Study 1
Step 1: Stationary
Now set up a Stationary study to determine the turn-on voltage for the transistor. In this study we set Vd to 10 mV and sweep over Vg.
1
In the Model Builder under Study 1, click Step 1: Stationary .
2
In the Settings window for Stationary click to expand the “Study Extensions” section.
The study extensions panel can be used to set up a parametric sweep.
3
Under the “Study Extensions” section, select the “Auxiliary sweep” checkbox.
4
From the “Sweep type” list, choose “All combinations”. This option sweeps over every combination of the specified parameters.
5
Click Add . In the table, enter the following settings:
parameter NAME
Parameter value list
Parameter unit
Vd
0.01
V
The drain voltage is fixed at a constant value of 10 mV.
6
Click Add again to add Vg to the table.
7
In the table cell for the parameter value list for Vg, enter range(0,0.2,1.4) 2 3 4. This sweeps the gate voltage between 0 and 4V with uneven step sizes, to reduce computation time and file size.
By default the “Run continuation for” setting is set to “Last parameter” (Vg in this case). This setting configures the solver to use the solution for the previous value of Vg as the initial guess for the solution when solving for the next value of Vg. It also allows the solver to take intermediate steps at values of Vg not specified in the parameter value list if necessary. Using this continuation option is a standard technique to achieve convergence for highly nonlinear equation systems such as the semiconductor equation system.
8
On the Home ribbon/toolbar click Compute .