JFET level 2 (Parker-Skellern)

Instance line: Jname …
Model line: .model mname njf | pjf, LEVEL=2
Terminals: Drain, Gate, Source
Described in: Junction field-effect transistors
Source: src/lib/dev/jfet2/jfet2.c

The Parker-Skellern (PS) JFET and MESFET model, by Anthony Parker of Macquarie University, added from his 1994 patch. It has no pole-zero or distortion analysis code, so it takes no part in .PZ or .DISTO. Parameters shown with no description (ACGAM, HFE1, HFE2, HFG1, HFG2, LFG1 and LFG2) have none in the source.

Instance parameters (28)

Input and output (6)

name	type	description	notes
`off`	flag	Device initially off	listed by show only when all parameters are asked for
`ic`	real vector	Initial VDS,VGS vector	ac; listed by show only when all parameters are asked for
`area`	real	Area factor	listed by show only when all parameters are asked for
`ic-vds`	real	Initial D-S voltage	ac; listed by show only when all parameters are asked for
`ic-vgs`	real	Initial G-S volrage	ac; listed by show only when all parameters are asked for
`temp`	real	Instance temperature	listed by show only when all parameters are asked for

Output only (22)

name	type	description	notes
`drain-node`	integer	Number of drain node	listed by show only when all parameters are asked for
`gate-node`	integer	Number of gate node	listed by show only when all parameters are asked for
`source-node`	integer	Number of source node	listed by show only when all parameters are asked for
`drain-prime-node`	integer	Internal drain node	listed by show only when all parameters are asked for
`source-prime-node`	integer	Internal source node	listed by show only when all parameters are asked for
`vgs`	real	Voltage G-S
`vgd`	real	Voltage G-D
`ig`	real	Current at gate node
`id`	real	Current at drain node
`is`	real	Source current
`igd`	real	Current G-D
`gm`	real	Transconductance
`gds`	real	Conductance D-S
`ggs`	real	Conductance G-S
`ggd`	real	Conductance G-D
`qgs`	real	Charge storage G-S junction	listed by show only when all parameters are asked for
`qgd`	real	Charge storage G-D junction	listed by show only when all parameters are asked for
`cqgs`	real	Capacitance due to charge storage G-S junction	listed by show only when all parameters are asked for
`cqgd`	real	Capacitance due to charge storage G-D junction	listed by show only when all parameters are asked for
`p`	real	Power dissipated by the JFET2	listed by show only when all parameters are asked for
`vtrap`	real	Quiescent drain feedback potential	listed by show only when all parameters are asked for
`vpave`	real	Quiescent power dissipation	listed by show only when all parameters are asked for

Model parameters (44)

Input and output (41)

name	type	description	notes
`njf`	flag	N type JFET2 model
`pjf`	flag	P type JFET2 model
`vto` (also `vt0`)	real	Threshold voltage
`pb` (also `vbi`)	real	Gate junction potential
`acgam`	real
`af`	real	Flicker Noise Exponent
`beta`	real	Transconductance parameter
`cds`	real	D-S junction capacitance	ac
`cgd`	real	G-D junction capacitance	ac
`cgs`	real	G-S junction capacitance	ac
`delta`	real	coef of thermal current reduction
`hfeta`	real	drain feedback modulation
`hfe1`	real
`hfe2`	real
`hfg1`	real
`hfg2`	real
`mvst`	real	modulation index for subtreshold current
`mxi`	real	saturation potential modulation parameter
`fc`	real	Forward bias junction fit parm.
`ibd`	real	Breakdown current of diode jnc
`is`	real	Gate junction saturation current
`kf`	real	Flicker Noise Coefficient
`lambda`	real	Channel length modulation param.
`lfgam`	real	drain feedback parameter
`lfg1`	real
`lfg2`	real
`n`	real	gate junction ideality factor
`p`	real	Power law (triode region)
`q`	real	Power Law (Saturated region)
`rd`	real	Drain ohmic resistance
`rs`	real	Source ohmic resistance
`taud`	real	Thermal relaxation time
`taug`	real	Drain feedback relaxation time
`vbd`	real	Breakdown potential of diode jnc
`ver`	real	version number of PS model
`vst`	real	Crit Poten subthreshold conductn
`xc`	real	amount of cap. red at pinch-off
`xi`	real	velocity saturation index
`z`	real	rate of velocity saturation
`hfgam`	real	high freq drain feedback parm
`tnom`	real	parameter measurement temperature	listed by show only when all parameters are asked for

Output only (3)

name	type	description	notes
`type`	string	N-type or P-type JFET2 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

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.