Hi all, I have found something interesting while I was doing some simulation and would like to see if there is anyone out there also see this. I have found that using different impedance for a transmission line, I can obtain different rise time at the receiver. Let say I have a simple net with a driver -> 60 ohms tline-> 35 ohm stripline(this is the part I am going to change for the experiment)-> receiver and the rise time for the driver is 0.25ns. For a 35 ohm stripline I can achieve a rise time of 0.4 ns at the output, and if we replace the 35 ohm stripline with a 85 ohm stripline I can achieve a rise time of 0.3 ns at the output. Moreover for a 15 ohm stripline I can achieve a rise time of 0.68 ns at the output. For my limited knowledge I can understand if I have a difference in impedance along the net, I am going to get different overshoot/undershoot since we have a different reflection coefficient, but I am having some probelms in understanding why we can achieve a different rise time with different impedance. Is there any kind soul out there, that can explain this phenomenon to me? thanks in advance Jason Leung ------------------------------------------------------------------ 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: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: http://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