MOSFET Device
The Spectre MOSFET device is translated as either a nonlinear N-type or a nonlinear P-type MOSFET device. For information on MOSFET models, refer to MOSFET and JFET Models.
Example Spectre Command Line:
- nch1 (1 2 0 0) nchmod1 l=2u w=15u ad=60p as=37.5p pd=23u ps=6u
Spectre Netlist Syntax:
- name nd ng ns nb mname [param=value]*
ADS Netlist Syntax:
- mname:mid nd ng ns nb [param=value]*
ADS Schematic Symbol:
Instance Parameters:
For information on parameter format, refer to Using Parameter Mapping Tables to Understand a Translation
Table 7-10. Level 1 MOSFET Parameter Mapping
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Length
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m
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l
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m
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Width
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m
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w
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m
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Ad
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m2
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ad
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m2
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As
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m2
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as
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m2
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Pd
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m
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pd
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m
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Ps
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m
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ps
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m
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Nrd
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nrd
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m/m
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Nrs
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nrs
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m/m
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Region
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on
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region
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triode
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_M
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1
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m
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1
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Parameters not in Spectre Model
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Temp 
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°C
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25
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NMOS
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yes
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PMOS
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no
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Mode
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1
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Noise
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yes
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Parameters not in ADS Model
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trise
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°C
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0.0
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ld
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m
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ls
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m
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degradation
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no
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Temp = trise + temp ("temp" is an ADS global variable)
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Table 7-11. BSIM3v3 Parameter Mapping
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Length
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m
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l
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m
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Width
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m
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w
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m
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Ad
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m2
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ad
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m2
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As
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m2
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as
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m2
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Pd
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m
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pd
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m
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Ps
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m
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ps
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m
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Nrd
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nrd
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m/m
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Nrs
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nrs
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m/m
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Region
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fwd
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region
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triode
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Nqsmod
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nqsmod
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_M
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1
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m
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1
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Parameters not in Spectre Model
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Geo
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1
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NMOS
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yes
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PMOS
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no
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Mode
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1
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Noise
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yes
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Temp
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°C
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25
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Parameters not in ADS Model
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trise
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°C
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Temp = trise + temp ("temp" is an ADS global variable)
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Table 7-12. Model9 MOSFET Parameter Mapping
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Length
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m
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1e-4
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l
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m
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1.0° scale
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Width
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m
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1e-4
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w
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m
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1.0° scale
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Region
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on
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region
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triode
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_M
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1
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m
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1
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Mult
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1
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mult
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1
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Mult
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1
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area
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1
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Parameters not in Spectre Model
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Model
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Temp
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°C
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25
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Ab
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m2
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1e-12
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Ls
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m
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1e-4
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Lg
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m
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1e-4
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Mode
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nonlinear
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Parameters not in ADS Model
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mult
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1
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Temp = trise + temp ("temp" is an ADS global variable)
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Comments:
- The Netlist Translator looks up the model statement referenced by the model name on the instance line to determine which ADS MOSFET device to place. For more information on MOSFET Models, refer to MOSFET and JFET Models.
- If trise is provided, Temp=trise+temp (temp is an ADS global variable).
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