Amplifier Power Gain

Ap = Av · Ai

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Result
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Formula

Ap = Av × Ai

Description

An amplifier’s power gain is the product of its voltage gain and its current gain. A common-emitter stage amplifies both voltage and current, giving the highest power gain of the three basic configurations. A follower has near-unity voltage gain but high current gain, while a common-base stage has high voltage gain but current gain under one.

Variables

  • Ap — Power gain
  • Av — Voltage gain (magnitude)
  • Ai — Current gain (magnitude)

Practical Notes

In decibels, power gain in dB = 10·log10(Ap). The three configurations trade voltage vs current gain but the common-emitter gives the largest overall power gain.

Related Concepts

All Discrete Amplifiers formulas →
Thermal Voltage Small-Signal Emitter Resistance Transistor Transconductance Diode Dynamic Resistance Common-Emitter Voltage Gain BJT Alpha–Beta Relationship Darlington Pair Current Gain Emitter-Follower Input Impedance

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