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Gain (electronics)
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===Power gain=== [[Power gain]], in [[decibel]]s (dB), is defined as follows: :<math>\text{gain-db}=10 \log_{10} \left(\frac{P_\text{out}}{P_\text{in}}\right)~\text{dB},</math> where <math>P_\text{in}</math> is the power applied to the input, <math>P_\text{out}</math> is the power from the output. A similar calculation can be done using a [[natural logarithm]] instead of a decimal logarithm, resulting in [[neper]]s instead of decibels: :<math>\text{gain-np} = \frac{1}{2} \ln\left(\frac{P_\text{out}}{P_\text{in}}\right)~\text{Np}.</math>
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