[SI-LIST] internal timestep too small in transient analysis

[SI-LIST] internal timestep too small in transient analysis
 HSPICE 
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Shaohua,

This is a well know issue with Spice simulator and has been covered a lot of 
times in the list (look in the archive)

This could come from multiple reasons. The most common one is a discontinuity in
the models. 

The best way to solve your issue is to call Synopsys support.

Joel.

P.S.: There are very good books that explain why and what to do
in this case: Inside Spice by Ron Kielkowski



Msg: #2 in digest
Date: Fri, 25 Jan 2008 11:35:42 -0800 (PST)
From: Shaohua Li <li_ece@xxxxxxxxx>
Subject: [SI-LIST] internal timestep too small in transient analysis
 HSPICE 

I am using HSPICE verion 2007.9 and encountered an error saying "
 internal timestep too small in transient analysis". I didn't set tstep in
 .tran or RUNLVL or ACCURATE. I think the timestep is determined by the
 source sampling interval in the sub circuit by default. Changing the
 circuit connection on the top level can run the program without the running
 error, but I am wondering what might cause 'internal timestep too
 small" error.   
   
  I will apprecaita any discussions. Thank you very much.
   
   
  Shaohua

       
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<pre><tt><tt><tt><tt>Shaohua</tt></tt></tt></tt>,<br><br>This is a well know 
issue with Spice simulator and has been covered a lot of times in the list 
(look in the archive)<br><br>This could come from multiple reasons. The most 
common one is a discontinuity in<br>the models. <br><br>The best way to solve 
your issue is to call Synopsys support.<br><br>Joel.<br><br>P.S.: There are 
very good books that explain why and what to do<br>in this case: Inside Spice 
by Ron Kielkowski<br><br><tt><tt><br><br>Msg: #2 in digest<br>Date: Fri, 25 Jan 
2008 11:35:42 -0800 (PST)<br>From: Shaohua Li &lt;<span class="yshortcuts" 
id="lw_1201404116_4">li_ece@xxxxxxxxx</span>&gt;<br>Subject: [SI-LIST] internal 
timestep too small in transient analysis<br> HSPICE <br><br>I am using HSPICE 
verion 2007.9 and encountered an error saying "<br> internal timestep too small 
in transient analysis". I didn't set tstep in<br> .tran or RUNLVL or ACCURATE. 
I think the timestep is determined by the<br> source
 sampling interval in the sub circuit by default. Changing the<br> circuit 
connection on the top level can run the program without the running<br> error, 
but I am wondering what might cause 'internal timestep too<br> small" error.   
<br>   <br>  I will apprecaita any discussions. Thank you very much.<br>   <br> 
  <br>  Shaohua</tt></tt></pre><p>&#32;
      <hr size=1>Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile. <a 
href="http://us.rd.yahoo.com/evt=51733/*http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
 "> Try it now.</a>
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