FreeLists / si-list / [SI-LIST] varying the overlap length between two parallel conductors

[Jayanta Choudhury <jxc9551@xxxxxxxxxxxxxxxxxx>]

Hi all,
       Can anyone suggest how to vary the overlap length of two parallel 
interconnects using Transmission lines abd 2-D FSM in spice. I have simulated 
this but I cannot vary the overlap length the file is attached.
 Thanks in advance.
 Jayanta


-- Attached file included as plaintext by Ecartis --
-- File: inv_trans2.spice
-- Desc: inv_trans2.spice

*simulation for observing behavior of dual conductor transmission line

.OPTION scale=0.1u
.OPTION POST

**a piece wise linear input waveform is used to model a step input
V1 in0 GND pwl 5n 0v 5.06n sp, 14.94n sp, 15.0n 0v
V2 in1 GND pwl 5n 0v
**V1 in1 gnd PULSE (0 5 2NS 0NS 0NS 50NS 100NS)
**V1 in1 gnd SIN (0 5 1MEG)


**W type transmission line state ment with driver side in1 and gnd and reciever 
side
** out1 and ground, Field Solver(FSmodel) model is defined below, number of 
conductors
** is N=1 length of the wire is l=500*scale(0.1um)
W1 in0 in1 GND out0 out1 GND FSmodel=mymodel1 N=2 l=500

**Output Capacitance
C1 out0 GND 10fF
C2 out1 GND 10fF

.PARAM sp=3.3v 


**Model for solving equations and calculating RLGC values and writing them in 
RLGC 
**file specified by OUTPUTFORMAT, RLGCFILE is the file name ORIGIN is the 
**co-ordinates of signal type conductor MATERIAL, which is the metal. 
**The co-ordinates are in X and Y direction Z is in the length direction.
**X is the width and spacing between conductors and Y is the height of the left 
**bottom corner of the conductor from bottom left of the ground metal PEC
.MODEL mymodel1 W MODELTYPE=FieldSolver LAYERSTACK=mystack FSOPTIONS=myoption 
+ RLGCFILE=test3.rlgc OUTPUTFORMAT=RLGCFILE CONDUCTOR=( SHAPE=myshape, 
+ ORIGIN=(0, 3000), MATERIAL=mymetal) CONDUCTOR=( SHAPE=myshape, 
+ORIGIN=(150, 3000), MATERIAL=mymetal)

**mymetal has the characteristics of copper
.MATERIAL mymetal METAL CONDUCTIVITY=57.6meg

**dielectric has the characteristic of some example dielectric from manual
.MATERIAL mydiel DIELECTRIC LOSSTANGENT=1.2e-3

**Shape is Rectangle with width 5micron, height 1micron, NW=30 is number 
**of discretization in the width and NH=10 is same for height
.SHAPE myshape RECTANGLE WIDTH=50 HEIGHT=10 NW=30 NH=10

**LAYERSTACK is the stack of dielectric or metal layers associated with 
transmission 
**line, here it is a stack of default type metal named PEC and a dielectric 
** specified by Material is used as dielectric.Thickness of PEC is 1um and 
thickness
**of dielectric is 299um and background is AIR
.LAYERSTACK mystack BACKGROUND=AIR LAYER=(PEC, 10) LAYER=(mydiel, 2990)

**Options for Field Solver model is defined GRIDFACTOR, which is multipled with 
**number of discretization specified in shape, PRINTDATA to print the datas
**COMPUTEGD to calculate the conductance matrix Gd for rotation of dipoles under
**the influence of alternating electric field, COMPUTERS computes skin effect 
**Resistance matrix Rs
.FSOPTIONS myoption ACCURACY=HIGH GRIDFACTOR=1 PRINTDATA=YES COMPUTEGD=YES 
+ COMPUTERS=YES


.TRAN 0.01n 20u
.end

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