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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
Subject: Re: SPICE?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
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Date: Sun, 29 Sep 2002 21:09:09 +0100
NNTP-Posting-Date: Sun, 29 Sep 2002 21:09:59 BST
"Peter Nolan" wrote in message
> Hello Kevin,
> I have the complete high-frequency equivalent circuit for the
> amplifier in front of me along with formulae for the current and
> gains(Electronics for the Physicist by Delaney).
I doubt it somehow. Its actually quite complicated in full detail.
>I do not see however a
> comparison between theory and experiment. I have this thought in the
> my mind that it was not possible to model even a single transistor
> well but clearly I'm very much mistaken. The low frequency and high
> frequency equivalent circuits are different
Only by deliberate construction. That is, they use approximations.
>and I think this led me to
> believe that the entire frequency response is the result of stitching
> together these two responses and that seemed somehow unsatisfactory to
This is not really what happens.
There is no reason why there can not be, and indeed there is, an
equivalent circuit that is correct across the whole range of
frequencies. Rest assured, that with decent models for the devices,
spice is very accurate.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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