[SI-LIST] : HSPICE W-element and skin effect

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From: Sunil Kumar (sunilb@cdotb.ernet.in)
Date: Sat Sep 09 2000 - 07:14:44 PDT


Hello everybody.

I am simulating a gigabit (1.25Gbps) link in HSPICE 2000.2 by modeling a
transmission line with W-element. I am using 18mil coupled
(differential) microstrip. According to the manual, the skin effect is
calculated by using RISETIME option. I have used different
values for RISETIME e.g. 50ps, 100ps, 600ps, but I am not seeing any
difference in the eye diagram. Can anybody explain this? Where am I making
a mistake? How exactly does HSPICE calculate the skin effect for
W-element?

In case of U-element, skin resistance is calculated for
f=1/(15*risetime), and this value is added to the dc resistance to get the
effective resistance. The resulting equivalent resistance depends on one
frequency; it does not depend on various frequency components in the
edge. I beleive this not is not an accurate model for simulating lossy
lines. In the W-element it is not mentioned how it calculates skin effect
resistance. Any comments?

Thanks in advance for any help.

Sunil Kumar Ph: 91-80-2204616
Research Engineer Fax: 91-80-2263256
ATM Group Email: sunilb@cdotb.ernet.in
Switching BII
C-DOT
Sneha Complex
71/1 Millers Road
Bangalore-560052
Karnataka
INDIA

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