Gain

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 The output voltage of a device divided by its input voltage. Most passive devices have a negative voltage gain, and most active devices, especially amplifiers, have a positive voltage gain. Usually expressed in dBindB, this is correct only if the input and output impedances are the same, a condition not usually met. The square of a voltage ratio is a power ratio if the condition of matched impedances is met. See amplifier gainimpedance-matching.

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