Minggu, 01 Mei 2011

Introduction To The dB (excerpt)

The deciBel

Represent gains or attenuations logarithmically (base 10) (the Bel)

But to make numbers more convenient, scale by a factor of 10 (the deciBel or dB)

G = 10Log(P out / P in ) in dB


An amplifier has a power gain of 1000.
What is this in G = 10Log(1000) = 10 x 3 = 30 dB

An attenuator has its output power 1/10th of its input is its transfer function in dB?
G = 10Log(1/10) = 10 x -1 = -10 dB. (Note -dB can be negative)

Introduction To The dB http://bit.ly/mv7gtG


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