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That depends on its purpose. Some examples:

  • RF amplifier in IF stage of AM radio: 10KHz.
  • RF amplifier in TV set: 6MHz.
  • RF amplifier in IF stage of FM radio: 200KHz.
  • An RF amplifier in a military RADAR set will probably have very narrow bandwidth to reduce jamming possibility, but wide enough to allow for doppler shift of targets.
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