[SI-LIST] Re: ADS Momentum simulation of a differential transmission line
- From: "Aubrey Sparkman" <asparkman@xxxxxxxxxxxxx>
- To: "'Chen Jikai'" <yfgchen@xxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 27 Jul 2009 14:19:56 -0500
Chen,
If you are speaking about S21 instead of SDD21, that is expected behavior
due to the resonance between the two traces. Does S41 have a peak at about
the same frequency? Add a solder mask layer and you can bring down and
control the frequency of the dip point.
Try converting to Sdd21 and look at that for your expected behavior.
Aubrey Sparkman
Aubrey.K.Sparkman@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Chen Jikai
Sent: Monday, July 27, 2009 1:44 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ADS Momentum simulation of a differential transmission
line
Hi all,
We have been simulating a differential microstrip using ADS Momentum. One
weird thing we observed is that the loss is not monotonic. S21 rolls off as
expected from DC to around 30G. However, from 30G, it increases until about
60G. Since it's just a simple transmission line, involving no
discontinuities, shouldn't S21 be monotonic? Does anyone know what could be
causing this problem?
Thanks a million in advance.
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