Decibel

Logarithmic unit ratio expressing Power or Amplitude gain.

where,

  • , = Power levels
  • , = Voltage or Current amplitudes
  • 10 log for power, 20 log for voltage/current since

Units

  • decibel (dB)

Notes

  • Decibels are often expressed with respect to common reference levels
    • 0 dBV = 1 Vrms
    • 0 dBm = 1 mW
    • 0 dBc = carrier signal power