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Nexxim Simulator >
Nexxim Component Models >
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] ...

or

.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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