ASK (Amplitude Shift Keying)

Definition

Amplitude Shift Keying (ASK) is a digital modulation technique where digital data is represented by variations in the amplitude of a carrier signal while maintaining constant frequency and phase.

Detailed Explanation

ASK is one of the simplest forms of digital modulation:

Working Principle

• Binary 1: Carrier wave transmitted at fixed amplitude
• Binary 0: No carrier wave or lower amplitude
• Carrier frequency remains constant

Characteristics

1. Modulation

   • Simple to implement
   • Bandwidth efficient
   • Sensitive to noise

2. Applications

   • Short-distance fiber optic links
   • Low-speed communication
   • RFID systems

Advantages & Limitations

Advantages:

• Simple implementation
• Low cost
• Bandwidth efficient

Limitations:

• Highly susceptible to noise
• Poor power efficiency
• Limited range

Notes

References