⋆⁺₊⋆lunaland☾⁺₊⋆

Lunaland

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01 School

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Voltage Gain
$A_{v} = \frac{v _{o}}{v _{i}}$
$A_{v (d B)} = 20 l o g_{10} (∣ A_{v} ∣) dB$

Current Gain
$A_{i} = \frac{i _{o}}{i _{i}}$
$A_{i (d B)} = 20 l o g_{10} (∣ A_{I} ∣) dB$

Power Gain
Power amplifiers tend to amplify current rather than voltage
$A_{p} = \frac{P _{L}}{P _{I}} = \frac{v _{o} i _{o}}{v _{i} i _{i}} = A_{v} A_{i}$
$A_{p (d B)} = 10 l o g_{10} (∣ A_{p} ∣) dB$