: Fri, 13 Dec 2002 15:48:02 +0100
X-Newsreader: Microsoft Outlook Express 5.00.2314.1300
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
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup