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Making Field Effect Transistor Characterization using SMU

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Keysight Technologies

Making Field Effect Transistor Characterization Using SMU

Introduction: The Keysight’s B2900A Series Precision Source/Measure Unit (SMU) is a compact and cost-effective bench-top SMU with the capability to output and measure both voltage and current. The B2900A SMU enables you to make a wide range of current versus voltage (IV) measurements more accurately and quickly than ever before. In addition, the B2900A SMU comes with an intuitive graphical user interface (GUI) and free PC-based application software that make it easy for you to begin making productive measurements immediately. In general, Field effect transistor (FET) characterization requires applying different voltages and currents under either constant or swept conditions to the transistor terminals. The B2902A and B2912A have two SMU channels, with each channel possessing accurate IV measurement capabilities as well as the ability to supply either constant or swept voltage/current. This makes the B2902A and B2912A excellent choices for accurate IV characterization of FETs. This demonstration guide shows how easily you can make undertake FET characterization using the B2900A SMU.

Measurement Concept

An IV characteristics measurement of a field effect transistor is made based on the

following:

  • Sourcing voltage from two channels to activate a transistor.
  • The two channels work simultaneously to make measurements.
  • The limit value feature prevents the instrument from sourcing too much even if the

Source value is increased.

  • Stepping voltages from start voltage to stop voltage to make current measurements at each voltage step.
  • Voltage steps are sourced from internal voltage sources.
  • Current measurements are made by internal current meters.
  • Complicated measurements can be easily configured using Intuitive Graphical User

Interface (GUI).

  • The current-voltage curve can be easily seen by changing View mode.

Setup

1. Put the device on the device socket in the fixture

(The FET Source, Gate and Drain are connected to 1, 2 and 3 respectively. If device has a substrate terminal, it is connected to 4.).

2. Put the N1294A-001 on the Ch 1 output terminals of the B2900A SMU.

3. Put the N1294A-001 on the Ch 2 output terminals of the B2900A SMU.

4. Connect the N1294A-001 Ch 1 Low terminal to the fixture terminal 1 with a triaxial cable.

5. Connect the N1294A-001 Ch 1 High terminal to the fixture terminal 2 with a triaxial cable.

6. Connect the N1294A-001 Ch 2 Low terminal to the fixture terminal 4 with a triaxial cable.

7. Connect the N1294A-001 Ch 2 High terminal to the fixture terminal 3 with a triaxial cable.

8. Connect terminals 1 to 4 on the fixture with a black Pin-Plug Cable.

9. Close the fixture cover.

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