Help Solving an Aim-Spice HFET Modeling Issue with VAX

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SUMMARY

The forum discussion centers on troubleshooting an HFET model in Aim-Spice, specifically addressing issues related to IV modeling. The user provided a detailed circuit listing using VAX commands and a PHFET model with specific parameters. Key parameters include d1, delta, and vto, among others. The discussion highlights the need for identifying errors in the provided model and understanding the implications of the DI value on current behavior.

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  • Familiarity with Aim-Spice simulation software
  • Understanding of HFET (High Electron Mobility Transistor) modeling
  • Knowledge of SPICE syntax and commands
  • Basic concepts of IV (current-voltage) characteristics in semiconductor devices
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  • Review case studies on IV modeling in Aim-Spice to identify best practices
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Electrical engineers, semiconductor device modelers, and anyone involved in circuit simulation and HFET modeling using Aim-Spice.

ArtemSH
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Good day!

Please help me with HFET model for Aim-Spice!

I have a problem with IV modeling...

VAX
vds 1 0
vids 1 100
A1 100 2 0 Mhemt l=0.3u w=150u
vgs 2 0
.MODEL Mhemt PHFET
+d1=0.03e-6
+delta=3
+deltad=4.5e-9
+di=0.01e-6
+epsi=1.0841e-10
+eta=1.4
+lambda=0.05
+m=3
+mu=0.4
+nmax=2e16
+rd=0
+rs=0
+sigma0=0.03
+vs=0.8e5
+vto=0.7

please find a mistake in listing...

p.s soory for my english
 
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ArtemSH said:
Good day!

Please help me with HFET model for Aim-Spice!

I have a problem with IV modeling...

VAX
vds 1 0
vids 1 100
A1 100 2 0 Mhemt l=0.3u w=150u
vgs 2 0
.MODEL Mhemt PHFET
+d1=0.03e-6
+delta=3
+deltad=4.5e-9
+di=0.01e-6
+epsi=1.0841e-10
+eta=1.4
+lambda=0.05
+m=3
+mu=0.4
+nmax=2e16
+rd=0
+rs=0
+sigma0=0.03
+vs=0.8e5
+vto=0.7

please find a mistake in listing...

p.s soory for my english

Welcome to the PF. What error are you getting? Is it a SPICE compiler error, or a behavioral anomoly?
 
As the DI value of current becomes smaller, this effect should not be. How can I make with a decrease in Di current value decreased?

[PLAIN]http://imgsnack.com/images/1msm.png
 
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