Amplitude Modulation

• Linear Amplitude Modulation
  Amplitude Modulation---Total Carrier (AM-TC)
  • AM-TC Description
  • Test Tone
  • Carrier Power
  • AM-TC Bandwidth

AM-TC Description

 

where

so that min and

is the modulation index. The modulation index must satisfy for no distortion.

 

Test Tone

Let .

  

Carrier Power

The efficiency is defined as the percentage of the total carrier power that conveys information. Only the sidebands convey information. Thus,

so that the carrier power is

Clearly .

AM-TC Bandwidth

The carrier spectrum of AM-TC is identical to that of DSB except for the impulse at which represents the carrier. Thus