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LMH6552的输入阻抗问题,怎么算的

Other Parts Discussed in Thread: LMH6552

看了LMH6552的DATASHEET,figure 47中,同相输入端那里,RG为348,为了将输入阻抗匹配成50欧姆,为什么那个电阻是56.2????56.2并上348只有48.39欧姆啊???求解