Bias Circuit

Procedure
according to their functions (as in AmpP2.1.vi).
• Connect the circuit using the RD selected. Install the value of RD(MΩ) in the
Digital Control. To obtain three digits of precision in the resistor Digital
Control, Right Click on the Control and go to Format and Precision... Set Digits
of Precision.
• Run AmpP2.1.vi with VDD (Chan0_out) set at 10 V. Adjust VGS (Chan1_out)
for a drain voltage, VDS, of roughly 8 to 9 V. Obtain a log of the Front Panel
to preserve the current (ID) and VGS information for the Mathcad file.
Reminder: Data Logging is under the Operate menu.
• Now reset VDD to 6 V and re-run. Note that VDS drops by roughly 4 V,
indicating that the transistor drain terminal is a current source. Note that the
change in the ID indicated is only slight.
• Reset VDD = 10 V. Increase VGS by an amount that makes VDS about 2 to 3
V. Note the increase in drain current. Log the Front Panel to preserve the
information for the Mathcad file.