Decibels

• Attenuation = Log10

Pin

Pout

• Example 1: Pin = 10 mW, Pout=5 mWAttenuation = 10 log 10 (10/5) = 10 log 10 2 = 3 dB

• Example 2: S/N = 30 dB => 10 Log 10 S/N = 30, or,

Log 10 S/N = 3.

S/N = 103

Bel

Pin

Pout

deciBel

• Attenuation = 10 Log10

Since P=V2/R

Previous slide

Next slide

Back to first slide

View graphic version