1. Semiconductors and Diodes
CHAPTER 9
AC Power
Semiconductors and Diodes

2. Electrical Conduction in Semiconductor Devices
Figure 9.1,2,3,4

3. A pn junction
Figure 9.5
Figure 9.5
9-1

4. Drift and diffusion currents in a pn junction
Figure 9.6
Figure 9.6
9-2

5. Forward- and reverse-biased pn junctions
Figure 9.7
Figure 9.7
9-3

6. Semiconductor diode i-v characteristic
Semiconductor diode circuit symbol
Figure 9.9
Figure 9.8
Figure 9.8, 9.9
9-4

7. The i-v characteristic of the semiconductor diode
Figure 9.10
Figure 9.10
9-5

8. Large-signal on/off diode model
Figure 9.11
Figure 9.11
9-6

9. 9-7 Circuit containing ideal diode
Circuit of Figure 9.12, assuming that the ideal diode conducts
Figure 9.12
Figure 9.13
Figure 9.12, 9.13, 9.14
Circuit of Figure 9.12, assuming that the ideal diode does not conduct
Figure 9.14
9-7

10. Figure 9.15
Figure 9.16
Figure 9.15, 9.16, 9.17
Figure 9.17
9-8

11. Ideal diode rectifier input and output voltages
Figure 9.20
Ideal diode rectifier input and output voltages
Figure 9.21
Figure 9.20, 9.21
9-9

12. Figure,24,26
Offset Diode Model
9.22

14. Superposition of load line and diode i-v curve
Figure 9.34
9-10

15. Piecewise linear diode model
Figure 9.35
Figure 9.35, 9.37
Figure 9.37
9-11

16. Full-wave rectifier
Figure 9.39
Figure 9.39
9-12

17. Full-wave bridge rectifier

18. Operation of bridge rectifier
Figure 9.42
Figure 9.42
Bridge rectifier with filter circuit
9-13

19. DC power supply 9-14 Complete model for Zener diode Figure 9.45

20. (a) A Zener diode voltage regulator; (b) simplified circuit for Zener regulator
Figure 9.49
Figure 9.49
9-15

21. Two-sided diode clipper Circuit model for the diode clipper
Figure 9.54
Figure 9.55
Figure 9.54, 9.55
9-16

22. 9-17 Equivalent circuit for the one-sided limiter (diode on)
Equivalent circuit for the one-sided limiter (diode off)
Figure 9.56
Figure 9.57
Figure 9.56, 9.57
Two-sided (ideal diode) clipper input and output voltages
Figure 9.58
9-17

23. Circuit model for the diode clipper (piecewise linear diode model)
Figure 9.59
Voltages for the diode clipper
(piecewise linear diode model)
Figure 9.60
9-18

24. The Diode Clamp
Figure 9.61, 9.62

25. Biased Diode Clamp

26. Diode Peak Detector

27. Photodiode i-v curves
Figure 9.70
Figure 9.70
9-19

28. Photodiodes Photodiode circuit symbol
Light-emitting diode circuit symbol
Light-emitting diode (LED)

29. Analysis of Light-Emitting Diode
Figure 9.74
Optocoupler or Optoisolator