Electronic Devices, Floyd 8th edition

3. 3
CHAPTER 3

4. 4
Zener Diode
Works in both forward and reverse direction
In reverse direction it comes in the range of 1.8V to 100V

5. 5
Zener Diode
Zener breakdown
Typically at low reverse voltage (5V).
Breakdown characteristics
Voltage Regulation

6. 6
Light Emitting Diode
Electroluminescence
• A large exposed surface area on one layer of the
semi conductive material permits the photons to be
emitted as visible light.
Anode= +ive Cathode= -ive

7. 7
Liquid Color display (LCD)
• Combination of two states of matter – the solid and the liquid
• Advantages
• Low power consumption (uW)
• low cost
• Good contrast
• Disadvantages
• Additional requirement of light source
• a limited temperature range of operation (between 0 and
60° C)
• Low reliability
• Short operating life

8. 8

9. 9