Zener Limiter-Introduction to Electronic Engineering-Lecture Slides, Slides for Basic Electronics. Institute of Company Secretaries of India - ICSI
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Zener Limiter-Introduction to Electronic Engineering-Lecture Slides, Slides for Basic Electronics. Institute of Company Secretaries of India - ICSI

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This lecture was delivered by Dr. Burman Sanyal at Institute of Company Secretaries of India - ICSI for Basic Electronic Engineering course. Its main points are: Zener, Diode, Limiter, Voltage, Level, Positive, Varactor,...
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Basic Electronic Engineering

Basic Electronic Engineering

Lecture 7

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Zener Limiter

• Zener diodes can be used to limit the voltage level to desired levels

Positive Limiter

Negative Limiter

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Zener Limiter

• Two zener diodes connected together will limit both peaks

• Determine the output voltage of the zener limiting circuits

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Varactor Diodes

• Varactor is a diode operates in the reverse bias region and act as a variable capacitor

• The depletion region of the diode behave as a dielectric of the capacitor and the conducting p and n region will behave as capacitor plates

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Varactor Diodes

• Reverse voltage across the diode controls the capacitance

• Increasing reverse voltage decreases capacitance and decreasing reverse voltage increases capacitance

• Varactors are used in filters and tuning circuits

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Light Emitting Diodes

• Light emitting diodes emit light when forward biased

• The electrons in the n-region are at higher energy level

• When these electrons combine with holes at lower energy level the energy is emitted in the form of photons

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Light Emitting Diodes

• Forward voltage of LED is greater than the silicon diode and usually lie between 1.2 and 3.2 Volts

• The reverse breakdown voltage is less than the ordinary diode typically 3 to 10 Volts

• Circuit symbol of LED

• Application of LEDs include display and illumination

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Photodiode

• Photodiode is a device that allows reverse current to flow in the presence of light

• Light strikes on p-n junction from a small window generating minority carriers

• The minority carriers carry the reverse current called reverse light current

• A small leakage current present in the absence of light is called dark current

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Photodiode

• Photodiode can be used as a variable resistance controlled by light intensity

• Circuit symbol of a photodiode

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Schottky Diode

• Schottky diodes are formed by attaching a metal region with a n-region

• The voltage drop is typically 0.3 V as there is no depletion region in schottky diodes

• The metal region contains

conduction band electrons

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Schottky Diode

• When forward biased the higher energy electrons move from n-region to metal where they give up their energy rapidly

• Schottky diodes are used in fast switching and high frequency applications

• Circuit symbol of a schottky diode

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