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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> S param block at DC https://designers-guide.org/forum/YaBB.pl?num=1143501898 Message started by manyoki on Mar 27th, 2006, 3:24pm |
Title: S param block at DC Post by manyoki on Mar 27th, 2006, 3:24pm I have a cabel model for Spectre in form of an S parameter file. Interestingly, it inverts at DC but not at higher frequencies. The lowest frequency tabulated in the file is 10MHz. Another interesting behavior is that if I feed into the line a DC unbalanced pattern (average = 20mV), out comes a DC balanced one. Why? What I am after is, whether my cable amplifies the DCD from the input to the output. What am I missing here? How realistic is the shown transient response, if the DC response is clearly wrong? Zoltan |
Title: Re: S param block at DC Post by Andrew Beckett on Mar 29th, 2006, 11:56am Do you have usewindow=yes set on the nport? It's nearly always a good idea to set that (the fact that this is not the default is unfortunate, but it's too late to change it now...). I've seen this help with improving DC accuracy (I'm assuming you're using interpolation mode of spline or linear - rather than rational) Regards, Andrew. |
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