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From: "red rover"
Subject: Re: Another SPICE problem!
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 9 Jan 2003 19:55:19 -0500
NNTP-Posting-Date: Thu, 09 Jan 2003 19:53:07 EST
Organization: Bell Sympatico
H'mmm. I was a spice guru about 9 years ago
but haven't used it since. It all seems like
a distant blur but while reading this my brain
gave one of those automatic responses ....
"Don't you just overide the default value of ITL4
to equal 50?"
Give that a try and I will try and dust of the cobwebs.
"Paul Burridge" wrote in message
> Hi all,
> Just working through an example circuit of a common emitter amplifier
> from the Roberts and Sedra SPICE handbook. The circuit uses bypass and
> coupling capacitors all of the value 1GF - a ridiculously high value
> contrived to enable the effects of bandwidth attenuation at low
> frequencies to be eliminated from the simulation runs. Problem being,
> when I run the sim, I get a 'time-step too small' error message. On
> looking this up, one of the suggested remedies was to "make the
> circuit more realistic" so the obvious thing to do was to change the
> cap values to something more appropriate to the real world. I chose
> 100uF all round. Result: works perfectly. So why does Roberts and
> Sedra expect one to be able to run a simulation that won't work with
> the suggested values?
> "What is now proved was once only imagin'd"
> - William Blake, 1793
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