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Nexxim Simulator >
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Transmission Lines >
W-Model Transmission Line, FIELDSOLVER

W-Model Transmission Line, FIELDSOLVER

W Fieldsolver Model Netlist Syntax

The netlist format for a W-model transmission line with FIELDSOLVER model type is:

.MODEL modelname W MODELTYPE=FIELDSOLVER

RLGCFILE=filename

ACCURACY=low|medium|high

FDIE=freq

LAYERSTACK=stackname

CONDUCTOR=(

SHAPE=shapename

[MATERIAL=materialname]

[ORIGIN=(x,y)]

[TYPE=SIGNAL|REFERENCE]

)

[CONDUCTOR=(

SHAPE=shapename

[MATERIAL=materialname]

[ORIGIN=(x,y)]

[TYPE=SIGNAL|REFERENCE]

)]...

**W FIELDSOLVER Model Parameters**
Model Parameter	Description	Unit	Default
LAYERSTACK	Name of layer stack defined in .LAYERSTACK statement	None	Required
CONDUCTOR	Subfields specify the parameters of a conductor. The .MODEL statement can include one or more CONDUCTOR definitions. CONDUCTOR entries must be the last entries in the .MODEL statement	None	One CONDUCTOR definition is required
SHAPE	Name of shape defined in .SHAPE statement	None	Required
MATERIAL	Name of material defined in .MATERIAL statement	None	See description of .MATERIAL statement for default
ORIGIN	In Cartesian coordinates, the (X,Y) location of the origin of the conductor The X coordinate can be positive, negative, or zero. The Y coordinate must be positive or zero.	Meter	0.0, 0.0
TYPE	Conductor type SIGNAL = signal node REFERENCE = use as reference node in W element	None	SIGNAL
RLGCFILE	Name of the file of RLGC values saved for a particular setup. If the file exists, new values are appended.	None	None
ACCURACY	Discretization level for the geometry: low, medium, or high	None	medium
FDIE	Frequency at which dielectric data are specified	Hz	-1e30

Example FIELDSOLVER Model Statement

.MODEL fs_test W MODELTYPE=FIELDSOLVER
+ LAYERSTACK=stack_2
+ RLGCFILE=example4.rlgc
+ ACCURACY=low
+ CONDUCTOR=(SHAPE=rect1, ORIGIN=(-0.6mm, 0.8mm), MATERIAL=copper)
+ CONDUCTOR=(SHAPE=poly_1, ORIGIN=(-0.5mm, 0.2mm), MATERIAL=copper)
+ CONDUCTOR=(SHAPE=strip_1, ORIGIN=(0.1mm, 0.2mm), MATERIAL=copper)
+ CONDUCTOR=(SHAPE=circ_1, ORIGIN=(0.2mm, 0.7mm), MATERIAL=copper)

FIELDSOLVER Model Notes

1. FIELDSOLVER models in externally-generated netlists may contain FSOPTIONS, RLGCFILE, COORD, or OUTPUTFORMAT parameters. These parameters are ignored by this version of Nexxim.

2. The Nexxim fieldsolver uses Cartesian coordinates only. Polar coordinates are not supported.

3. The Nexxim fieldsolver supports conductors of type SIGNAL and REFERENCE. The presence of any conductors of type FLOATING in an externally-generated netlist will cause simulation to fail.

.MATERIAL Statement

The .MATERIAL statement defines the parameters for a single material type. The syntax is:

.MATERIAL materialname METAL|DIELECTRIC

[ER=val]

[CONDUCTIVITY=val]

[LOSSTANGENT=val]

The material must be defined to be either METAL or DIELECTRIC.

**MATERIAL Statement Entries**
Entry	Description	Unit	Default
ER	Dielectric constant (relative permittivity)	None	METAL: 1 DIELECTRIC: 1
CONDUCTIVITY	Static field conductivity	Siemens/Meter	METAL: -1 DIELECTRIC: 0
LOSSTANGENT	AC field loss tangent of dielectric	None	DIELECTRIC: 0

Example .MATERIAL Statements

.MATERIAL copper METAL CONDUCTIVITY=57.6meg
.MATERIAL diel_1 DIELECTRIC ER=9.64 LOSSTANGENT=0.00064
.MATERIAL diel_2 DIELECTRIC ER=4.95 LOSSTANGENT=0.00086
.MATERIAL diel_3 DIELECTRIC ER=7.80 LOSSTANGENT=0.00024

MATERIAL Statement Notes

1. PEC is a system-defined METAL material with the default values for METAL materials.

2. AIR is a system-defined DIELECTRIC material with the default values for DIELECTRIC materials.

3. The parameter values for these system-defined material names cannot be changed.

.LAYERSTACK Statement

The .LAYERSTACK statement specifies the sequence of dielectric and metal layers in the object to be analyzed. The syntax is:

.LAYERSTACK stackname
[LAYER=(materialname, thickness)
[, LAYER=(materialname, thickness)]...]

**LAYERSTACK Statement Entries**
Entry	Description	Unit	Default
LAYER	materialname = material name defined in .MATERIAL statement. thickness = thickness of layer. Layers are specified starting with the lowest layer. The bottom of the layer stack is at Y=0.0. METAL materials can be the bottom layer, the top layer, or both. Inner layers must be DIELECTRIC.	Thickness: Meter	If no LAYER entry is present, stackup represents a free space without a ground plane. If a LAYER entry is present, the materialname and thickness are both required.

Note

Nexxim automatically supplies a layer of AIR above the topmost layer specified in the .LAYERSTACK statement. BACKGROUND entries in externally-generated netlists are ignored by Nexxim.

Example .LAYERSTACK Statement

.LAYERSTACK stack_1
+ LAYER=(copper, 0.0) // Lowest layer
+ LAYER=(diel_1, 0.2mm)
+ LAYER=(diel_2, 0.5mm)
+ LAYER=(diel_3, 0.3mm)
+ LAYER=(copper, 0.0) // Topmost layer

.SHAPE Statement

The .SHAPE statement specifies the cross-sectional shape of a conductor. Rectangle, circle, polygon, and strip shapes are supported in Nexxim.

Note

Externally-generated netlists may include the NH and NW parameters. These parameters are ignored by the Nexxim fieldsolver. The equivalent controls are generated and adjusted internally and do not require user input.

.SHAPE shapename RECTANGLE WIDTH=val HEIGHT=val

The origin for a rectangular conductor is at the lower left corner.

**Rectangular SHAPE Statement Entries**
Entry	Description	Unit	Default
WIDTH	Width of conductor cross-section	Meter	Required
HEIGHT	Height of conductor cross-section	Meter	Required

.SHAPE shapename CIRCLE RADIUS=val

The origin for a circular conductor is the center of the circle.

**Circular SHAPE Statement Entries**
Entry	Description	Unit	Default
RADIUS	Radius of conductor cross-section	Meter	Required

.SHAPE shapename POLYGON VERTEX=[x1, y1, x2, y2, ...]

The origin for a polygonal conductor can be any vertex; x1, y1 is recommended.

**Polygon SHAPE Statement Entries**
Entry	Description	Unit	Default
VERTEX	x and y coordinates of all vertices of the polygon. The vertices may be specified in clockwise or in counterclockwise sequence	Meter	Required

.SHAPE shapename STRIP WIDTH=val

The origin for a 2D strip conductor is the left edge.

**Strip SHAPE Statement Entries**
Entry	Description	Unit	Default
Width	Width of conductor	Meter	Required

Example SHAPE Statements

.SHAPE rect_1 RECTANGLE HEIGHT=0.01mm WIDTH=0.4mm
.SHAPE circ_1 CIRCLE RADIUS=0.1mm
.SHAPE poly_1 POLYGON VERTEX=[-0.5,0.2,-0.3,0.4,-0.1,0.2]
.SHAPE strip_1 STRIP WIDTH=0.4mm

Netlist Example of W FIELDSOLVER Transmission Line

Here is an example of a W FIELDSOLVER transmission line that includes all of the statement types described in this topic.

* W FIELDSOLVER TRANSMISSION LINE EXAMPLE

W1 Port1 Port2 0 Port3 Port4 0 N=2 L=10e-3 FSMODEL=fs_test

.SHAPE rect_1 RECTANGLE HEIGHT=0.1mm WIDTH=0.4mm
.SHAPE circ_1 CIRCLE RADIUS=0.1mm
.SHAPE poly_1 POLYGON VERTEX=[-0.5,0.2,-0.3,0.4,-0.1,0.2]
.SHAPE strip_1 STRIP WIDTH=0.4mm

.LAYERSTACK stack_1
+ LAYER=(copper, 0.0) // Lowest layer
+ LAYER=(diel_1, 0.2mm)
+ LAYER=(diel_2, 0.5mm)
+ LAYER=(diel_3, 0.3mm)
+ LAYER=(copper, 0.0) // Topmost layer

The transmission line described by this netlist can be diagrammed as:

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