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关于计算运算放大器输出阻抗的问题

Other Parts Discussed in Thread: OP07

TI工程师你好!

如上图所示输入为电池电压经过OP07差分后经二级RC滤波后输入到DSP的ADC引脚。请问图中红色标记处的运放输出阻抗,也是ADC的输入阻抗。应该如何计算?十分感谢!