Arduino BiCMOS Curve Tracer

Draw curve traces for both Bipolar and CMOS transistors using this hardware and free online software.

Step 1 UpLoad and Plot Curve for NPN, PNP, NMOS, and PMOS

The data for the transistor curves gets uploaded into any computer and can be plotted using SciLab or Octave

Comments

[magnu]

Where does the hysteresis in the curves come from?
Is it device warming?

To be able to use these curves for paramter matching, it is very important to know that the data was sampled under steady conditions.

[dsauer]

The looping is due to a capacitance effect. The matching of beta for the bipolar can only be measured, because a current it being supplied to the base by a resistor. Normal bipolar matching is usually done by applying the same emitter base voltage to two transistors and measuring the match of collector current. If you want to do this, the schematic would only need one or two resistors, with a complete redesign of all the software. You can measure match of CMOS devices.