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OPアンプ > 非反転増幅回路 > 抵抗比の広がりを抑制した正相増幅器

Last updated at Posted at 2015-07-28

引用: オペアンプ基礎回路再入門 by 岡山努さん

図3.5に示す方法で反転増幅器で用いた手法と同じように抵抗比の広がりを抑制することもできます。

schemeit-project.png

この回路定数で約1000倍の電圧増幅率を得ることができます。しかし、上図においては、反転増幅器とは異なり、R1の値は低くても回路の入力抵抗が低くなるなどの影響がありませんのでR3, R4を省いてR1=100Ωにしても構いません。

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