Diodes
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This document presents an agenda for a lecture on diodes. It will introduce basic diode concepts like their composition and circuit models. It will discuss applications of diodes in circuits and different types of diodes like Zener diodes and light emitting diodes. The lecture will show real diode components and their usage. It will conclude with a summary of diodes and thank sources in a bibliography.
Diodes
- 1. Department of Electronics & Designed by Soujanya Roy, Anish Chakraborty and Raj Sekhar Goswami Communication Engineering
- 2. AGENDA Introduction to the Basic concepts of Diodes - Whats a diode? - What are diodes made out of? - Diode Circuit Models Applications of diodes in various circuits Getting into: - Types of diodes - Their uses Getting Real - Lets take a look at the real diodes - Video footage Conclusion Bibliography
- 3. Introduction- Basic Concepts Whats a diode? - Di+Ode - A semiconductor device with two terminals allowing the flow of current in one direction only.
- 4. Introduction- Basic Concepts What are diodes made out of? Silicon Germanium GaAs
- 5. Introduction- Basic Concepts What are diodes made Diamond lattice and Zinc Blende out of? Structure
- 6. Introduction- Basic Concepts Diode Circuit Models Lets Browse through the three important diode circuit models
- 7. Introduction- Basic Concepts Diode Circuit Models √ The Ideal Diode Model The diode is designed to allow current to flow in only one direction. The perfect diode would be a perfect conductor in one direction (forward bias) and a perfect insulator in the other direction (reverse bias). In many situations, using the ideal diode approximation is acceptable.
- 8. Introduction- Basic Concepts Diode Circuit Models √ The Ideal Diode with Barrier + V √ Potential This model is more accurate than the simple ideal diode model because it includes the approximate barrier potential voltage. Remember the barrier potential voltage is the voltage at which appreciable current starts to flow.
- 9. Introduction- Basic Concepts Diode Circuit Models √ The Ideal Diode with Barrier Potential & Linear + V RF √ Forward Resistance This model is the most accurate of the three. It includes a linear √ forward resistance that is calculated from the slope of the linear portion of the transconductance curve. However, this is usually not necessary since the RF (forward resistance) value is pretty constant. For low-power germanium and silicon diodes the RF value is usually in the 2 to 5 ohms range, while higher power diodes have a RF value closer to 1 ohm.
- 10. Applications- Diodes & their uses Applications of Diodes in various Circuits √ √ √ √ √ √ √
- 11. Getting into- Diodes & their uses Types of Diodes and their applications √ √ A K √ used to allow current to flow in one direction while Are Schematic Symbol for a PN Junction Diode blocking current flow in the opposite direction. P n Representative Structure for a PN Junction Diode
- 12. Getting into- Diodes & their uses Types of Diodes and their applications √ √ A K Are specifically designed to operate under reverse breakdown Schematic Symbol for a Zener √ conditions. These diodes have a very accurate and specific Diode reverse breakdown voltage.
- 13. Getting into- Diodes & their uses Types of Diodes and their applications √ √ A K Light-emitting diodes are designed with a very large bandgap so movement of carriers across their depletion region emits Schematic Symbol for a Light- √ Emitting Diode photons of light energy. Lower bandgap LEDs (Light-Emitting Diodes) emit infrared radiation, while LEDs with higher The arrows in the LED bandgap energy emit visible light. representation indicate emitted light.
- 14. Getting into- Diodes & their uses Types of Diodes and their applications √ While LEDs emit light, Photodiodes are √ sensitive to received light. They are A K constructed so their pn junction can be exposed to the outside through a clear √ window or lens. • Photoconductive Mode A K • Photovoltaic Mode Schematic Symbols for Photodiodes
- 15. Getting into- Diodes & their uses Types of Diodes and their applications √ √ √
- 16. Getting into- Diodes & their uses Types of Diodes and their applications √ √ √
- 17. Getting Real- Video footage Letstake a look at the real diodes and their application in circuitry √ √ √
- 18. Conclusion- Summing up Summing up all about diodes…!!! √ √ √ √ √
- 19. Bibliography- References Thanks to the sources…!!! √ √ √ √ √
- 20. THE END… √ √ √ √ √