in，limeng，zhangjin－ming （college ofinformation science and technology，beijing university of chemical technology，beijing 100029，china） abstract：acircuit which has a stricttime order and can automatically acquire data is realized by using cpld，adand fifo．this circuitsolvesthe problemofanti－aliasing filtering when therotational speed of a machineis notconstant． key words：signals acquisition in a complete sampling period；key phase signal；anti－aliasing filtering 1 整周期采样控制的实现1．1 整周期采样 整周期采样控制是由傅
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