Signal Booster Types and Definitions



Class A:

  • Uses digital filters (DSP) in order to achieve narrow BW
  • Used to be defined as passing only individual channels (12.5 or 25 kHz), but recent FCC rule change relaxed it to 75 kHz
  • In order to use DSP, it has to down-convert RF signals to very low frequencies.
  • Down-conversion and narrow filtering process can result in long Group Delay times – potentially causing Time Domain Interference
  • Extra hardware means higher unit cost


Class B:

  • Relatively Simple: filters and amps
  • Typically, will use analog filters with BW between a few hundred kHz and several MHz
  • Typical gain up to 80 dB
  • Typical maximum output power 1~2 W (30~33 dBm)
  • Extremely low Group Delay Distortion and end-to-end delay: Digital system compatible
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