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Determining risetime degration of 2X Thru microstrip trace

Question asked by cmwong on Aug 11, 2009
Hi, I have come across some papers that in order to determine risetime degradation of a 2X Thru microstrip trace, one could first measure its insertion loss S21. After which, determine its banwidth at -6dB from the insertion loss plot. Why is this so? Please help to clear my doubts. Thanks very much!