From: Paul Burridge
Subject: Re: SPICE simulation goes awry?
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
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Date: Sat, 14 Dec 2002 13:02:36 +0000
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On Fri, 13 Dec 2002 15:48:02 +0100, "fred bartoli"
>I've posted the schematics on a.b.s.e. No errors ?
Terry's said he's verified it so I assume so.
>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
At first sight I thought that was an ammeter. How the heck can you
have a theoretical concept like a current source in a real-world
circuit??? What's it supposed to be doing there and why are there two
separate voltage sources for the supply rail instead of just one
common one? And why only 1volt?
>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.
See above. AFAICS, there's no way this schematic can be translated
into the real world on account of this "current source." I'd be
grateful for an explanation.
"What is now proved was once only imagin'd"
- William Blake, 1793