5-6
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 .
Turn on the computer and start Test Script Builder (TSB) .
5 .
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 (
Program 13
),
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:
http://www.
keithley.com/data?asset=50921
.
Install an NPN FET such as an SD210 in the appropriate tran-
6 .
sistor socket of the test fixture .
Now, we must send the code to the instrument . The simplest
7 .
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 .
Once the code has been placed in the instrument run-time
8 .
memory, we can run it at any time simply by calling the
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 .
In the program ‘
9 .
FET_Comm_Source_Vsb().tsp
’, the function
FET _ Comm _ Source _ Vsb(vgsstart, vgsstop,
vgssteps, vdsstart, vdsstop, vdssteps,
vsbsource)
is created .
vgsstart
•
represents the start value for the gate-source
voltage sweep
vgsstop
•
represents the stop value for the gate-source
voltage sweep
vgssteps
•
represents the number of steps in the sweep
vdsstart
•
represents the start value for the drain-source
voltage sweep
vdsstop
•
represents the stop value for the drain-source
voltage sweep
vdssteps
•
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 gate-
source (V
GS
) voltage sweep start value at 1V, the gate-source
sweep stop value at 12V and the number of steps to be 10,
the drain-source (V
DS
) voltage sweep start value at 1V, the
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
Common-Source Characteristics
with Substrate Bias (SD210)
V
DS
(Volts)
V
GS
= 10V
V
GS
= 7.5V
V
GS
= 5V
V
GS
= 2.5V
V
GS
= 0V
I
D
S
(
A
m
p
s)
1.00E–01
8.00E–02
6.00E–02
4.00E–02
2.00E–02
0.00E+00
0
1
2
3
4
5
6
7
8
9
10
Figure 5-6. Program 13 typical results: Common-source characteristics with substrate bias
Summary of Contents for Series 2600
Page 5: ......
Page 7: ......
Page 17: ...2 8 Section 2 Two terminal Device Tests...
Page 39: ...4 10 Section 4 FET Tests...
Page 53: ...6 4 Section 6 High Power Tests...
Page 130: ...A 77 Appendix A Scripts BJT_Comm_Emit_Vsb...
Page 136: ...Click below to find more Mipaper at www lcis com tw Mipaper at www lcis com tw...
