[SI-LIST] Re: varying the overlap length between two parallel conductors
- From: "Keskinen, Kai" <KKeskinen@xxxxxxxxxxxx>
- To: "'cshaheen@xxxxxxxxxxx'" <cshaheen@xxxxxxxxxxx>,si-list@xxxxxxxxxxxxx
- Date: Mon, 15 Jul 2002 14:14:59 -0400
It appears what you are trying to model is two tracks that are uncoupled for
a certain length and then coupled for a certain length and then again
uncoupled for a certain length. To do this correctly, you use a single line
(N=1) in the unoverlapped region, a coupled line in the overlapped region
(N=2) and a single line again (N=1).
Hope this helps.
Kai Keskinen
Signal Integrity Advisor
Solectron Technical Center
425 Legget Drive,
Kanata, ON K2K 2W2
kkeskinen@xxxxxxxxxxxx
www.solectron.com
> "This message may contain information proprietary to Solectron so any
unauthorized disclosure, copying or distribution of its contents is strictly
prohibited."
-----Original Message-----
From: Mohamed Shaheen [mailto:cshaheen@xxxxxxxxxxx]
Sent: Monday, July 15, 2002 1:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] varying the overlap length between two parallel
conductors
Hi,
I appreciate any hint to help me.
I am trying to model 2 parallel wires and the general case is:
1 o-------------------------o
2 o-------------------------------o
with different length for every conductor
As a test, I am attaching 2 spice files one which model one w-element with 2
conductors and the second one models 2 w-element with one conductor each.
both cases should map to 2 parallel conductors of the same length
1 o---------------------------------o
2 o---------------------------------o
The 2 conductors in both files has the same every thing (length, origin,
...)
However, I do not get the same simulation results!!!
Thanks,
Shaheen
first spice file -- dual conductor transmission line
----------------
.OPTION scale=1.0u
.OPTION POST
V1 in0 GND pwl 5n 0v 5.06n sp $, 14.94n sp, 15.0n 0v
V2 in1 GND pwl 5n 0v
W1 in0 in1 GND out0 out1 GND FSmodel=mymodel1 N=2 l=500u
C1 out0 GND 10fF
C2 out1 GND 10fF
.PARAM sp=3.3v
.MODEL mymodel1 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test3.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(0u, 3000u), MATERIAL=mymetal) CONDUCTOR=( SHAPE=myshape,
+ORIGIN=(150u, 3000u), MATERIAL=mymetal)
.MATERIAL mymetal METAL CONDUCTIVITY=57.6meg
.MATERIAL mydiel DIELECTRIC LOSSTANGENT=1.2e-3
.SHAPE myshape RECTANGLE WIDTH=50u HEIGHT=10u NW=30 NH=10
.LAYERSTACK mystack BACKGROUND=AIR LAYER=(PEC, 10) LAYER=(mydiel, 299u)
.FSOPTIONS myoption ACCURACY=HIGH GRIDFACTOR=1 PRINTDATA=YES COMPUTEGD=YES
+ COMPUTERS=YES
.TRAN 0.01n 20n
.end
second spice file -- one conductor 2 transmission lines
----------------
.OPTION scale=1.0u
.OPTION POST
V1 in0 GND pwl 5n 0v 5.06n sp $, 14.94n sp, 15.0n 0v
V2 in1 GND pwl 5n 0v
W1 in0 GND out0 GND FSmodel=mymodel1 N=1 l=500u
W2 in1 GND out1 GND FSmodel=mymodel2 N=1 l=500u
C1 out0 GND 10fF
C2 out1 GND 10fF
.PARAM sp=3.3v
.MODEL mymodel1 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test22_1.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(0u, 3000u), MATERIAL=mymetal)
.MODEL mymodel2 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test22_2.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(150u, 3000u), MATERIAL=mymetal)
.MATERIAL mymetal METAL CONDUCTIVITY=57.6meg
.MATERIAL mydiel DIELECTRIC LOSSTANGENT=1.2e-3
.SHAPE myshape RECTANGLE WIDTH=50u HEIGHT=10u NW=30 NH=10
.LAYERSTACK mystack BACKGROUND=AIR LAYER=(PEC, 10) LAYER=(mydiel, 299u)
.FSOPTIONS myoption ACCURACY=HIGH GRIDFACTOR=1 PRINTDATA=YES COMPUTEGD=YES
+ COMPUTERS=YES
.TRAN 0.01n 20n
.end
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