dB or dBm FROM R&S

toowood

【文件名】:061123@52RD_dB-dB 1MA98_4E.pdf
【格　式】:pdf
【大　小】:672K
【简　介】:
【目　录】:



介绍一些基本概念
Everything you ever wanted to know
about decibels but were afraid to ask…
Application Note 1MA98
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.