JFET_Model:Junction Field Effect Transistor Model
The Spectre jfet model is translated to the ADS JFET_Model. For translation information on the JFET device, refer to JFET Device.
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 Spectre Command Line:
- model jmod jfet beta=9e-5 lambda=0 type=n vt0=-18.7 rd=10 rs=10 cgs=1.3e-13 pb=0.65
Spectre Netlist Syntax:
- model mname jfet type=[n|p] [param=value]*
ADS Netlist Syntax:
- model mname JFET NFET=[0|1] PFET=[0|1] [param=value]*
ADS Schematic Symbol:
Model Parameters:
For information on parameter format, refer to Using Parameter Mapping Tables to Understand a Translation.
Table 8-12. JFET_Model Parameter Mapping
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NFET
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yes
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type
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n (NFET)
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PFET
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no
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type
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n (NFET)
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Vto
|
V
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-2.0
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vto
|
V
|
-2.0
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Beta
|
A/V2
|
1E-4
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beta
|
A/V2
|
1E-4
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Lambda
|
1/V
|
0.0
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lambda
|
1/V
|
0.0
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Rd
|
Ohms
|
0.0
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rd
|
Ohms
|
0.0
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Rs
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Ohms
|
0.0
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rs
|
Ohms
|
0.0
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Is
|
A
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1E-14
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is
|
A
|
1E-14
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Cgs
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F
|
0.0
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cgs
|
F
|
0.0.
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Cgd
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F
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0.0
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cgd
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F
|
0.0
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Pb
|
V
|
1.0
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pb
|
V
|
1.0
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Fc
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|
0.5
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fc
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|
0.5
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Tnom
|
°C
|
25
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tnom
|
°C
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Set by defaults
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see Temp instance parameter)
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trise 
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°C
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0.0
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Kf
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0.0
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kf
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|
0.0
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Af
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|
1.0
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af
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|
1.0
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Imax
|
A
|
1.6
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imax
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A
|
1.0
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N
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|
1.0
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n
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|
1.0
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Alpha
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1/V
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0.0
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ai
|
1/V
|
0.0
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Vk
|
V
|
0.0
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bi
|
V
|
0.0
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Vtotc
|
V/°C
|
0.0
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tcv
|
1/°C
|
0.0
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Xti
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|
3.0
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xti
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|
3.0
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wBvgs
|
V
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infinity
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bvj
|
V
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infinity
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wBvgd
|
V
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infinity
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bvj
|
V
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infinity
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Parameters not in Spectre Model
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Isr
|
A
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0.0
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Nr
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2.0
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M
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0.5
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Ffe
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|
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Betatce
|
%/°C
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0.0
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|
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wVgfwd
|
V
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infinity
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wBvds
|
V
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infinity
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wIdsmax
|
A
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infinity
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wPmax
|
W
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infinity
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Secured
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Parameters not in ADS Model
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level
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1
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lambda1
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1/V
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0.0
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rg
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Ohms
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0.0
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rb
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Ohms
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0.0
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minr
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Ohms
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0.1
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tt
|
Sec
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0.0
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mj
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0.5
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kfd
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0.0
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afg
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1.0
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imelt
|
A
|
imax
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dskip
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yes
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np
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2.0
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alpha
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|
2.0
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io
|
A
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0.0
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ns
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1.0
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tlev
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|
0.0
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tlevc
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|
0.0
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eg
|
V
|
1.12452
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gap1
|
V/°C
|
7.02E-4
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|
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gap2
|
°C
|
1108
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lto
|
°C
|
0.0
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lte
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0.0
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tc1
|
1/°C
|
0.0
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tc2
|
1/°C2
|
0.0
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alarm
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none
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vtop
|
V
|
0.6
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vtos
|
V
|
1.2
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vtoe
|
V
|
0.33
|
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vtoc
|
V
|
3.3
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isb
|
A
|
1E-14
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nb
|
|
1.0
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cgbs
|
F
|
0.0
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cgbd
|
F
|
0.0
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mjb
|
|
0.5
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pbb
|
V
|
1.0
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bto
|
°C
|
0.0
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bte
|
|
0.0
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