$useassignedbiasstep

出自DDCC TCAD TOOL Manual
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$useassignedbiasstep is the function to assign exact voltage for each step. The command will be withing Vg switch and Vd switch. I would suggest to make vgstep and vdstep =0.0 and Vdstart=Vdfinal Vgstart =Vg final if this command is used.

$useassignedbiasstep
5                 ! total bias steps
0.0  0.0  0.0       ! Vg=0.0  Vd=0.0  Vs=0.0 for the first step
0.1  0.0  0.0       ! Vg=0.1  Vd=0.0  Vs=0.0 for the 2nd step  
0.2  0.0  0.0       ! Vg=0.2  Vd=0.0  Vs=0.0 for the 3rd step
0.2  0.1  0.0       ! Vg=0.2  Vd=0.1  Vs=0.0 for the 4th step
0.2  0.3  0.0       ! Vg=0.2  Vd=0.3  Vs=0.0 for the 5th  step

Examples for HENT

$useassignedbiasstep
20                 ! total bias steps
0.0  0.0  0.0        1
0.5  0.0  0.0        2
1.0  0.0  0.0        3
1.0  1.0  0.0        4
1.0  2.0  0.0        5
1.0  3.0  0.0        6
1.0  4.0  0.0        7
1.0  5.0  0.0        8 
1.0  6.0  0.0        9
1.0  7.0  0.0        10
1.0  8.0  0.0        11    
1.0  9.0  0.0        12    
1.0  10.0  0.0       13    
2.0  12.0  0.0       14 
3.0  13.0  0.0       15   
4.0  14.0  0.0       16    
5.0  15.0  0.0       17     
6.0  16.0  0.0       18   
7.0  17.0  0.0       19 
8.0  18.0  0.0       20