This repository contains several drivers for measuring transistor IV-curves of single or two-transistor configurations for the Keysight U2722A SMU (https://www.keysight.com/us/en/products/source-measure-units-smu/u2722a-u2723a-usb-modular-source-measure-units-smu.html). A detailed description of every VI-file, along with a use case is given below. SMU_IV single.vi uses a single U2722A SMU, but the other Virtual Instruments (VIs) require 4 SM channels, so 2 SMU's are needed. Using LabView drivers instead of the proprietary PathWave BenchVue Software has the advantage of having a more detailed control over the experiments.
Simple current-voltage characterization of a transistor (https://en.wikipedia.org/wiki/Current%E2%80%93voltage_characteristic). For each gate voltage, the drain-source voltage is swept over a certain range. The interface of this program is shown below:
Analogous to the previous experiment, but using an additional SMU to concurrently and independently characterize 2 transistors. This is useful when characterizing a large amount of transistors, e.g. on a wafer.
The purpose of this program is illustrated in the figure below:
This setup allows for a variety of configurations. In the simplest case, you can have a transistor with a resistive load. In this example, T2 represents an active load in a cascode with PNP BJTs, where the gate voltage can be swept or kept constant.
The interface of the instrument is shown below:
Similar to the previous VI, but simpler in the sense that only the first gate voltage is swept, while the second gate is biassed by a constant voltage. Thus, the previous program is more general.
New data is appended to the target file, to ensure that experiments are not accidentally overwritten. For the two-transistor configurations, the order of the sweeps is as follows: gate 1 (the "input"), Vdd, gate 2 (if not constant). This should help with the interpretation of the results.
These drivers were written for the Translational Neuroelectronics Lab at Columbia University, led by Prof. Dion Khodagholy (https://www.dion.ee.columbia.edu/).