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关于INA333单电源供电时,共模电压应该怎样提供最合适

Other Parts Discussed in Thread: INA333, OPA333

下图是我设计的电路图,对INA333采用单电源供电,为了给INA333提供一个2.5V的共模电压采取了以下接法,经过调试后发现输出为零。不知道是不是电路图设计错误还是其他的原因,请大家帮忙解决一下这个问题,最好能提出电路的修改意见,万分感激!谢谢