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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 Friis formulas for noise ： ウィキペディア英語版 Friis formulas for noise Friis formula or Friis's formula (sometimes Friis' formula), named after Danish-American electrical engineer Harald T. Friis, refers to either of two formulas used in telecommunications engineering to calculate the signal-to-noise ratio of a multistage amplifier. One relates to noise factor while the other relates to noise temperature. ==The Friis formula for noise factor== Friis's formula is used to calculate the total noise factor of a cascade of stages, each with its own noise factor and gain (assuming that the impedances are matched at each stage). The total noise factor can then be used to calculate the total noise figure. The total noise factor is given as :$F\_\; =\; F\_1\; +\; \backslash frac\; +\; \backslash frac\; +\; \backslash frac\; +\; ...\; +\; \backslash frac\; =\; F\_\; +\; \backslash frac$ is the overall noise factor of the subsequent stages. According to the equation, the overall noise factor, $F\_$, is dominated by the noise factor of the LNA, $F\_$, if the gain is sufficiently high. (The resultant Noise Figure expressed in dB is 10 log(Noise Factor).) 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「Friis formulas for noise」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.