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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gain (electronics) ： ウィキペディア英語版 Gain (electronics) In electronics, gain is a measure of the ability of a two port circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output port by adding energy converted from some power supply to the signal. It is usually defined as the mean ratio of the signal amplitude or power at the output port to the amplitude or power at the input port.〔 It is often expressed using the logarithmic decibel (dB) units ("dB gain").〔 A gain greater than one (zero dB), that is amplification, is the defining property of an active component or circuit, while a passive circuit will have a gain of less than one.〔 The term ''gain'' alone is ambiguous, and can refer to the ratio of output to input voltage (''voltage gain''), current (''current gain'') or electric power (''power gain'').〔 In the field of audio and general purpose amplifiers, especially operational amplifiers, the term usually refers to voltage gain,〔 but in radio frequency amplifiers it usually refers to power gain. Furthermore, the term gain is also applied in systems such as sensors where the input and output have different units; in such cases the gain units must be specified, as in "5 microvolts per photon" for the responsivity of a photosensor. The "gain" of a bipolar transistor normally refers to forward current transfer ratio, either ''h''FE ("Beta", the static ratio of ''I''''c'' divided by ''I''b at some operating point), or sometimes ''h''fe (the small-signal current gain, the slope of the graph of ''I''''c'' against ''I''''b'' at a point). The gain of an electronic device or circuit generally varies with the frequency of the applied signal. Unless otherwise stated, the term refers to the gain for frequencies in the passband, the intended operating frequency range, of the equipment. The term ''gain'' has a different meaning in antenna design; antenna gain is the ratio of radiation intensity from a directional antenna to $P\_\backslash text/4\backslash pi$ (mean radiation intensity from a lossless antenna). ==Logarithmic units and decibels== 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「Gain (electronics)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.