[SI-LIST] Re: ADS Momentum simulation of a differential transmission line
- From: Istvan Novak - Board Design Technology <Istvan.Novak@xxxxxxx>
- To: Chen Jikai <yfgchen@xxxxxxxxxxxx>
- Date: Mon, 27 Jul 2009 15:32:30 -0400
How long piece did you simulate? If there is mismatch on the line and
the line is a fraction of wavelength long at the highest frequency, you
wont see the characteristic mismatch ripple, only the weird uptick in s21.
Regards,
Istvan Novak
SUN Microsystems
On 07/27/09 14:43, Chen Jikai wrote:
> 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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