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Re: [Gnucap-devel] Logic device (U) and switch level simulation
From: |
Al Davis |
Subject: |
Re: [Gnucap-devel] Logic device (U) and switch level simulation |
Date: |
Sun, 14 Sep 2003 12:54:27 -0400 |
User-agent: |
KMail/1.5.3 |
On Friday 12 September 2003 04:36 pm, Willis Shih wrote:
> There is a U: logic device in gnucap for logic mode
> simulation. How to run logic mode simulation on switch level
> devices like transmission gate logic? U device seems not
> suitable for switch level devices.
You could use a switch (S device).
The down side of this is that it doesn't have the "implicit
mixed mode" automatic mode switching. You may not need this.
The gnucap S device is more efficient than the spice equivalent.
What is really needed is a switch level "level" for the mosfet,
and to enable the mode switching there. Doing this also opens
up an interesting new homotopy method, for improving
convergence.
> BTW, is there any preprocessor to parse hspice netlists and
> models?
I keep hoping someone will make a configurable preprocessor to
handle the many variants of spice formats. Gnucap will take
some HSpice extensions directly.