Analog Electronics with LabVIEW®

P10.4. Evaluation of the Bias Setup

Procedure SetVoID.vi sends out the gate voltage of the driver transistor (M1, NMOS) and then sweeps Chan1_out to set the output bias voltage (Chan1_in) at VDD/2. This VI is a subVI in the gain measurement VI (below, next part). To run this VI as a top VI, set the Index to zero. Set Chan0_out Initial to 0V. Run SetVoID.vi while adjusting VGS for the lowest value of the ID range of about 50 μA. Verify that the bias-setting circuit functions properly. Adjust the Control-Loop Constant to obtain a final dc value ...