是 dB 吗？
判断正误：30 dBm + 30 dBm = 60 dBm？为什么 1% 有时候表示 –40 dB，有时候又表示 0.1 dB 或 0.05 dB？有时候，即使是经验丰富的工程师也难以回答这些问题。分贝随处可见，包括功率电平、电压、反射系数、噪声系数以及场强等。什么是分贝，我们又应该如何在计算中使用分贝？本应用指南带您重温分贝相关知识。
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.
Type
教案
Version
13e
Date
Oct 21, 2019
Size
1 MB