RE: [SI-LIST] : The correct way to short tow nodes in SPICE is?

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From: Pierre-Luc Cantin (plcantin@hyperchip.com)
Date: Fri Oct 20 2000 - 09:44:29 PDT


I suggest that you use 0Volt source to short nodes.
A 0 ohm resistor is likely to be orders of magnitude lower that
the average resistance value. This will lead to ill-condition conductance
matrix, truncation errors or greater simulation time.

Furthermore, a 0V source allows to probe current in a branch.

Pierre-Luc Cantin
Sr. ASIC Designer /
SI Team Leader

plcantin@hyperchip.com
www.Hyperchip.com

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-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Bo
Sent: Friday, October 20, 2000 11:12 AM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : The correct way to short tow nodes in SPICE is?

Hi
I would like to discuss one of the big SPICE myths. I have used several
different spice programs (PSPICE, HSPICE, etc) and I have seen two different
implementations. The problem is that nobody can agree which is the better
implementation of the two. I would like to hear your opinion on this.
The two implementations are:

1) Connect two nodes to each other by putting 0 Ohm resistor.
2) Connect two nodes to each other by putting 0 volt DC source between them.

  
Method 1 typically results in resistance set to some small value other than
0
(by default HSPICE will set it to 1e-5; this can be changed in Hspice). I
have
trying to convince people using this method to at least put several of
resistors in parallel(just in case someone changed default values; in HSPICE
this is easily done my setting multipler M to some high value).

What is your opinion on this?

Regards,
Bo

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