[SI-LIST] Re: TDR in HSPICE from S parameter Touchstone File

Hi Mani,

This differential TDR netlist worked fine for me. I don't see any
problems...

Best regards,
Steve

Stephen P. Zinck
High-Speed Signal Integrity Consulting
Interconnect Engineering Inc.
P.O. Box 577
South Berwick, ME 03908
Phone - (207) 384-8280
Email - szinck@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Web - www.interconnectengineering.com

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Mani Ganesan
Sent: Thursday, August 05, 2010 07:04 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] TDR in HSPICE from S parameter Touchstone File

Hi All
I have a small problem in doing TDR in HSPICE. I simulated my high speed
trace in HFSS and got the s parameter touchstone file from DC to 20GHz
incrementing at 10MHz.

I am trying to do TDR anlysis in HSPICE and would like to plot it.

Can anyone confirm my following netlist and please let me know my mistakes
as the impdeance TDR output is not correct? Please see the attached TDR
output.

Please let me know where I am going wrong.

.opt post probe runlvl=5
.tran 0.005n 8n
S1 inp inn outp outn 0 mname=s_model
.model s_model S N=4 TSTONEFILE="touchstone_name.s4p"
+ fbase=1e7
+ fmax=20e9

.param vinput = 1.0
.param zref = 50.0

P1 inp_ inn_ 0 zo=zref port=1 pulse(0v vinput 1ns 0.01ns 0.01ns)

TdrP inp_ 0 inp 0 Zo=zref td=1n
TdrN inn_ 0 inn 0 Zo=zref td=1n

P2 outp outn 0 zo=zref port=2

Pref refp refn 0 zo=zref port=3 pulse(0v vinput 1ns 0.01ns 0.01ns)
PrefT refp refn 0 zo=zref port=4

.probe tran V(inp) V(inn) V(outp) V(outn)
.probe tran vincident = par('v(refp)-v(refn)')
.probe tran vdiff = par('v(inp_)-v(inn_)')
.probe tran vreflect = par('vdiff-vincident')
.probe tran TDRdiff = par('2*zref*(vincident + vreflect)/(vincident -
vreflect)')

.end

Thank You
Mani



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