Lossy transmission line

Instance line: Oname …
Model line: .model mname ltra
Terminals: P1+, P1-, P2+, P2-
Described in: Transmission lines
Source: src/lib/dev/ltra/ltra.c

Instance parameters (9)

Input and output (4)

name	type	description	notes
`v1`	real	Initial voltage at end 1	ac; listed by show only when all parameters are asked for
`v2`	real	Initial voltage at end 2	ac; listed by show only when all parameters are asked for
`i1`	real	Initial current at end 1	ac; listed by show only when all parameters are asked for
`i2`	real	Initial current at end 2	ac; listed by show only when all parameters are asked for

Input only (1)

name	type	description	notes
`ic`	real vector	Initial condition vector:v1,i1,v2,i2

Output only (4)

name	type	description	notes
`pos_node1`	integer	Positive node of end 1 of t-line	listed by show only when all parameters are asked for
`neg_node1`	integer	Negative node of end 1 of t.line	listed by show only when all parameters are asked for
`pos_node2`	integer	Positive node of end 2 of t-line	listed by show only when all parameters are asked for
`neg_node2`	integer	Negative node of end 2 of t-line	listed by show only when all parameters are asked for

Model parameters (27)

Input and output (25)

name	type	description	notes
`ltra`	flag	LTRA model
`r`	real	Resistance per metre	listed by show only when all parameters are asked for
`l`	real	Inductance per metre	ac; listed by show only when all parameters are asked for
`g`	real	Conductance per metre
`c`	real	Capacitance per metre	ac; listed by show only when all parameters are asked for
`len`	real	length of line	listed by show only when all parameters are asked for
`nocontrol`	flag	No timestep control	listed by show only when all parameters are asked for
`steplimit`	flag	always limit timestep to 0.8*(delay of line)	listed by show only when all parameters are asked for
`nosteplimit`	flag	don't always limit timestep to 0.8*(delay of line)	listed by show only when all parameters are asked for
`lininterp`	flag	use linear interpolation	listed by show only when all parameters are asked for
`quadinterp`	flag	use quadratic interpolation	listed by show only when all parameters are asked for
`mixedinterp`	flag	use linear interpolation if quadratic results look unacceptable	listed by show only when all parameters are asked for
`truncnr`	flag	use N-R iterations for step calculation in LTRAtrunc	listed by show only when all parameters are asked for
`truncdontcut`	flag	don't limit timestep to keep impulse response calculation errors low	listed by show only when all parameters are asked for
`compactrel`	real	special reltol for straight line checking	ac; listed by show only when all parameters are asked for
`compactabs`	real	special abstol for straight line checking	ac; listed by show only when all parameters are asked for
`f`	real	Frequency
`nl`	real	Normalized length at frequency given
`fullcontrol`	flag	rigorous timestep control
`halfcontrol`	flag	only the current step is considered for timestep control
`print`	flag	printing of debugging info on
`noprint`	flag	printing of debugging info off
`ronly`	flag	use special load routines for G=0
`choprel`	real	special reltol for truncation of impulse responses
`chopabs`	real	special abstol for truncation of impulse responses

Output only (2)

name	type	description	notes
`rel`	real	Rel. rate of change of deriv. for bkpt
`abs`	real	Abs. rate of change of deriv. for bkpt

Parameters are set on the instance or .model line as keyword=value, and read back with @name[keyword] or the show and showmod commands. See the device reference.