Nancy, From node 2 onward, you have two capacitors c1 and c2 in series. Spice does not know the voltage on node 3 since there can be any charge at that location, and the initial conditions are undefined. From your circuit, it looks like you want to see those two capacitors in series without outside interference. For that, you can let Hspice know that node 3 starts with 0 volts. If that is what you want to accomplish, add a large resistor to node 3: Rlarge 3 0 1e8 That should take care of your problem. Mike ----------------------------------------------------------------- Michael Khusid Ansoft Corporation HF/SI Application Engineer 25 Burlington Mall Road, 6th floor Burlington, MA 01803-4100 Tel 781-229-8900 Ext. 34 Fax 781-229-8624 --------------------- http://www.ansoft.com --------------------- -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Nancy Wei Sent: Thursday, July 25, 2002 1:04 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] HSPICE error SI-list, I am using Star-HSPICE to simulate a very simple circuit, but I got an error message "no dc path to ground from node 0:3 ". Can HPICE simulate this kind of circuit? How can I fix the error? Thanks. -----------------circuit script ------------------ .option post = 2 .ac lin 100 1e6hz 5ghz vs 1 0 ac 1 rs 2 1 50 c1 3 2 1e-12 c2 3 0 2e-12 .print ac vm(3) .end --------------------------------------------------- **error**: no dc path to ground from node 0:3 Nancy _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com ------------------------------------------------------------------ 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 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 ------------------------------------------------------------------ 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 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