Keithley Series 2600 User Manual

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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

) 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

) 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)

(Volts)

= 10V

= 7.5V

= 5V

= 2.5V

= 0V

(Amps)

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

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Keithley Series 2600 Specifications

General

Model	Series 2600
Measurement Functions	Voltage, Current, Resistance, Power
Resolution	Up to 6.5 digits
Current Source Range	Up to 10A
Communication Interfaces	GPIB, USB
Applications	Semiconductor testing
Category	Source Measure Unit (SMU)
Channels	Single or Dual Channel (varies by model)