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输入端接50ohm到地是为了和信号源的阻抗匹配。
输出串联50ohm是为了提高运放的输出阻抗,pointB端50ohm到地是为了和50ohm传输线阻抗匹配。
这种结构一般是在测试的常用,通常在视频应用时需要这种架构,而普通应用一般不需要端接。