Electronics Principles V11

Clive W. Humphris

AC POWER: Amplifier Power Gain/Loss.  

A power amplifier is designed to supply energy to an external load which is usually of a low impedance and therefore requires a power supply which is able to deliver sufficient current to meet this demand.

Power gain or loss is measured in decibels, which is a logarithmic ratio. It is useful to remember that ± 3dB is a doubling or halving of power.

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