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Ansoft Designer / Ansys Designer 在线帮助文档:


Nexxim Simulator >
Nexxim Component Models >
FETs (JFETs and MESFETs) >
   JFET Model (Level 1)       

JFET Model (Level 1)

The .MODEL statement for the Level 1 JFET has the netlist syntax.

.MODEL modelname NJF [LEVEL=1] [modelparameter=val] ...

or

.MODEL modelname PJF [LEVEL=1] [modelparameter=val] ...

The entry NJF selects the N-channel JFET, while PJF selects the P-channel JFET.

 


Level 1 and Level 2 JFET Model Parameters

Model Parameter

Description

Unit

Default

LEVEL

1 selects the Basic SPICE JFET model

None

1 (default if LEVEL parameter is omitted)

ACM

Gate area calculation method

None

0

AF

Flicker noise exponent

None

1.0

ALIGN

Correction for gate misalignment

Meter

0.0

ALPHA (ALFA, ALPHA1)

Saturation factor

Volt-1

2.0

AREA

Area factor

None

1.0

BETA

Transconductance (gain)

Amp/Volt2

1.0e-4

BEX

Temperature exponent to correct for low field mobility

None

0.0

CAPOP

Capacitor model selector

None

0

CAPDS (CDS)

Drain-source capacitance

Farad

0.0

CGD

Zero-bias gate-drain junction capacitance

ACM = 0 : Farad
ACM = 1 :
Farad/Meter2

0.0

CGS

Zero-bias gate-source junction capacitance

ACM = 0 : Farad
ACM = 1 :
Farad/Meter2

0.0

CRAT

Source ratio of gate capacitance

None

0.666

CTD

Temperature coefficient for gate-drain junction capacitance

°C-1

0.0

CTS

Temperature coefficient for gate-drain junction capacitance

°C-1

0.0

DCAP

Capacitance equation selector

None

2

EG

Energy gap for gate-drain and gate-source diodes at 0 °K.

electron-Volt

1.11

FC

Coefficient for PB in forward-bias capacitance calculations

None

0.5

GAMDS (GAMMA, GAMA)

Lowering coefficient for drain voltage-induced threshold voltage

None

0.0

GAP1

1st bandgap correction factor

electron-Volt/°K

7.02e-4

GAP2

2nd bandgap correction factor

°K

1108.0

GCAP

Zero-bias gate capacitance

ACM = 0 : Farad
ACM = 1 :
Farad/Meter2

Not used if not provided

GDSNOI

Channel noise coefficient (NLEV = 3)

None

1.0

HDIF

Distance of heavily-doped (low resistance) region from source or drain contact to lightly-doped region

Meter

0.0

IS

Gate junction saturation current.

ACM = 0: Amp
ACM = 1:
Amp/Meter2

1.0e-14

KF (KF4)

Flicker noise coefficient

None

0.0

L

FET gate length

Meter

0.0

LAMBDA (LAMB)

Channel length modulation factor

Volt-1

0.0

LDEL

Difference between drawn length and actual or optical device length

Meter

0.0

LDIF

Distance of lightly-doped region from heavily-doped region to transistor edge

Meter

0.0

MJ

Grading coefficient for gate-drain and gate-source diodes

None

0.50

N

Emission coefficient for gate-drain and gate-source diodes

None

1.0

NG

Gate subthreshold factor

Volt-1

0.0

NLEV

Noise equation selector

None

2

PB

Gate junction potential

Volt

0.8

RD

Drain ohmic resistance

Ohm

0.0

RG (RG2)

Gate ohmic resistance

Ohm

0.0

RS

Source ohmic resistance

Ohm

0.0

RSH

Sheet resistance of heavily-doped region

Ohm/square

0.0

RSHG

Gate sheet resistance

Ohm/square

0.0

RSHL

Sheet resistance of lightly-doped region

Ohm/square

0.0

TCV (VTOTC, AVT0)

Temperature compensation coefficient for threshold voltage VTO

°K-1

0.0

TLEV

Temperature equation selector for junction diodes

None

0.0

TLEVC

Temperature equation selector for junction capacitances and potential

None

0.0

TNOM (TREF)

Nominal circuit temperature

°C

25.0

TPB

Temperature coefficient for gate junction potential PB

Volt/°K

0.0

TRD (TRD1, ARD)

Temperature coefficient for drain resistance RD

°K-1

0.0

TRG (TRG1, ARG)

Temperature coefficient for gate resistance RG

°K-1

0.0

TRS (TRS1, ARS)

Temperature coefficient for source resistance RS

°K-1

0.0

TT

Transit time

Second

0.0

VTO (VT0, VPO)

Threshold voltage.

Volt

-2.0

W

FET gate width

Meter

0.0

WDEL

Difference between drawn width and actual or optical device width

Meter

0.0

XTI

Saturation current temperature exponent

None

3.0


 

SPICE JFET Model Netlist Example

J1 11 22 33 44 jfet1 AREA=0.97

.MODEL jfet1 NJF LEVEL=1

+ BETA=626e-6 LAMBDA=45e-3

+ VTO=-2.33 IS=0.5e-9

+ N=1.2 CGS=1e-15 CGD=1e-15

+ TT=1.0e-14 MJ=0.5 PB=0.7 FC=0.5

+ CAPOP=1

 

 




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