Amplitude Shift Keying (ASK)

Prepared BY S.MOHAN

ECE-III

Sri Shanmugha College Of Engineering & Technology

SALEM

Contents

• Introduction

• Modulation

• Advantages

• Disadvantages

• Applications

Introduction

• ASK means Amplitude Shift Keying

• amplitude of a carrier signal is varied with respect to amplitude levels in the digital signal.

Modulation

• Digital input eg:(101010) and

• Carrier signal is multiplied

• It passed to BPF

Modulation

• a digital signal is at “1” it could not affect the signal

• when a digital signal is at “0” the signal goes to zero.

Wave form

Demodulation

• ASK signal is allowed to LPF

• Digital signal is reconstructed

Advantages

• High efficiency

• Low noise interference

Disadvantages

• High bandwidth

• High power consumption

• Not suitable for wireless communication

Application

• It is used in Satellite link

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