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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 Common drain ： ウィキペディア英語版 Common drain In electronics, a common-drain amplifier, also known as a source follower, is one of three basic single-stage field effect transistor (FET) amplifier topologies, typically used as a voltage buffer. In this circuit (NMOS) the gate terminal of the transistor serves as the input, the source is the output, and the drain is ''common'' to both (input and output), hence its name. The analogous bipolar junction transistor circuit is the common-collector amplifier. This circuit is also commonly called a "stabilizer." In addition, this circuit is used to transform impedances. For example, the Thévenin resistance of a combination of a voltage follower driven by a voltage source with high Thévenin resistance is reduced to only the output resistance of the voltage follower (a small resistance). That resistance reduction makes the combination a more ideal voltage source. Conversely, a voltage follower inserted between a driving stage and a high load (i.e. a low resistance) presents an infinite resistance (low load) to the driving stage—an advantage in coupling a voltage signal to a large load. == Characteristics == At low frequencies, the source follower pictured at right has the following small signal characteristics.〔(Common Drain Amplifier or Source Follower )—Circuit analysis, low frequency, high frequency, and impedance calculations.〕 \over i_\mathrm} |$\backslash infty\backslash$ |$\backslash infty\backslash$ | |- ! Voltage gain |$\backslash over\; v\_\backslash mathrm\}$ |$\backslash frac$ |$\backslash approx\; 1$ |$(g\_m\; R\_\; =\; \backslash frac\}$ |$\backslash infty\backslash$ |$\backslash infty\backslash$ | |- ! Output impedance |$r\_\backslash mathrm\; =\; \backslash frac\}$ |$R\_\; =\; \backslash frac$ |$\backslash approx\; \backslash frac$ |$(g\_m\; R\_S\; \backslash gg\; 1)$ |} The variable ''gm'' that is not listed in the schematic is the transconductance of the device (usually given in units of siemens). 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「Common drain」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.