BJT Model-Bipolar Transistor Model

BJT_Model:Bipolar Transistor Model

The SPICE Q and Spectre bjt models are translated to the ADS NPN or PNP BJT_Model. For translation information on the BJT device, refer to Qxxxxxxx for SPICE or BJT Device for Spectre.

For more information on the ADS model, place the model in a schematic and choose Edit > Component > Edit Component Parameters to view the model parameters. You can also click Help in the component editor dialog box for additional information.

Example SPICE Command Line:

.model Qmodel1 NPN bf=100

Example Spectre Command Line:

model npn\_mod bjt type=npn is=10e-13 bf=200 va=58.8 ikf=5.63e-3 ...

SPICE and Spectre Dialect and Netlist Syntax:

Spice2/3:	.model mname NPN \| PNP [param= value]*
PSpice:	.model mname NPN \| PNP [param= value]*
HSpice:	.model mname NPN \| PNP [param= value]*
Spectre:	model mname bjt type= [ npn \| pnp ] [param= value]*

ADS Netlist Syntax:

model mname BJT NPN= [ 0 | 1 ] PNP= [ 0

1 ] [param= value]*

ADS Schematic Symbol:

Model Parameters:

For information on parameter format, refer to Using Parameter Mapping Tables to Understand a Translation.

BJT_Model Parameter Mapping
ADS	Default	Unit	Spice2/3	PSpice	HSpice	Spectre
NPN	YES		NPN	NPN	NPN	type npn
PNP	NO		NPN	NPN	NPN	type npn
Is	1.0E-16	A	x	x	x	x
Bf	100	A/A	x	x	BFM	x
Nf	1.0		x	x	x	x
Vaf	infinity	V	x	VA	VA, VBF	x
Ikf	infinity	A	x	IK	IK, JBF	x
Ise ^†	0.0	A	x	C2	C2, JLE	x
Ne	1.5		x	x	NE, NLE	x
Br	1.0	A/A	x	x	BRM	x
Nr	1.0		x	x	x	x
Var	infinity	V	x	VB	VB, VRB, BV	x
Ikr	infinity	A	x	x	JBR	x
Isc ^†	0.0	A	x	C4	C4, JLC	x
Nc	2.0		2.0	x	x	x
Rb	0.0	Ohms	x	x	x	x
Irb	infinity	A	x	x	JRB, IOB	x
Rbm	0.0	Ohms	x	x	x	rbm
Re	0.0	Ohms	x	x	x	x
Rc	0.0	Ohms	x	x	x	x
Imax		A	x	x	EXPLI 1e15	imax 1000 A
Cje	0.0	F	x	x	x	x
Vje	0.75	V	x	PE	PE	x
Mje	1/3		x	ME	ME	x
Cjc	0.0	F	x	x	x	x
Vjc	0.75	V	x	PC	PC	x
Mjc	1/3		x	MC	MC	x
Xcjc	1.0		x	x	CDIS	x
Cjs	0.0	F	x	CCS	CCS, CSUB	x
Vjs	0.75	V	x	PS	PSUB	x
Mjs	0.0		x	MS	ESUB	x
Fc	0.5		x	x	x	x
Xtf	0.0		x	x	x	x
Tf	0.0	sec	x	x	x	x
Vtf	infinity	V	x	x	x	x
Itf	0.0	A	x	x	JTF	x
Ptf	0.0	degrees	x	x	x	x
Tr	0.0	sec	x	x	x	x
Kf	0.0		x	x	x	x
Af	1.0		x	x	x	x
Kb	0.0		-	-	x	x
Fb	1.0	Hz	-	-	x	bnoisefc 1.0 Hz
Iss	0.0	A	-	x	x	x
Ns	1.0		-	x	x	x
Nk	0.5		-	x	NKF	-
Ffe	1.0		-	-	x	-
Lateral	for struct = vertical, default = yes for struct = lateral, default = no		-	-	SUBS(+1 ->0 or no, -1 -> 1 or yes)	struct for type = npn, default = vertical for type = pnp, default = lateral
RbModelÄ	MDS		////// Translator sets to Libra in schematic, 1 in netlist /////			rbmod spice
Tnom		°C	27	-	TREF	tnom Set by options 25°C
Trise	0.0	°C	-	-	-	trise 0.0°C
Tlev	0		-	-	Default=1	x
Tlevc	0		-	-	Default=1	x
Eg	1.11	eV	x	x	x	x
EgAlpha	7.04E-4	V/°C	-	-	GAP1	gap1 7.02E-4 V/°C
EgBeta	1108	K	-	-	GAP2	x
Tbf1	0.0	1/°C	-	-	x	x
Tbf2	0.0	1/°C ²	-	-	x	x
Tbr1	0.0	1/°C	-	-	x	x
Tbr2	0.0	1/°C ²	-	-	x	x
Tcbc	0.0	1/°C	-	-	CTC	ctc 0.0 1/°C
Tcbe	0.0	1/°C	-	-	CTE	cte 0.0 1/°C
Tccs	0.0	1/°C	-	-	CTS	cts 0.0 1/°C
Tikf1	0.0	1/°C	-	-	x	x
Tikf2	0.0	1/°C ²	-	-	x	x
Tikr1	0.0	1/°C	-	-	x	x
Tikr2	0.0	1/°C ²	-	-	x	x
Tirb1	0.0	1/°C	-	-	x	x
Tirb2	0.0	1/°C ²	-	-	x	x
Tis1	0.0	1/°C	-	-	x	x
Tis2	0.0	1/°C ²	-	-	x	x
Tisc1	0.0	1/°C	-	-	x	x
Tisc2	0.0	1/°C ²	-	-	x	x
Tise1	0.0	1/°C	-	-	x	x
Tise2	0.0	1/°C ²	-	-	x	x
Tiss1	0.0	1/°C	-	-	x	x
Tiss2	0.0	1/°C ²	-	-	x	x
Titf1	0.0	1/°C	-	-	x	x
Titf2	0.0	1/°C ²	-	-	x	x
Tmjc1	0.0	1/°C	-	-	x	x
Tmjc2	0.0	1/°C ²	-	-	x	x
Tmje1	0.0	1/°C	-	-	x	x
Tmje2	0.0	1/°C ²	-	-	x	x
Tmjs1	0.0	1/°C	-	-	x	x
Tmjs2	0.0	1/°C ²	-	-	x	x
Tnc1	0.0	1/°C	-	-	x	x
Tnc2	0.0	1/°C ²	-	-	x	x
Tne1	0.0	1/°C	-	-	x	x
Tne2	0.0	1/°C ²	-	-	x	x
Tnf1	0.0	1/°C	-	-	x	x
Tnf2	0.0	1/°C ²	-	-	x	x
Tnr1	0.0	1/°C	-	-	x	x
Tnr2	0.0	1/°C ²	-	-	x	x
Tns1	0.0	1/°C	-	-	x	x
Tns2	0.0	1/°C ²	-	-	x	x
Trb1	0.0	1/°C	-	-	TRB	x
Trb2	0.0	1/°C ²	-	-	x	x
Trc1	0.0	1/°C	-	-	TRC	x
Trc2	0.0	1/°C ²	-	-	x	x
Tre1	0.0	1/°C	-	-	TRE	x
Tre2	0.0	1/°C ²	-	-	x	x
Trm1	0.0	1/°C	-	-	x	x
Trm2	0.0	1/°C ²	-	-	x	x
Ttf1	0.0	1/°C	-	-	x	x
Ttf2	0.0	1/°C ²	-	-	x	x
Ttr1	0.0	1/°C	-	-	x	x
Ttr2	0.0	1/°C ²	-	-	x	x
Tvaf1	0.0	1/°C	-	-	x	x
Tvaf2	0.0	1/°C ²	-	-	x	x
Tvar1	0.0	1/°C	-	-	x	x
Tvar2	0.0	1/°C ^{2^}	-	-	x	x
Tvjc	0.0	1/°C	-	-	x	x
Tvje	0.0	1/°C	-	-	x	x
Tvjs	0.0	1/°C	-	-	x	x
Xtb	0.0		x	x	TB, TCB	x
Xti	3.0		x	PT	x	x
wVsubfwd	infinity	V	-	-	-	vsubfwd 0.2 V
wBvsub	infinity	V	-	-	-	bvsub infinity V
wBvbe	infinity	V	-	-	-	bvbe infinity V
wBvbc	infinity	V	-	-	-	bvbc infinity V
wVbcfwd	infinity	V	-	-	-	vbcfwd 0.2 V
wIbmax	infinity	A	-	-	-	imax 1e3 A
wIcmax	infinity	A	-	-	-	imax1 imax A
Imelt	Imax	A	-	-	-	imax A

SPICE Comments:

If HSpice does not set options.dcap=1, then the translator sets the ADS Fc model parameter to zero. This affects forward bias capacitance of the pn junctions.