try this. cdc 1 2 my_dccap gsw 1 2 i='if (time <= 0) (1e3 * v(1,2)) else 0' Patrick_Carrier@xxxxxxxx wrote: I agree with Lou. I know in Spice you can get around that anomaly by specifying an initial charge condition on the cap. I don't think there is a way to do that in Specctraquest though, so you need to just wait several cycles to look at the waveform. --Pat -----Original Message----- From: Sanchez, Louis [mailto:louis.sanchez@xxxxxxxxx] Sent: Wednesday, March 13, 2002 10:55 AM To: 'hassan@xxxxxxxx'; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: SPECCTRAQuest: DC level shift with series caps Hello Hassan............ It will take several pulses before you see the expected results in an AC coupled network. I believe that you are dealing with the initial condition of time it takes for all storage elements (capacitors) to reach equilibrium. I suggest that you lengthen the period of your analysis in the Preferences section of SigXplorer. Lou A. Sanchez -----Original Message----- From: Hassan O. Ali [mailto:hassan@xxxxxxxx] Sent: Wednesday, March 13, 2002 6:49 AM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] SPECCTRAQuest: DC level shift with series caps Hi All, I'm trying to use SigXplorer to simulate a link with a differential driver and series DC-blocking caps. Contrary to expectations, single-ended P and N outputs measured at the load are not centered around 0V DC, instead each one is given a separate DC shift. When I remove the series caps, the output is as expected - centered around 0V DC. Does anybody know what I can do to have the correct single-ended outputs with the series caps? Thanks. Hassan. ------------------------------------------------------------------ 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 ------------------------------------------------------------------ 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 --------------------------------- Do You Yahoo!? Try FREE Yahoo! Mail - the world's greatest free email! ------------------------------------------------------------------ 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