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求全差分运放单端输入阻抗?上拉133欧姆电阻的作用?这个电阻会影响其输入阻抗和增益吗?

源端阻抗50,输入1.255V,增益为10db,后端接ADC。有大神的话麻烦教我分析一下这个电路,如何配置的,为何这么配?跪谢!