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From: James Meyer
Subject: Re: Transistor amplifiers v. frequency in SPICE
References: <3E20D1C8.166C@sneakemail.com> <firstname.lastname@example.org>
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Date: Mon, 13 Jan 2003 00:02:45 GMT
NNTP-Posting-Date: Sun, 12 Jan 2003 19:02:45 EST
On 12 Jan 2003 05:35:27 -0800, email@example.com (Paul Burridge) wroth:
>Mike Monett wrote in message news:<3E20D1C8.166C@sneakemail.com>...
>> But first thing is to get SPICE to plot the AC response curves for you.
>> Lets see if we can help!
>Okay, Mike, here's the relevant bit from the deck file:
>.OPTIONS gmin = 1E-12 reltol = 1E-4 itl1 = 500 itl4 = 500
>+ rshunt = 1G
>.AC Dec 200 20k 10Meg
>It seems to show a uniform flat Vout of zero volts from 200K to 10M,
>which of course is in contrast to the more sensible output
>levels the .TA generates. I would have expected an AC sweep to show
>Vout falling off with frequency, but it's just Zilcho the whole way through.
>Give it a try and see what you think. BTW, what is the "PH_DEG" plot
>that always seems to be generated supposed to us?
The line ".AC Dec 200 20k 10Meg" above turns on the AC small signal
analysis and sets the frequency span. What it *doesn't* do is identify the
signal source and its amplitude.
Zero volts in from an unidentified source will always give you zero
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