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In electronics, the Miller effect accounts for the increase in the equivalent input capacitance of an inverting voltage amplifier due to amplification of the effect of capacitance between the input and output terminals. The virtually increased input capacitance due to the Miller effect is given by : where is the gain of the amplifier and C is the feedback capacitance. Although the term ''Miller effect'' normally refers to capacitance, any impedance connected between the input and another node exhibiting gain can modify the amplifier input impedance via this effect. These properties of the Miller effect are generalized in the Miller theorem. The Miller capacitance due to parasitic capacitance between the output and input of active devices like transistors and vacuum tubes is a major factor limiting their gain at high frequencies. Miller capacitance was identified in 1920 in triode vacuum tubes by John Milton Miller. == History == The Miller effect was named after John Milton Miller.〔John M. Miller, "Dependence of the input impedance of a three-electrode vacuum tube upon the load in the plate circuit," ''Scientific Papers of the Bureau of Standards'', vol.15, no. 351, pages 367-385 (1920). Available on-line at: http://web.mit.edu/klund/www/papers/jmiller.pdf .〕 When Miller published his work in 1920, he was working on vacuum tube triodes; however, the same theory applies to more modern devices such as bipolar and MOS transistors. 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「Miller effect」の詳細全文を読む スポンサード リンク
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