[SI-LIST] Re: varying the overlap length between two parallel con ductors
- From: "Mohamed Shaheen" <cshaheen@xxxxxxxxxxx>
- To: KKeskinen@xxxxxxxxxxxx
- Date: Mon, 15 Jul 2002 19:04:19 +0000
Hi,
Thanks for your time. I understand from your email that thers is no way that
the 2 SPICE files generate the same simulation results.
I am attaching the HSPICE file which has 3 w elements, but I have the proble
to specify the origin (X is the spacing between conductors direction, Y is
the height direction). The length is in the Z direction.
How can I put the second and third W elements along the first W element.
I mean what should be their origins.
Thanks
spice file -- 3 W elements 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 GND out00 GND FSmodel=mymodel1 N=1 l=250u
W2 out00 in1 GND out0 out11 GND FSmodel=mymodel2 N=2 l=500u
W2 out11 GND out1 GND FSmodel=mymodel3 N=1 l=300u
C1 out0 GND 10fF
C2 out1 GND 10fF
.PARAM sp=3.3v
.MODEL mymodel1 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test1.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(0u, 3000u), MATERIAL=mymetal)
.MODEL mymodel2 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test2.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(0u, 3000u), MATERIAL=mymetal) CONDUCTOR=( SHAPE=myshape,
+ORIGIN=(150u, 3000u), MATERIAL=mymetal)
.MODEL mymodel3 W MODELTYPE=FieldSolver LAYERSTACK=mystack
FSOPTIONS=myoption
+ RLGCFILE=test3.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape,
+ ORIGIN=(0u, 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
>From: "Keskinen, Kai" <KKeskinen@xxxxxxxxxxxx>
>Reply-To: KKeskinen@xxxxxxxxxxxx
>To: "'cshaheen@xxxxxxxxxxx'" <cshaheen@xxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: varying the overlap length between two parallel con
>ductors
>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:
> in1 out11 out1
> 1 o-------------------------o
in0 out00 out0
> 0 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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