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SeCTIon 5
Using Substrate Bias
6 . Select the TSPLINK_CFG menu . (If the Series 2600
instruments used have firmware Revision 1 . 4 . 0 or later
installed, the menu name should be TSPLINK . )
7 . Select the RESET to initialize the TSP-Link .
5 .
Turn on the computer and start Test Script Builder (TSB) .
Once the program has started, open a session by connecting
to the master instrument . For details on how to use TSB, see
the Series 2600 Reference Manual .
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 'FET_Comm_Source_Vsb.tsp' after downloading it to
your PC .
If your computer is currently connected to the Internet, click
on the following link to begin downloading:
keithley.com/data?asset=50921.
6 .
Install an NPN FET such as an SD210 in the appropriate tran-
sistor 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-
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
Figure 5-6. Program 13 typical results: Common-source characteristics with substrate bias
5-6
(Program
http://www.
Common-Source Characteristics
with Substrate Bias (SD210)
1.00E–01
8.00E–02
6.00E–02
4.00E–02
2.00E–02
0.00E+00
0
1
2
3
function 'FET_Comm_Source_Vsb()' . This can be done by
typing the text 'FET _ Comm _ Source _ Vsb()' after the
active prompt in the Instrument Console line of TSB .
9 .
In the program '
FET _ Comm _ Source _ Vsb(vgsstart, vgsstop,
vgssteps,
vsbsource) is created .
•
vgsstart
voltage sweep
•
vgsstop
13),
voltage sweep
•
vgssteps
•
vdsstart
voltage sweep
•
vdsstop
voltage sweep
•
vdssteps
•
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 gate-
source (V
) voltage sweep start value at 1V, the gate-source
GS
sweep stop value at 12V and the number of steps to be 10,
the drain-source (V
drain-source sweep stop value at 12V and the number of steps
to be 80, and the substrate bias to be –2V, you would send
4
5
6
7
8
V
(Volts)
DS
FET_Comm_Source_Vsb().tsp', the function
vdsstart,
vdsstop,
represents the start value for the gate-source
represents the stop value for the gate-source
represents the number of steps in the sweep
represents the start value for the drain-source
represents the stop value for the drain-source
represents the number of steps in the sweep
represents the substrate bias voltage
) voltage sweep start value at 1V, the
DS
V
= 10V
GS
V
= 7.5V
GS
V
= 5V
GS
V
= 2.5V
GS
V
= 0V
GS
9
10
vdssteps,
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