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istop, isteps, vstart, vstop, vsteps,
vsbsource) is created .
•
represents the start value for the base current
istart
sweep
•
represents the stop value for the base current
istop
sweep
•
represents the number of steps in the sweep
isteps
•
represents the start value for the collector-
vstart
emitter voltage sweep
•
represents the stop value for the collector-emitter
vstop
voltage sweep
•
represents the number of steps in the sweep
vsteps
•
represents the substrate bias voltage
vsbsource
If these values are left blank, the function will use the default
values given to the variables, but you can specify each vari-
able value by simply sending a number that is in-range in the
function call . As an example, if you wanted to have the base
current (I
) current sweep start value at 20µA, the base cur-
B
rent sweep stop value at 200µA and the number of steps to
be 10, the collector-emitter (V
at 1V, the collector-emitter sweep stop value at 12V and the
number of steps to be 80, and the substrate bias to be –2V, you
would send BJT _ Comm _ Em
200E-6, 10, 1, 12, 80, -2) to the instrument .
10 .
The sources will be enabled, and the substrate bias is applied,
the base current value is applied, and the collector-emitter
Figure 5-8. Program 14 typical results: Common-emitter characteristics with substrate bias
) voltage sweep start value
CE
t _ Vsb(20E-6,
Common-Emitter Characteristics
with Substrate Bias
5.00E–02
4.00E–02
3.00E–02
2.00E–02
1.00E–02
0.00E+00
0
1
2
3
voltage sweep is executed . The base current value is then
incremented and the collector-emitter sweep is re-run .
11 .
Once the gate-source sweep has been completed, the data (I
V
, V
, and I
) will be presented in the Instrument Console
SB
CE
C
window of TSB .
5.4.3 Typical Program 14 Results
Figure 5-8 shows a typical plot generated by example Program 14 .
5.4.4 Program 14 Description
After both instruments are returned to default conditions, Node 1
SMUB, which sweeps IB, is configured as follows:
•
Source I
•
IV compliance, 1 . 1 V range
•
Local sense
•
: 10µA
istart
•
: 50µA
istop
•
: 5
isteps
Next, Node 1 SMUA, which sweeps V
to operate in the following manner:
•
Source V
•
Local sensing
•
100mA compliance, autorange measure
•
1 NPLC Line cycle integration
4
5
6
7
8
V
(Volts)
BE
Using Substrate Bias
and measures I
CE
I
= 50µA
B
I
= 40µA
B
I
= 30µA
B
I
= 20µA
B
I
= 10µA
B
9
10
SeCTIon 5
,
B
, is set up
C
5-9
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