Figure 9 shows the model geometry, indicating how the geometry elements correspond to features in
Figure 7. In this model both the source and the base are connected to ground and the voltages applied to the drain and the gate are varied. In the first study a small voltage (10 mV) is applied to the Drain and the Gate voltage is swept from 0 to 5 V. A plot of the current flowing between the source and the drain is used to determine the turn-on voltage of the device. The second study sweeps the drain voltage from 0 to 5 V at three different values of the gate voltage (2, 3 and 4 V). The drain current versus drain voltage is then plotted at several values of the gate voltage.