5-10
SECTION 5
Using Substrate Bias
vstart
• : 0V
vstop
• : 10V
vsteps
• : 100
Finally, Node 2 SMUA, which provides substrate bias, is
programmed:
Source V•
Local sensing•
100mA compliance, autorange measure•
vsbsource
• : 1V
After the instruments have been set up, the outputs are zeroed and
enabled. The substrate bias (V
SB
) and first base current (I
B
) values
are applied. Then, the collector-emitter voltage sweep begins. At
each point in the sweep, the collector current is measured. The
program enters the main program loop to perform five I
C
vs. V
CE
sweeps, one for each of five I
B
values.
Upon completion of the base current sweep, all outputs are
zeroed and disabled. The data is written to the Instrument Con-
sole of TSB.
5.4.5 Modifying Program 14
For different sweeps, the base current start, stop, step, and
the collector-emitter voltage start, stop, and step values can be
changed as required. For different sweep lengths, loop counter
values must be adjusted accordingly.
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