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A. Measurement Procedure: Cob Application Test
-Starting from Application Test Library
This test approach starts measurements by using an Application Test Library, which
starts from the default setup parameters, and you have to customize the measure-
ment parameters depending on your requirements.
Setup and execute the test by following the next steps. The same instruction steps
are illustrated by the numbers on the "1. Starting from Application Test Library" side
of figure 3-28.
Step 1. Click the Application Test tab.
Step 2. Check the PowerBJT category.
Step 3,4. Select Cob (Click the Cob then click Select )
Step 5. Set the test parameters shown in figure 3-28 to an appropriate one depend-
ing on your B1505A configuration and your test device.
The important check points are;
a. Scale setup:
Select LINEAR or LOG. The example uses LOG10 scale that sweeps ten
logarithmic points per decade between VcStart and VcStop.
b. SMU setup for Collector DC bias
c. Set Vc sweep parameters
d. Set the parameter extraction conditions:
Vcb@Cbo: Collector voltage to measure Cob
e. Set MFCMU measurement parameters.
Step 6. Make sure the device is properly selected as shown in the "Device used in
the example" part or your selection.
Close the lid of N1259A test fixture.
Start the measurement. (Click the Single button )
Step 7. The graph window pops up, and the measurement starts.
Step 8. You can see the Cob-Vc graph in figure 3-29.
Figure 3-29 plots Cob in Y axis versus the collector voltage Vc in X axis. Cob is auto-
matically extracted at the specified collector voltage, and it is shown in the Parame-
ters display field.
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