[SI-LIST] varying the overlap length between two parallel conductors
- From: Jayanta Choudhury <jxc9551@xxxxxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 4 Jul 2002 10:01:19 -0500 (CDT)
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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