[SI-LIST] Re: Hspice Fieldsolver Question
- From: "Tracy Barclay" <Tracy.Barclay@xxxxxxxxxxxx>
- To: <bowen.liu@xxxxxxxxx>
- Date: Tue, 25 Nov 2003 11:15:19 -0800
Hi Bowen,
What version of HSPICE are you using? Is it possible to send me your
netlist as an attachment? There's a bunch of special characters that came
through in the email.
You can use 'mil' or 'mm' in your field solver dimensions so that you don't
have to write the dimensions as expressions to convert them from meters
(default).
Tracy Barclay
CAE
Synopsys, Inc.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Liu, Bowen
Sent: Monday, November 24, 2003 15:48
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Hspice Fieldsolver Question
Hi,
I got an error "Singular MOM Matrix" when running Hspice fieldsolver,
the source code is at below.
I found that if I change trace width(W_MB) from 6 to 4 mils, it would
work.
Looking for inputs on causes for this error and work around.
Thanks a lot,
Bowen
.tran 0.01n 20n
V1 1 0 10 AC 1 PULSE 0 5 10N 20N 20N 500N 2U
R1 1 2 1K
R2 2 0 1K
C1 2 0 .001U
.option post=3D1
.option probe
.param MB_U_GRID=3D10
.param Er_MB=3D5
.param Er_MB_SM=3D3
.param H_MB=3D2
.param W_MB=3D6
.param T_MB=3D1
.param T_Er_MB=3D0.25
.param T_PLANE=3D1.2
**********
*Materials
**********
.material diel_MB Dielectric ER=3DEr_MB Losstangent=3D0.027
.material diel_MB_SM Dielectric ER=3DEr_MB_SM Losstangent=3D0.027
.material trace METAL CONDUCTIVITY=3D31meg
.material gnd_plane METAL CONDUCTIVITY=3D31meg
**********
*SHAPE
**********
.shape rect_TL0 Rectangle Width=3D'W_MB*0.0254e-3' =
Height=3D'T_MB*0.0254e-3'
***********
*STACKUP
***********
.Layerstack stack_TL0
+Layer=3D(gnd_plane,'0.0254e-3*T_PLANE')
+Layer=3D(diel_MB,'0.0254e-3*H_MB')
+Layer=3D(diel_MB_SM,'0.0254e-3*T_Er_MB')
******************
*option settings
******************
.fsoptions opt1 accuracy=3Dhigh printdata=3Dyes
+COMPUTEGD=3DYES, COMPUTERS=3DYES
*****************
*conductors
*****************
.MODEL U_MB W Modeltype=3DFieldSolver,
+LayerStack=3D stack_TL0, Fsoptions=3Dopt1,
+RLGCFILE=3Dtest.rlc
+conductor=3D(shape=3Drect_TL0,MATERIAL=3DTRACE,
TYPE=3DSIGNAL,Origin=3D(0,'0.0254e-3*(T_PLANE+H_MB)')),
+conductor=3D(shape=3Drect_TL0,MATERIAL=3DTRACE,
TYPE=3DSIGNAL,Origin=3D('0.0254e-3*MB_U_GRID','0.0254e-3*(T_PLANE+H_MB)')=
),
+conductor=3D(shape=3Drect_TL0,MATERIAL=3DTRACE,
TYPE=3DSIGNAL,Origin=3D('2*0.0254e-3*MB_U_GRID','0.0254e-3*(T_PLANE+H_MB)=
'))
.end
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