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SeCTIon 4
FET Tests
Series 2600
SourceMeter
Figure 4-3. Configuration for transductance tests
4.4.2 example Program 10:
Transconductance vs.
Gate Voltage Test
Use Program 10 to generate a typical g
g
vs . I
.
fs
D
1 .
With the power off, connect a dual-channel System Source-
Meter instrument to the computer's IEEE-488 interface .
2 .
Connect the test fixture to both units using appropriate
cables .
3 .
Turn on the instrument and allow the unit to warm up for two
hours for rated accuracy .
4 .
Turn on the computer and start Test Script Builder (TSB) . Once
the program has started, open a session by connecting to the
instrument . For details on how to use TSB, see the Series 2600
Reference Manual .
5 .
You can simply copy and paste the code from Appendix A in
this guide into the TSB script editing window
manually enter the code from the appendix, or import the TSP
file 'Transconductance.tsp' after downloading it to your PC .
If your computer is currently connected to the Internet, you
can click on this link to begin downloading:
keithley.com/data?asset=50916.
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 Program-
4-4
Under Test
Output HI
I
System
Channel B
V
Sweeps V
GS
Output LO
vs . V
plot as well as a
fs
GS
(Program
FET
Test
V
DS
Fixture
V
GS
ming Fundamentals" section of the Series 2600 Reference
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 'Transconductance()' . This can be done by typing
the text 'Transconductance()' after the active prompt in
the Instrument Console line of TSB .
9 .
In the program '
Transconductance(vgsstart, vgsstop,
vgssteps, vdsbias) is created .
•
vgsstart
gate-source V
•
vgsstop
source V
•
vgssteps
•
vdsbias
10),
drain-source terminal of the FET
If these values are left blank, the function will use the default
values given to the variables, but you can specify each variable
http://www.
value by simply sending a number that is in-range in the func-
tion call . As an example, if you wanted to have the start volt-
ages for V
of steps be 20, and the V
Transconductance(1, 11, 20, 5) to the instrument .
10 .
The sources will be zeroed and then enabled . The instrument
will apply V
0V and 5V using 100 steps . At each increment, I
measured .
I
D
Output HI
Series 2600
System
I
SourceMeter
Channel A
Sources V
,
V
DS
Measures I
D
Output LO
Transconductance.tsp', the function
represents the initial voltage value in the
sweep
GS
represents the final voltage value in the gate-
sweep
GS
represents the number of steps in the sweep
represents the voltage value applied to the
sweeps be 1V, the stop value be 11V, the number
GS
value as 5V, you would send
DS
and execute a sweep of V
DS
values between
GS
will be
D
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