Ossila FACT1 User Manual page 17

enabling
innovative electronics
When the substrate is placed in the holder, each device is probed by a pair of Drain and Source
probes. If the device is switched on, the Drain probe connects the Drain of the device to the High
output of the DRAIN SMU, while the Source is connected to the DRAIN SMU ground. If a particular
Gate is switched on, the corresponding Gate probe connects it to the signal generated by the GATE
SMU. Figure 4 shows which column of POGOS are Drain or Source probes.
Column of Source
Probes Device 16
Figure 4. Location of Signal and Source Drain probes for Dev 16. The first column (on the left)
therefore acts as the Source (ground), while the second is used to apply the desired voltage (Drain)
to the transistors. This pattern (alternate Source and Drain columns) repeats itself for the
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Place the substrate so that the Gate
pads are in the row nearest the front
panel
Figure 3. Orientation of the substrate
Column of Signal Drain
Probes Device 16
successive six columns.
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Row of Gate Probes
17