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Chapter 20

Chapter 20. PN Junction Diodes. Objectives. After completing this chapter, you will be able to: Describe what a junction diode is and how it is made Define depletion region and barrier voltage Explain the difference between forward bias and reverse bias of a diode. Objectives (cont’d.).

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Chapter 20

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  1. Chapter 20 PN Junction Diodes

  2. Objectives • After completing this chapter, you will be able to: • Describe what a junction diode is and how it is made • Define depletion region and barrier voltage • Explain the difference between forward bias and reverse bias of a diode

  3. Objectives (cont’d.) • Draw and label the schematic symbol for a diode • Describe three diode construction techniques • Identify the most common diode packages • Test diodes using an ohmmeter

  4. PN Junctions Figure 20-1. Diode formed by joining P- and N-type material to form a PN junction.

  5. PN Junctions (cont’d.) Figure 20-2. Barrier voltage as it exists across a PN junction.

  6. Diode Biasing Figure 20-3. PN junction diode with forward bias.

  7. Diode Biasing (cont’d.) Figure 20-4. PN junction diode with reverse bias.

  8. Diode Characteristics Figure 20-5. Diode schematic symbol.

  9. Diode Characteristics (cont’d.) Figure 20-6. Diode connected with forward bias.

  10. Diode Characteristics (cont’d.) Figure 20-7. Diode connected with reverse bias.

  11. Diode Construction Techniques • Types of PN junctions • Grown junction • Alloyed junction • Diffused junction

  12. Diode Construction Techniques(cont’d.) Figure 20-8. Common diode packages.

  13. Diode Construction Techniques(cont’d.) Figure 20-9. Packages for diodes.

  14. Testing PN Junction Diodes • Ohmmeter • Checks the forward-to-reverse-resistance ratio of a diode • Forward-biased diode • Low resistance • Reverse-biased diode • High resistance

  15. Summary • A junction diode is created by joining N-type and P-type materials together • The region near the junction is referred to as the depletion region • The charge at the junction creates a voltage called the barrier voltage • A diode that is forward biased conducts current

  16. Summary (cont’d.) • A diode that is reverse biased conducts only a small leakage current • Diodes can be constructed by the grown junction, alloyed junction, or diffused junction method • A diode is tested by comparing the forward to the reverse resistance with an ohmmeter

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