[SI-LIST] TDR in HSPICE from S parameter Touchstone File
- From: Mani Ganesan <signal.integrity2@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 5 Aug 2010 16:04:21 -0700
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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