[SI-LIST] Hspice Fieldsolver Question
- From: "Liu, Bowen" <bowen.liu@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Nov 2003 15:47:30 -0800
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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