In this section:
Introduction .............................................................................. 7-1
Equipment required .................................................................. 7-1
Set up remote communications ................................................ 7-2
Set up external hardware triggers ............................................ 7-2
Device connections .................................................................. 7-4
Remote control of FET testing using SCPI commands ............ 7-5
Remote control of FET testing using TSP commands .............. 7-9
Introduction
This example application demonstrates how to use two Model 2450 instruments to perform I-V
characterization of field effect transistors (FETs). The Model 2450 is a good choice for semiconductor
device testing because it can quickly and accurately source and measure both current and voltage.
Determining the I-V parameters of FETs helps you ensure that they function properly in their intended
applications, and that they meet specifications. There are many I-V tests that you can perform with
the Model 2450, including gate leakage, breakdown voltage, threshold voltage, transfer
characteristics, and drain current. The number of Model 2450 instruments required for testing
depends on the number of FET terminals that must be biased and measured.
This example application shows you how to perform a drain family of curves (Vds-Id) on a
three-terminal MOSFET. The MOSFET is the most commonly used FET because it is the basis for
digital integrated circuits.
Equipment required
•
Two Model 2450 Interactive SourceMeter
®
instruments
•
Four triaxial cables (Keithley part number 7078-TRX-10)
•
A metal-shielded test fixture or probe station with female triaxial connectors
•
A triaxial tee connector (Keithley part number 237-TRX-T)
•
Cabling for external hardware triggers is different depending on the command set you are using:
•
For SCPI commands, use a DB-9 male-to-male 9-pin cable to connect the digital I/O ports on the back
of the Model 2450 instruments to each other.
•
For TSP commands, you need a TSP-Link crossover cable (one Keithley Model CA-180-3A is included
with your Model 2450) to connect the TSP-Link ports on the rear panel of the Model 2450 instruments to
each other.
Section 7
Measuring I-V characteristics of FETs
