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SeCTIon 4
FET Tests
Series 2600
SourceMeter
Figure 4-1. Test configuration for common-source tests
6 .
Install an N-channel FET such as an SD210 in the appropriate
transistor socket of the test fixture .
7 .
Now, we must send the code to the instrument . The simplest
method is to right-click in the open script window of TSB,
and select 'Run as TSP file' . This will compile the code and
place it in the volatile run-time memory of the instrument .
To store the program in non-volatile memory, see the "TSP
Programming Fundamentals" section of the Series 2600 Refer-
ence Manual .
8 .
Once the code has been placed in the instrument run-time
memory, we can run it at any time simply by calling the func-
tion 'FET _ Comm _ Source()' . This can be done by typing
the text 'FET _ Comm _ Source()' after the active prompt
in the Instrument Console line of TSB .
9 .
In the program '
FET_Comm_Source.tsp', the function FET _
Comm _ Source(vgsstart, vgsstop, vgssteps,
vdsstart, vdsstop, vdssteps) is created .
•
represents the initial voltage value in the
vgsstart
gate-source V
sweep
GS
•
represents the final voltage value in the gate-
vgsstop
source V
sweep
GS
•
represents the number of steps in the sweep
vgssteps
•
represents the initial voltage value in the
vdsstart
drain-source V
sweep
DS
•
represents the final voltage value in the drain-
vdsstop
source V
sweep
DS
•
represents the number of steps in the sweep
vdssteps
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
4-2
Under Test
Output HI
I
System
Channel B
V
Sweeps V
GS
Output LO
FET
Test
V
DS
Fixture
V
GS
the function call . As an example, if you wanted to have the
start voltages for V
be 11V, and the number of steps be 20, you would send
FET _ Comm _ Source(1, 11, 20, 1, 11, 20) to
the instrument .
10 .
The sources will be zeroed and then enabled . The program
will execute a sweep of V
2V steps . At each V
and 10V at 0 . 1 V increments . At each increment, I
measured .
11 .
Once the measurements have been completed, the data (V
V
, and I
DS
window of TSB .
4.3.3 Typical Program 9 Results
Figure 4-2 shows a typical plot generated by example Program 9 .
A 2N4392 N-channel JFET was used to generate these curves .
4.3.4 Program 9 Description
The unit is returned to default conditions . Next, SMUB, which
sweeps V
, is programmed as follows:
GS
•
Source V
•
1mA compliance, 1mA range
•
Local sense
•
vgsstart
•
vgsstop
•
vgssteps
SMUA, which sweeps V
follows:
I
D
Output HI
Series 2600
System
I
SourceMeter
Channel A
Sweeps V
,
V
DS
Measures I
D
Output LO
and V
sweeps be 1V, the stop value
GS
DS
values between 0V and 10V using
GS
step, V
will be stepped between 0V
GS
DS
) will be presented in the Instrument Console
DS
: 0V
: 10V
: 5
and measures I
DS
will be
D
,
GS
, is configured as
D
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