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OPアンプ > 反転増幅回路 > R3 = (R1とR2の並列抵抗値)

Last updated at Posted at 2015-07-20

参考: オペアンプ基礎回路再入門 by 岡山努さん > 2.4

schemeit-project.png

(3)バイアス電流の補償法
オペアンプA1の+入力端子と-入力端子に流れるバイアス電流が完全に等しければ、R3 = (R1とR2の並列抵抗値)とすることでバイアス電流の影響を消去できます。

R3の値についてはいくつかの本や雑誌で「R1とR2の並列抵抗値がいい」と書いてあった。

しかしながら「何故」なのか回路の計算からはまだ理解できていない。

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