100.3微瓦如和何换算成db

2024-11-06 18:33:02
推荐回答(1个)
回答1:

100.3微瓦换算成db?

100.3微瓦是一个具体值,而db是表征相对值的值,

所以相对1瓦来说,100.3微瓦=10lg(100.3μW/1W)

                           =10lg(100.3*10-6)

                           =10lg100.3+10lg10-6

                           =10*2.0013+10*(-6)

                           =20.013-60

                           =-39.87db

同理,相对于5瓦来说,100.3微瓦=10lg(100.3μW/5W)

                               =10lg(20.06*10-6)

                               =10lg20.03+10lg10-6  

                               =-46.98db