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Amplitude Modulation

Discussion in 'General Electronics Discussion' started by helios1, Jun 6, 2012.

  1. helios1

    helios1

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    May 9, 2012
    Which is the best choice for a carrier signal in amplitude modulation? A sine or square? and why?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,219
    1,857
    Nov 17, 2011
    A sine, of course.
    If you use any other waveform, you will create sidebands at the harmonics of the carrier frequency.
    1) you will have to filter (remove) these side bands, otherwise you will disturb other signals.
    2) you put energy into these sidebands that is lost for the main purpose, because it gets filtered (see 1).

    Using a sine as carrier gives you the most bang for the buck, so to speak.

    Harald
     
  3. helios1

    helios1

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    May 9, 2012
    Thanks Harald!
     
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