Bipolar junction transistor

Instance line: Qname …
Model line: .model mname npn | pnp
Terminals: collector, base, emitter, substrate
Described in: Bipolar junction transistors
Source: src/lib/dev/bjt/bjt.c

Instance parameters (48)

Input and output (5)

name	type	description	notes
`off`	flag	Device initially off	listed by show only when all parameters are asked for
`icvbe`	real	Initial B-E voltage	ac; listed by show only when all parameters are asked for
`icvce`	real	Initial C-E voltage	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
`temp`	real	instance temperature	listed by show only when all parameters are asked for

Input only (2)

name	type	description	notes
`ic`	real vector	Initial condition vector
`sens_area`	flag	flag to request sensitivity WRT area

Output only (41)

name	type	description	notes
`colnode`	integer	Number of collector node	listed by show only when all parameters are asked for
`basenode`	integer	Number of base node	listed by show only when all parameters are asked for
`emitnode`	integer	Number of emitter node	listed by show only when all parameters are asked for
`substnode`	integer	Number of substrate node	listed by show only when all parameters are asked for
`colprimenode`	integer	Internal collector node	listed by show only when all parameters are asked for
`baseprimenode`	integer	Internal base node	listed by show only when all parameters are asked for
`emitprimenode`	integer	Internal emitter node	listed by show only when all parameters are asked for
`ic`	real	Current at collector node
`ib`	real	Current at base node
`ie`	real	Emitter current
`is`	real	Substrate current	listed by show only when all parameters are asked for
`vbe`	real	B-E voltage
`vbc`	real	B-C voltage
`gm`	real	Small signal transconductance
`gpi`	real	Small signal input conductance - pi
`gmu`	real	Small signal conductance - mu
`gx`	real	Conductance from base to internal base
`go`	real	Small signal output conductance
`geqcb`	real	d(Ibe)/d(Vbc)	listed by show only when all parameters are asked for
`gccs`	real	Internal C-S cap. equiv. cond.	listed by show only when all parameters are asked for
`geqbx`	real	Internal C-B-base cap. equiv. cond.	listed by show only when all parameters are asked for
`cpi`	real	Internal base to emitter capactance
`cmu`	real	Internal base to collector capactiance
`cbx`	real	Base to collector capacitance
`ccs`	real	Collector to substrate capacitance
`cqbe`	real	Cap. due to charge storage in B-E jct.	listed by show only when all parameters are asked for
`cqbc`	real	Cap. due to charge storage in B-C jct.	listed by show only when all parameters are asked for
`cqcs`	real	Cap. due to charge storage in C-S jct.	listed by show only when all parameters are asked for
`cqbx`	real	Cap. due to charge storage in B-X jct.	listed by show only when all parameters are asked for
`cexbc`	real	Total Capacitance in B-X junction	listed by show only when all parameters are asked for
`qbe`	real	Charge storage B-E junction	listed by show only when all parameters are asked for
`qbc`	real	Charge storage B-C junction	listed by show only when all parameters are asked for
`qcs`	real	Charge storage C-S junction	listed by show only when all parameters are asked for
`qbx`	real	Charge storage B-X junction	listed by show only when all parameters are asked for
`p`	real	Power dissipation	listed by show only when all parameters are asked for
`sens_dc`	real	dc sensitivity	listed by show only when all parameters are asked for
`sens_real`	real	real part of ac sensitivity	listed by show only when all parameters are asked for
`sens_imag`	real	dc sens. & imag part of ac sens.	listed by show only when all parameters are asked for
`sens_mag`	real	sensitivity of ac magnitude	listed by show only when all parameters are asked for
`sens_ph`	real	sensitivity of ac phase	listed by show only when all parameters are asked for
`sens_cplx`	complex	ac sensitivity	listed by show only when all parameters are asked for

Model parameters (52)

Input and output (43)

name	type	description	notes
`npn`	flag	NPN type device	listed by show only when all parameters are asked for
`pnp`	flag	PNP type device	listed by show only when all parameters are asked for
`is`	real	Saturation Current
`bf`	real	Ideal forward beta
`nf`	real	Forward emission coefficient
`vaf` (also `va`)	real	Forward Early voltage
`ikf` (also `ik`)	real	Forward beta roll-off corner current
`ise`	real	B-E leakage saturation current
`ne`	real	B-E leakage emission coefficient
`br`	real	Ideal reverse beta
`nr`	real	Reverse emission coefficient
`var` (also `vb`)	real	Reverse Early voltage
`ikr`	real	reverse beta roll-off corner current
`isc`	real	B-C leakage saturation current
`nc`	real	B-C leakage emission coefficient
`rb`	real	Zero bias base resistance
`irb`	real	Current for base resistance=(rb+rbm)/2
`rbm`	real	Minimum base resistance
`re`	real	Emitter resistance
`rc`	real	Collector resistance
`cje`	real	Zero bias B-E depletion capacitance	ac
`vje` (also `pe`)	real	B-E built in potential	ac
`mje` (also `me`)	real	B-E junction grading coefficient	ac
`tf`	real	Ideal forward transit time	ac
`xtf`	real	Coefficient for bias dependence of TF	ac
`vtf`	real	Voltage giving VBC dependence of TF	ac
`itf`	real	High current dependence of TF	ac
`ptf`	real	Excess phase	ac
`cjc`	real	Zero bias B-C depletion capacitance	ac
`vjc` (also `pc`)	real	B-C built in potential	ac
`mjc` (also `mc`)	real	B-C junction grading coefficient	ac
`xcjc`	real	Fraction of B-C cap to internal base	ac
`tr`	real	Ideal reverse transit time	ac
`cjs` (also `ccs`)	real	Zero bias C-S capacitance	ac
`vjs` (also `ps`)	real	Substrate junction built in potential	ac
`mjs` (also `ms`)	real	Substrate junction grading coefficient	ac
`xtb`	real	Forward and reverse beta temp. exp.
`eg`	real	Energy gap for IS temp. dependency
`xti`	real	Temp. exponent for IS
`fc`	real	Forward bias junction fit parameter
`tnom`	real	Parameter measurement temperature
`kf`	real	Flicker Noise Coefficient
`af`	real	Flicker Noise Exponent

Output only (9)

name	type	description	notes
`type`	string	NPN or PNP
`invearlyvoltf`	real	Inverse early voltage:forward	listed by show only when all parameters are asked for
`invearlyvoltr`	real	Inverse early voltage:reverse	listed by show only when all parameters are asked for
`invrollofff`	real	Inverse roll off - forward	listed by show only when all parameters are asked for
`invrolloffr`	real	Inverse roll off - reverse	listed by show only when all parameters are asked for
`collectorconduct`	real	Collector conductance	listed by show only when all parameters are asked for
`emitterconduct`	real	Emitter conductance	listed by show only when all parameters are asked for
`transtimevbcfact`	real	Transit time VBC factor	listed by show only when all parameters are asked for
`excessphasefactor`	real	Excess phase fact.	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.