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AMC1306M25: sinc3滤波器三次采样后数据比实际值小

Part Number: AMC1306M25

现在用AMC1306M25采集电机相电流。用FPGA生成的SIN3滤波器来采集数据。如果SINC3滤波器处于连续工作状态下是数据采样正常。但是如果用刷新式SINC3滤波器,采集三次之后数据要比实际值小。这个怎么回事?