GaAs MESFET

Instance line: Zname …
Model line: .model mname nmf | pmf
Terminals: Drain, Gate, Source
Described in: MESFETs
Source: src/lib/dev/mes/mes.c

Instance parameters (24)

Input and output (3)

name	type	description	notes
`area`	real	Area factor	listed by show only when all parameters are asked for
`icvds`	real	Initial D-S voltage	ac; listed by show only when all parameters are asked for
`icvgs`	real	Initial G-S voltage	ac; listed by show only when all parameters are asked for

Output only (21)

name	type	description	notes
`off`	flag	Device initially off	listed by show only when all parameters are asked for
`dnode`	integer	Number of drain node	listed by show only when all parameters are asked for
`gnode`	integer	Number of gate node	listed by show only when all parameters are asked for
`snode`	integer	Number of source node	listed by show only when all parameters are asked for
`dprimenode`	integer	Number of internal drain node	listed by show only when all parameters are asked for
`sprimenode`	integer	Number of internal source node	listed by show only when all parameters are asked for
`vgs`	real	Gate-Source voltage
`vgd`	real	Gate-Drain voltage
`cg`	real	Gate capacitance
`cd`	real	Drain capacitance
`cgd`	real	Gate-Drain capacitance
`gm`	real	Transconductance
`gds`	real	Drain-Source conductance
`ggs`	real	Gate-Source conductance
`ggd`	real	Gate-Drain conductance
`cqgs`	real	Capacitance due to gate-source charge storage
`cqgd`	real	Capacitance due to gate-drain charge storage
`qgs`	real	Gate-Source charge storage	listed by show only when all parameters are asked for
`qgd`	real	Gate-Drain charge storage	listed by show only when all parameters are asked for
`is`	real	Source current
`p`	real	Power dissipated by the mesfet

Model parameters (21)

Input and output (14)

name	type	description	notes
`vt0` (also `vto`)	real	Pinch-off voltage
`alpha`	real	Saturation voltage parameter
`beta`	real	Transconductance parameter
`lambda`	real	Channel length modulation parm.
`b`	real	Doping tail extending parameter
`rd`	real	Drain ohmic resistance
`rs`	real	Source ohmic resistance
`cgs`	real	G-S junction capacitance	ac
`cgd`	real	G-D junction capacitance	ac
`pb`	real	Gate junction potential
`is`	real	Junction saturation current
`fc`	real	Forward bias junction fit parm.
`kf`	real	Flicker noise coefficient
`af`	real	Flicker noise exponent

Input only (2)

name	type	description	notes
`nmf`	flag	N type MESfet model
`pmf`	flag	P type MESfet model

Output only (5)

name	type	description	notes
`type`	flag	N-type or P-type MESfet model
`gd`	real	Drain conductance	listed by show only when all parameters are asked for
`gs`	real	Source conductance	listed by show only when all parameters are asked for
`depl_cap`	real	Depletion capacitance
`vcrit`	real	Critical voltage

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.