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From: ayman@eecs.umich.edu
Newsgroups: comp.lsi.cad
Subject: Modeling of ideal diodes in (H)spice
Keywords: simulation, spice, modeling, convergence
Message-ID: <1991Mar16.211609.9149@zip.eecs.umich.edu>
Date: 13 Mar 91 08:00:00 GMT
Sender: news@zip.eecs.umich.edu
Organization: ACAL, EECS, UM-AA
Lines: 22

I am trying to simulate a circuit in Hspice, where all diodes are modeled by
a switched voltage source in series with a resistor.

        _______ \__________/\/\/\/\/\______
        +                     Rd           |              switches closes when
                                           |              Vd becomes greater
        Vd                             ----+----  Vi      than Vi
                                          ===
        -                                  |
        -----------------------------------+

I tried the voltage-controlled resistor switch (Rd = 1M for Vd < Vi, Rd = 100
for Vd > Vi), but the dc solution didn't converge.
Any suggestions on how to make the solution converge? Or, are there other ways
to model the diodes to get a convergent solution?
Thanks.

--------------------------------------------
- Ayman I. Kayssi (ayman@eecs.umich.edu)   -
- Advanced Computer Architecture Lab.      -
- EECS Dept., Univ. of Michigan, Ann Arbor -
--------------------------------------------