diodesSAMUEL NINO DAVID.SB.TECH (ECE) II YEAR115012013905

SEMICONDUCTOR DIODES

The symbol used for a semiconductor diode in a circuit diagram specifies the type of diode. There are alternative symbols for some types of diodes, though the differences are minor.

The triangle in the symbols points to the forward direction.

metal migrates into the semiconductor3

POINT-CONTACT DIODE

4 The 1N34 germanium version is still used

2 Metal wire is placed in contact

1 its construction is simpler

P-N JUNCTION DIODE

1 It is made of a crystal of semiconductor

2

3

4 no charge carriers are present

5 The junction does not allow the flow of electrons

germanium and gallium arsenide are used

Impurities are added to it to create a region

TYPES OF SEMICONDUCTOR DIODES

It consist of thin sharpened wire

Cat's whisker diodes were also called

as diodes

Crystal diode

These are type of point-contact diode

Tunnel diode

Region of operation showing negative resistance

It is caused by quantum tunneling

They are used in spacecraft.

Electronic symbols of diodes

Diode Light emitting diode

Photo diode Schottky diode

APPLICATIONS

•Radio demodulation•Power conversion

•Over-voltage protection•Ionizing radiation detectors•Temperature measurements

•Current steering•Waveform clipper and clamper

RELATED DEVICES OF OPTICAL DIODES

OPTICAL DIODE

Rectifier

Transistor

Thyristor DIAC

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Components of Diode

•P-Type semiconductor•N-Type semiconductor

DIFFERENT SYMBOLS OF SCHOTTKY DIODES

SCHOTTKY BARRIER DIODE

SCHOTTKY DIODE

RADIO DEMODULATION

A simple demodulator circuit

POWER CONVERSION AC TO DC POWER SUPPLY

Rectifiers are constructed from diodes

1Ex: Automotive Alternators2

Provides better performance than commutator or dynamo

3

Thank you slide

Samuel nino david