Hi ChrisDG, You didn't mention 1) what you are trying to do. Are you modeling transmission lines? 2) what tool you are using. Layout? Transmissionline library? mtline? 3) and the version of that tool. IC617? Spectre16.1? 4) what documentation/manual (the name and version). So, it's pretty hard to know what you are trying to do. best regards, Tawna
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