An Application Example of W-element & Hyperlynx
[ELEC_ENG_5620] W-element Examplesusing Hyperlynx and
HSPICE1IntroductionsExtracting transmission line W-element from
HyperLinxSimulation using the W-element at HSPICETime-domain
simulation (Transient)Frequency-domain simulation (AC)
ContentsThis document gives an example to illustrate how to use
HSPICE W-element to model a stripline trace and differential
traces.ObjectiveThe W-element is a versatile transmission line
model that you can apply to efficiently and accurately simulate
transmission lines, ranging from a simple lossless line to complex
frequency-dependent lossy-coupled lines.Whats W-element?
This specification is what we usually use.Example of W-element
syntax (HSPICE)Example: For N signal conductor, W-element
transmission line in RLGC model form is like the following.
W_test1 in1 in2 inN iR out1 out2 outN oR RLGCMODEL=name N=val
L=val
in1in2iRout1out2oRW_test1in3out3LRLGC
modelrefrefinNoutNExtracting transmission line W-element from
HyperLinx: Coupled Strip Line
Example Geometry254umA lossy 0.254 meter stripline is used as an
example.Cross sectionstackupr=4.5;tan=0.02;All the metals are
copper.
254um254umStep 1
Open up Hyperlynx.click this.Step 2 - aDefine geometry in
Hyperlynx.
2.Right click on it.3.left click this.1.Select a cell
Step 2 - bDefine stack-up in Hyperlynx.1.left click here.
2.Delete unwanted layers and define trace dimensions. Then
define material property under Dielectric tab.
Step 2-cEdit the first trace.
Make sure trace width is as you want to.
Step 2-dAdd another trace
3. Coupled line should be look like:4. Remember to change 2nd
line geometry and trace-trace separation.
2. Follow this to add the 2nd line. 1. After adding another
line, click this
Step 3Do field simulation and check numerical resultsSee your
results here.
Step 4 - aExport RLGC parameters from Hyperlynx
1.left click here to add source.2. Click Select.3. Select TDR as
source
4. Click Output.Step 4 - bExport RLGC parameters from
Hyperlynx
1.Click this.
2. Save netlistStep 4 - cCheck the model by open rlgc.sp using
textpadThis is the model of your transmission line.
Tips on using HyperlynxMake sure lossy simulation is enabled
before simulation.
Simulation using thew-element at HSPICE: Transient
SimulationStep 1.TITLE Transient Simulation Example.option
post=2
**** Transmission line models ***********************WCond_000
in01 in02 0 out01 out02 0 RLGCmodel=Cond_000 N=2 L=0.076200
.MODEL Cond_000 W MODELTYPE=RLGC N=2* Lo (H/m)+ Lo =+
3.52271e-007 + 4.28221e-008 3.52271e-007
* Co (F/m)+ Co =+ 1.44265e-010 + -1.75368e-011 1.44265e-010
* Ro (Ohm/m)+ Ro =+ 3.95882 + 0 3.95882
* Go (S/m)+ Go =+ 0 + 0 0
* Rs (Ohm/m-sqrt(Hz))+ Rs =+ 0.00093818 + 2.09855e-005
0.000938181
* Gd (S/m-Hz)+ Gd =+ 1.81288e-011 + -2.20375e-012 1.81288e-011
**** End Transmission line models *******************W-element
statementTransient simulator-Time step:10ps-Ending
time:70ns.Differential Trapezoidal voltage sources: 0 to 1v and 0
to -1v transition, tr/tf: 20ps, pulse width:10ns, period: 20ns *
setup terminationsR1 in1 in01 50R2 in2 in02 50R3 out1 0 100R4 out2
0 100
V1 in1 0 PULSE 0v 1v 0ps 20ps 20ps 10ns 20nsV2 in2 0 PULSE 0v
-1v 0ps 20ps 20ps 10ns 20ns
.PRINT TRAN v(in01,in02) v(in1,in2) v(out01,out02)
.tran 10p 70.00n .ENDOption setting50 resistances at source100
resistances at outputW-element RLGC model(extracted from
HyperLinx)Generate HSPICE Code and save as xxx.spStep 2Run HSPICE
simulation1. Open HSPICE
2. Select the .sp file in step13. Click Simulate
Step 3View TD simulation results by SPICE explorerSource
voltageTDRTDT1. Open SPICE Explorer2. Locate simulation directory
and click .tr0 file
Simulation using the w-element at HSPICE: AC
SimulationDifferential Ports definitionSet AC sweep from 1MHzto
10GHz with 1000 pointsIt will generate a touchstone outputStep
1.TITLE AC Simulation Example.option post=2
**** Transmission line models ***********************WCond_000
in01 in02 0 out01 out02 0 RLGCmodel=Cond_000 N=2 L=0.076200
.MODEL Cond_000 W MODELTYPE=RLGC N=2* Lo (H/m)+ Lo =+
3.52271e-007 + 4.28221e-008 3.52271e-007
* Co (F/m)+ Co =+ 1.44265e-010 + -1.75368e-011 1.44265e-010
* Ro (Ohm/m)+ Ro =+ 3.95882 + 0 3.95882
* Go (S/m)+ Go =+ 0 + 0 0
* Rs (Ohm/m-sqrt(Hz))+ Rs =+ 0.00093818 + 2.09855e-005
0.000938181
* Gd (S/m-Hz)+ Gd =+ 1.81288e-011 + -2.20375e-012 1.81288e-011
**** End Transmission line models *******************W-element
statementPlot differential s-parameter* setup portsP_1 in01 in02 0
port=1 ac=1 Z0=50P_2 out01 out02 0 port=2 Z0=50
* setup freq sweep.AC lin 1000 1e6 10e9.LIN
filename=TwinStrip_Spara format=touchstone dataformat=RI
* ********* output.PROBE AC SDD11(db) SDD21(db) .PRINT AC
SDD11(db) SDD21(db)
.ENDOption settingW-element RLGC model(extracted from
HyperLinx)Generate HSPICE Code and save as xxx.spStep 2Run HSPICE
simulation1. Open HSPICE
2. Select the .sp file in step53. Click Simulate
Step 3View simulation results1. Open SPICE Explorer2. Locate
simulation directory and click .ac0 fileSDD11SDD21
