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The power gain of an electrical network is the ratio of an output power to an input power. Unlike other signal gains, such as voltage and current gain, "power gain" may be ambiguous as the meaning of terms "input power" and "output power" is not always clear. Three important power gains are operating power gain, transducer power gain and available power gain. Note that all these definitions of power gains employ the use of average (as oppose of instantaneous) power quantities and therefore the term "average" is often suppressed, which can be confusing at occasions. ==Operating power gain== The operating power gain of a two-port network, GP, is defined as: : where *Pload is the maximum time averaged power delivered to the load, where the maximization is over the load impedance, i.e., we desire the load impedance which maximizes the time averaged power delivered to the load. *Pinput is the time averaged power entering the network If the time averaged input power depends on the load impedance, one must take the maximum of the ratio--not just the maximum of the numerator. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「power gain」の詳細全文を読む スポンサード リンク
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