CIE A Level Physics (9702) 2019-2021

Revision Notes

20.1.3 Carrier Wave Frequency

Carrier Wave Frequency

  • A carrier wave is defined as:

A waveform that is modulated by either AM or FM before being transmitted

  • A carrier wave which has an amplitude modulated by a single audio frequency is equivalent to the carrier wave frequency together with two sideband frequencies
  • When a carrier wave is modulated in this way, further signals are created on either side of the carrier with varying frequencies
    • These are called sidebands and carry the modulation information
  • The AM sidebands are generated above and below the main carrier


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