[SI-LIST] internal timestep too small in transient analysis HSPICE To: si-list@xxxxxxxxxxxxx In-Reply-To: <20080126072005.DFA777EE413@xxxxxxxxxxxxxxxxxxxx> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-2120719916-1201404794=:6825" Content-Transfer-Encoding: 8bit Message-ID: <498892.6825.qm@xxxxxxxxxxxxxxxxxxxxxxxxxxx> --0-2120719916-1201404794=:6825 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit 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 --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. --0-2120719916-1201404794=:6825 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit <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 <<span class="yshortcuts" id="lw_1201404116_4">li_ece@xxxxxxxxx</span>><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>  <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> --0-2120719916-1201404794=:6825-- ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu