Running Vgs-Id Dc Itm; Running Vgs-Id-Pulse Utm - Keithley 4200-SCS User Manual

Model 4200-SCS User's Manual

Running vgs-id DC ITM

The default settings sweep the pulses on the gate from 0-2 V in 50 mV steps and
set the drain voltage to 1 V (see
the voltages and step size used so the same settings can be used in vgs-id-pulse.
1.
2.
Figure 3-42
Default definition and typical graph for vgs-id

Running vgs-id-pulse UTM

The default Vgs-id-pulse uses the same default settings as the DC Vgs-id (see
Figure
routine and the
UTM as described in
values may be entered using the UTM GUI:
1.
2.
3.
4.
4200-900-01 Rev. K / February 2017
Double-click vgs-id ITM in the project navigator.
Click the green Run button. The Vgs-id curve will be generated and displayed on the graph.
3-43). If comparing Vgs-Id results for DC and Pulse IV, use this pulse-only
Comparing DC and pulse results
Running vgs-id-pulse-vs-dc
Ensure that the Vds, VgStart, VgStop, VgStep values match the values in the DC Vgs-id. To
sweep from a high to a low voltage, enter voltages so that VdStop < VdStart and use a
negative value for VdStep. If any values need to be modified, remember to press the Enter
key after typing in the value.
Click the green Run button.
To add or update the DC results on the pulse Graph, perform the procedure for
DC and pulse results.
To reduce noise, the smaller subthreshold currents of this test require a larger number of
measurements to be averaged. For best results on smaller signals (Id < 500uA), use
AverageNum = 0 to enable the adaptive filtering mode, where lower scope ranges will use a
large AverageNum and higher ranges a lower AverageNum. If desired, a fixed number may
be entered for AverageNum.
Return to
Section 3: Common Device Characterization Tests
Figure 3-42). When changing these settings, note
Section Topics
or use the single DC and Pulse
UTM. Alternately, the source
Comparing
3-43