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OPA328: 电阻选择

Part Number: OPA328

如图反向加法器,我想知道R1 R2 R3的电阻大小应该怎么选,放大比例是1他们大小应该是一样的,选的过大失调电流会不会有影响?如果选的过小呢,有什么影响?或者三个电阻都为0可以吗