Field Effect Transistors (FETs)

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Presentation transcript:

Field Effect Transistors (FETs) Chapter 23 Field Effect Transistors (FETs)

Objectives After completing this chapter, you will be able to: Describe the difference between transistors, JFETs, and MOSFETs Draw schematic symbols for both P-channel and N-channel JFETs, depletion MOSFETs, and enhancement MOSFETs

Objectives (cont’d.) Describe how a JFET, depletion MOSFET, and enhancement MOSFET operate Identify the parts of JFETs and MOSFETs Describe the safety precautions that must be observed when handling MOSFETs Describe the procedure for testing JFETs and MOSFETs with an ohmmeter

Junction FETs Figure 23-1. Cross section of an N-channel JFET.

Junction FETs (cont’d.) Figure 23-2. Lead connections for an N-channel JFET.

Junction FETs (cont’d.) Figure 23-3. Properly biased N-channel JFET.

Junction FETs (cont’d.) Figure 23-4. Schematic symbols for JFETs.

Figure 23-5. The polarities required to bias an N-channel JFET. Figure 23-6. The polarities required to bias a P-channel JFET.

Depletion Insulated Gate FETs (MOSFETs) Figure 23-7. N-channel depletion MOSFET.

Depletion Insulated Gate FETs (MOSFETs) (cont’d.) Figure 23-8. N-channel depletion MOSFET with bias supply.

Depletion Insulated Gate FETs (MOSFETs) (cont’d.) Figure 23-9. Schematic symbol for an N-channel depletion MOSFET.

Depletion Insulated Gate FETs (MOSFETs) (cont’d.) Figure 23-10. Properly biased N-channel depletion MOSFET.

Depletion Insulated Gate FETs (MOSFETs) (cont’d.) Figure 23-11. Schematic symbol for a P-channel depletion MOSFET.

Enhancement Insulated Gate FETs (MOSFETs) Figure 23-12. P-channel enhancement MOSFET.

Enhancement Insulated Gate FETs (MOSFETs) Figure 23-13. Schematic symbol for a P-channel enhancement MOSFET.

Enhancement Insulated Gate FETs (MOSFETs) Figure 23-14. Properly biased P-channel enhancement MOSFET.

Enhancement Insulated Gate FETs (MOSFETs) Figure 23-15. Schematic symbol for an N-channel enhancement MOSFET.

Enhancement Insulated Gate FETs (MOSFETs) Figure 23-16. Properly biased N-channel enhancement MOSFET.

MOSFET Safety Precautions Keep the leads shorted together Wear a grounded metallic wristband Use a grounded soldering iron tip Make sure power is off

Testing FETs Commercial transistor test equipment Ohmmeter

Summary The three leads of a JFET are attached to the gate, source, and drain MOSFETs (insulated gate FETs) isolate the metal gate from the channel with a thin oxide layer Depletion mode MOSFETs are usually N-channel devices and are classified as normally on

Summary (cont’d.) Enhancement mode MOSFETs are usually P-channel devices and are normally off Electrostatic charges from fingers can damage a MOSFET JFETs and MOSFETs can be tested using a commercial transistor tester or an ohmmeter