hello everyone: The question is How to get TDR based on S parameter. One easy way, ADS can bulit up a transient response simulation with S parameter block. The other way is to use IFFT, but if I do IFFT with S11, the result is impulse response or step response. I know if I do IFFT with S21, I can get impluse response. Dose anyone have the code to convert S11 to TDR? I want to study it, and thanks a lot for help. Good luck to all. fangod 2011-10-25 ------------------------------------------------------------------ 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 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu