Amplitude Shift Keying (ASK) is a modulation technique where the amplitude of a carrier signal is varied according to the amplitude levels of a digital signal. In ASK, a digital signal of 1s and 0s is multiplied with a carrier signal, with a 1 having no effect on the carrier signal but a 0 reducing the carrier signal amplitude to zero. ASK has high efficiency and low noise interference but also high bandwidth and power consumption, making it suitable for applications like satellite links.

1. Amplitude Shift Keying (ASK)
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2. Contents
• Introduction
• Modulation
• Advantages
• Disadvantages
• Applications

3. Introduction
• ASK means Amplitude Shift Keying
• amplitude of a carrier signal is varied with respect to
amplitude levels in the digital signal.

4. Modulation
• Digital input eg:(101010) and
• Carrier signal is multiplied
• It passed to BPF

5. 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.

6. Wave form

7. Demodulation
• ASK signal is allowed to LPF
• Digital signal is reconstructed

8. Advantages
• High efficiency
• Low noise interference

9. Disadvantages
• High bandwidth
• High power consumption
• Not suitable for wireless communication

10. Application
• It is used in Satellite link