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Nexxim Simulator >
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FETs (JFETs and MESFETs) >
Level 3 Triquint Extended MESFET (TOM) Model

Level 3 Triquint Extended MESFET (TOM) Model

The .MODEL statement for the Level 3 Triquint extended MESFET (TOM) model specifies values for one or more model parameters.

.MODEL modelname NJF LEVEL=3 SAT=3 ACM=1

TOM_extended_parameter=val

[modelparameter=]val] ...

.MODEL modelname PJF LEVEL=3 SAT=3 ACM=1

TOM_extended_parameter=val

[modelparameter=]val] ...

In addition to LEVEL=3 and SAT=3, the .MODEL statement must specify a value for at least one of the Triquint extended model parameters BETATCE, DELTA, or CAPDS. In addition, the area calculation method parameter ACM must be 1 to enable some TOM features. Aliases are provided for a few Level 3 parameters for compatibility with the original TOM model.

The Level 3 MESFET models use all the Level 1 and Level 2 model parameters listed in the module for the JFET Model, SPICE Model. The module MESFET Model, Curtice Model lists the additional model parameters that apply to all Level 3 MESFET models.

**TOM MESFET (SAT=3) Model Parameters**
Model Parameter	Description	Unit	Default
LEVEL	3 is required to select one of several MESFET models (see SAT parameter)	None	1 (default if LEVEL parameter is omitted)
NJF	Selects N-channel MESFET	None	None
PJF	Selects P-channel MESFET	None	None
SAT	Saturation factor (MESFET model selector) 3 is required to select the Variable saturation model or Triquint extended (TOM) model	None	0
BETATCE (ABET)	Temperature coefficient for BETA When BETATCE is nonzero, BETA(temp) = BETA(TNOM+273.15) ´ 1.01^(BETATCE^´^{(temp-TNOM+273.15))}	°C^-1	0.0
CAPDS (CDS)	Drain-source capacitance	Farad	0.0
DELTA	Ids feedback parameter.	None	0.0
GAMDS (GAMMA, GAMA)	Lowering coefficient for drain voltage-induced threshold voltage	None	0.0
MJ	Grading coefficient for gate-drain and gate-source diodes (CAPOP = 0 or 2) Step junction: 0.50 Linear graded junction: 0.33	None	0.50

TOM1 MESFET Model Netlist Example

.MODEL tqmesfet NJF LEVEL=3 SAT=3 BETATCE=1.0

.model njf NJF level=3 sat=3 vto=-3

+ beta=626e-6 lambda=0 k1=0.02

+ is=0.5e-9 tt=1.0e-14 rg=100

+ n=1.2 cgs=1e-15 cgd=1e-15

+ gamds=1e-4 ucrit=1e-2 vgexp=2.2 alpha=2.5

+ m=0.5 pb=0.7 fc=0.5 capop=1

+ n=5.0 rd=0 rs=0 satexp=3.2

*+ ng=1 nd=1

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