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利用OPA861的一些问题

下面是我搭的一个电路,我只是想将电压转换为电流,B端输入阻抗很大,并连一个50欧的电阻,输入阻抗差不多是50欧了吧?还有出来的电流经过电容和直流电耦合在一起的电路设计是没问题的?