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•
represents the voltage bias value on the
vcebias
collector-emitter of the transistor
If these values are left blank, the function will use the default
values given to the variables, but you can specify each variable
value by simply sending a number that is in-range in the func-
tion call . As an example, if you wanted to have the base voltage
swept from 0 . 1 V to 1V in 10 steps, and the collector-emitter
voltage (V
) to be biased 5V, you would send Gummel(0.1,
CE
1, 10, 5) to the instrument .
10 .
The base-emitter voltage will be swept between 0V and 0 . 7 V in
0 . 0 1V increments, and both I
V
value . Note that a fixed collector-emitter voltage of 10V is
BE
used for the tests .
11 .
Once the sweep has been completed, the data (I
will be presented in the Instrument Console window of TSB .
3.4.4 Typical Program 5 Results
Figure 3-4 displays a typical Gummel plot as generated by
Example Program 5 . Again, the transistor used for this example
was a 2N5089 NPN silicon transistor .
3.4.5 Program 5 Description
SMUB, which sweeps V
and measures I
BE
•
Source V
•
1mA compliance, autorange measure
•
Local sensing
•
1 NPLC Line cycle integration
Figure 3-4. Program 5 results: Gummel plot
and I
will be measured at each
B
C
, I
, and V
B
C
, is set up as follows:
B
Gummel Plot (2N5089)
1.00E+00
1.00E–02
1.00E–04
1.00E–06
1.00E–08
1.00E–10
1.00E–12
1.00E–14
0
0.1
0.2
•
: 0V
vbestart
•
: 0 . 7 V
vbestop
•
: 70
vbesteps
SMUA, which sources V
following manner:
•
Source V
•
Local sensing
•
100mA compliance, autorange measure
•
1 NPLC Line cycle integration
•
Constant sweep (number of points programmed to 71),
)
BE
V
= 10V
CE
•
: 10V
vcebias
Following unit setup, both unit triggers are armed, and the instru-
ments are placed into the operate mode (lines 320 and 330) .
Once triggered, SMUB sets V
then sets V
and measures I
CE
SMUB increments V
value set for vbestop .
During the test, V
BE
completed, the data is written to the Instrument Console of TSB
and can be graphed in a spreadsheet program using the "copy-
and-paste" method of data transfer .
0.3
0.4
0.5
0.6
V
(Volts)
BE
Bipolar Transistor Tests
and measures I
, is programmed in the
CE
C
to the required value, and SMUA
BE
at I
. At the end of its measurement,
C
B
and the cycle repeats until V
BE
, I
, and I
are measured . Once the test has
B
C
V
vs. I
BE
B
V
vs. I
BE
C
0.7
SeCTIon 3
reaches the
BE
3-5
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