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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 |
User-agent: |
KMail/4.10.2 (Linux/3.8.0-21-generic; KDE/4.10.2; x86_64; ; ) |
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?
Orestes.