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1MA98: dB or not dB?

Abstract
True or false: 30 dBm + 30 dBm = 60 dBm? Why does 1% work out to be -40 dB one time but then 0.1 dB or 0.05 dB the next time? These questions sometimes leave even experienced engineers scratching their heads. Decibels are found everywhere, including power levels, voltages, reflection coefficients, noise figures, field strengths and more. What is a decibel and how should we use it in our calculations? This Application Note is intended as a refresher on the subject of decibels.
Last Modified
01.10.2006
File NameVersionLast ModifiedFile Size
1MA98_4E.pdf
Application Note - English version
  09.10.2006   0.6 MB
1MA98_4D.pdf
Application Note - German version
  09.10.2006   0.7 MB