FreeLists / si-list / [SI-LIST] Skin effect in ADS

[Matthew Herndon <mherndon@xxxxxxxxx>]

Hi -

I am a relatively new user of ADS (most of my background is with 
various flavors of SPICE). I really like the ADS; however, I've run 
into a limitation that, if I understand things correctly, would 
severely limit its usefulness to me: apparently, none of the 
transmission line models in ADS model skin effect.

I discussed the situation with ADS support; they confirmed that skin 
effect is not modeled in the transmission lines in their "Distributed 
Components" library (the one we looked at in detail was the MACLIN 
model of asymmetric coupled microstrip lines). The only workarounds 
they suggested involved using the "multilayer library" or using 
momentum, both of which are field-solver based (therefore I would 
expect them to be very slow, a major drawback). They both also require 
an additional license (a minor drawback).

Has anyone else run into this problem? Is it as serious a limitation as 
it appears to me?

Along with the fact that a number of other simulators now support 
time-domain simulation of s-parameter blocks, I now feel quite a lot 
less incentive to use ADS. Or am I overlooking something?

-matt
Matt Herndon, PhD.
Signal Integrity Group
Apple Computer
Cupertino, CA

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