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-.TH NGMULTIDEC 1 ngpice
-.SH NAME
-ngmultidec \- make ngpice sub-circuit for coupled transmission lines
-.SH SYNOPSIS
-.B ngmultidec
-[
-.IR options ...
-]
-.SH DESCRIPTION
-.I ngmultidec
-writes an ngspice input file to standard output which describes a sub-circuit for coupled lines
-using uncoupled simple lossy lines.
-.LP
-Each generated subcircuit models a 4-conductor transmission line with
-the following parameters: length
-.IR l ,
-line capacitance
-.IR c ,
-line resistance
-.IR r ,
-line conductance
-.IR g ,
-inductive_coeff_of_coupling
-.IR k ,
-inter-line capacitance
-.IR cm ,
-length
-.IR l .
-Derived parameters are:
-.IR lm ,
-.IR ctot .
-The values of
-.IR l ,
-.IR c ,
-the model name, the number of conductors and the length of the line
-must be specified.
-.LP
-It is important to note that the model is a simplified one - the
-following assumptions are made: 1. The self-inductance l, the
-self-capacitance ctot (note: not c), the series resistance r and the
-parallel capacitance g are the same for all lines, and 2. Each line
-is coupled only to the two lines adjacent to it, with the same
-coupling parameters cm and lm.
-The first assumption implies that edge effects have to be neglected.
-The utility of these assumptions is
-that they make the sL+R and sC+G matrices symmetric, tridiagonal and
-Toeplitz, with useful consequences (see the paper referenced below).
-.LP
-It may be noted that a symmetric two-conductor line is
-represented accurately by this model.
-.LP
-Standard C language scientific (exponent) notation may be used for options' numeric values.
-.SH OPTIONS
-.TP
-.BI \-o "subcircuit_name"
-Set the subcircuit name
-.TP
-.BI \-l "line_inductance"
-Set the line inductance.
-.TP
-.BI \-c "line_capacitance"
-Set the line capacitance.
-.TP
-.BI \-r "line_resistance"
-Set the line resistance.
-.TP
-.BI \-g "line_conductance"
-Set the line conductance.
-.TP
-.BI \-k "inductive_coefficient_of_coupling"
-Set the value of the inductive coefficient of coupling, whose
-absolute value
-.I k
-must be less than 1.0.
-.TP
-.BI \-x "line-to-line-capacitance"
-Set the line-to-line capacitance.
-.TP
-.BI \-L "length"
-Set the length of the line.
-.TP
-.BI \-n "number"
-Set the number of conductors.
-.TP
-.B \-u
-Write a usage message to standard error.
-.SH EXAMPLE
-.RS
-.B ngmultidec -n4 -l9e9 -c20e-12 -r5.3 -x5e12 -k0.7 -otest -L5.4 > test.cir
-.RE
-.SH SEE ALSO
-.nf
-.IR "Efficient Transient Simulation of Lossy Interconnect" ,
-J.S. Roychowdhury and D.O. Pederson,
-Proceedings of the Design Automation Conference,
-pp. 740-745.
-1991.
-.B http://portal.acm.org/citation.cfm?doid=127601.127762
-.fi
-.sp
-.IR ngnutmeg (1),
-.IR ngproc2mod (1),
-.IR ngsconvert (1),
-.IR ngspice (1),
-.IR nghelp (1).