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Re: [Help-gnucap] Possibly a bug?

From: Orestes Mas
Subject: Re: [Help-gnucap] Possibly a bug?
Date: Thu, 23 May 2013 10:47:04 +0200
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El Dijous 23 Maig 2013, a les 01:40:29, al davis va escriure:
> To answer your question of why not automatically do an op first
> ...   It's more flexible this way.  Instead of forcing a nominal
> static condition, gnucap uses the most recent point from the
> most recent dc, op, or tran, which lets you do AC analysis at
> non-static points.
> For a simple example, consider a class-B amplifier, underbiased
> a little so there is a crossover notch.  The usual op would set
> the operating point in the middle of the notch, so the AC
> analysis would be useless, other than to show how bad the notch
> is.
> Run a transient analysis to get it out of the notch, stop there,
> do AC there.  See how it varies with signal swing.  Try it with
> different frequencies in the transient analysis.  The results
> can be very different from any static guess.

Thanks, Al, for this enlightening explanation.

My final question, then, is: why gnucap does not automatically substitute zero 
resistance with "short" value set in options?


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