Keithley Series 2600 User Manual

5-9
SECTION 5
Using Substrate Bias
istop, isteps, vstart, vstop, vsteps,
vsbsource) is created.
istart • represents the start value for the base current
sweep
istop • represents the stop value for the base current
sweep
isteps • represents the number of steps in the sweep
vstart • represents the start value for the collector-
emitter voltage sweep
vstop • represents the stop value for the collector-emitter
voltage sweep
vsteps • represents the number of steps in the sweep
vsbsource • represents the substrate bias voltage
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
B
) current sweep start value at 20µA, the base cur-
rent sweep stop value at 200µA and the number of steps to
be 10, the collector-emitter (V
CE
) voltage sweep start value
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 t _ Vsb(20E-6,
200E-6, 10, 1, 12, 80, -2) to the instrument.
The sources will be enabled, and the substrate bias is applied, 10.
the base current value is applied, and the collector-emitter
voltage sweep is executed. The base current value is then
incremented and the collector-emitter sweep is re-run.
Once the gate-source sweep has been completed, the data (I11.
B
,
V
SB
, V
CE
, and I
C
) will be presented in the Instrument Console
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, 1.1V range•
Local sense•
istart • : 10µA
istop • : 50µA
isteps • : 5
Next, Node 1 SMUA, which sweeps V
CE
and measures I
C
, is set up
to operate in the following manner:
Source V•
Local sensing•
100mA compliance, autorange measure•
1 NPLC Line cycle integration•
Common-Emitter Characteristics
with Substrate Bias
V
BE
(Volts)
I
B
= 10µA
I
B
= 20µA
I
B
= 30µA
I
B
= 40µA
I
B
= 50µA
I
C
(Amps)
5.00E–02
4.00E–02
3.00E–02
2.00E–02
1.00E–02
0.00E+00
0 1 2 3 4 5 6 7 8 9 10
Figure 5-8. Program 14 typical results: Common-emitter characteristics with substrate bias

Keithley Series 2600 Specifications

General

Brand	Keithley
Model	Series 2600
Category	Measuring Instruments
Language	English