6: Measure I-V characteristics of FETs Model 2470 High Voltage SourceMeter Instrument
6-14 2470-900-01 Rev. B / August 2019
-- Parse index and data into three columns.
print("Rdg #, Time (s), Current (A)")
for i = 1, defbuffer1.n do
print(string.format("%i, %.5f, %.6e", i, defbuffer1.relativetimestamps[i],
defbuffer1[i]))
end
The graph in the following figure demonstrates what the plotted drain leakage current might look like.
Figure 35: Drain leakage current graph
Set up a subthreshold current measurement using TSP
commands
The following TSP code uses the trigger model to find the subthreshold swing, S, of a FET using two
2470s communicating with each other using TSP-Link. The SMU at Node 1 is connected to the gate
and steps voltage from 0 V to 5 V. The SMU at Node 2 is connected to the drain and applies a bias
voltage while measuring current.
After the measurement is complete, a simple numerical exponential fit is found and the subthreshold
swing, S, is taken as the inverse of the exponential slope. The result and measurement data is
displayed in the Instrument Console of Test Script Builder. From the Instrument Console, you can
copy the data into a spreadsheet for graphing.
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