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Nexxim Simulator >
Nexxim Component Models >
Offset Stripline Elements >
Multi-Coupled Lines, Differential Pairs, Field Solver

Multi-Coupled Lines, Differential Pairs, Field Solver

A multicoupled line, two differential pairs, field solver instance has the following netlist syntax:

Wxxx n1 n2 n3 n4 0 n5 n6 n7 n8 0 N=4 [L=length] FSmodel=modelname

.MATERIAL conductor METAL CONDUCTIVITY=conductivity
.MATERIAL dielectric DIELECTRIC ER=er LOSSTANGENT=losstangent
.SHAPE RECT1 RECTANGLE WIDTH=w HEIGHT=t1 // Conductors
.LAYERSTACK offsetstripline
+ LAYER=(cond1, t2) // Ground plane
+ LAYER=(dielectric, B)
+ LAYER=(cond1, t2)
.MODEL modelname W MODELTYPE=Fieldsolver
+ LAYERSTACK=offsetstripline
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0, 't2 + BL')
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=('w+gap', 't2 + BL'
+ MATERIAL=conductor, TYPE=REFERENCE)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=('2w+gap', 't2 + BL')
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('3w+2gap+sep', 't2 + BL')
+ MATERIAL=conductor, TYPE=REFERENCE)

n1, n2, n3, and n4 are the names of the input nodes. n5, n6, n7, and n8 are the corresponding output nodes. The entry N=4 shows that this is a 4-conductor, 2-pair differential line.

The entry FSmodel=modelname identifies the field solver microstrip model.

**Multicoupled Line, Differential Pairs, Field Solver**
**Instance Parameters**
Parameter	Description	Units	Default
L	Physical length	Meter	1e-3
N	Number of lines	None	None
BL	Hieght of signal conductors above lower ground plane	Meter	B/2
conductor	Conductor material	None	cond1
conductivity	Conductivity of conductor material		57.6e6
dielectric	Dielectric material	None	diel1
B	Thickness of dielectric layer	Meter	1e-3
er	Dielectric constant		2.2
losstangent	Dielectric loss tangent		0
w	Width of conductor	Meter	1e-3
gap	Gap width between differential lines	Meter	1e-3
sep	Separation between pairs of lines	Meter	5e-3
T1	Thickness of conductors	Meter	0.001
T2	Thickness of ground planes	Meter	0.001

Note

The default values for the differential coupled lines are the ones assigned when placing a component from the Ansoft Component library in a schematic. There are NO defaults for netlist designs; all values must be specified.

Netlist Example

W3 Port1 Port2 0 net_1911 net_2 0 N=2 L=0.002 FSmodel=BCL1

.MATERIAL copper METAL CONDUCTIVITY=5.8e7
.MATERIAL dielectric DIELECTRIC ER=4.4 LOSSTANGENT=0.02
.SHAPE RECT1 RECTANGLE WIDTH=.002 HEIGHT=.001 // Conductors
.LAYERSTACK STACK1
+ LAYER=(PEC, .003) // Bottom ground
+ LAYER=(dielectric, .01)
+ LAYER=(AIR, .03)
.MODEL MSFS1 W MODELTYPE=Fieldsolver
+ LAYERSTACK=STACK1
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0, '.003+.01')
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=('.002+.004', '.003+.01')
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=('2*.002+.004', '.003+.01')
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=('3*.002+2*.004', '.001+.01')
+ MATERIAL=conductor, TYPE=SIGNAL)

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