首先介绍了内插理论和CIC 滤波器原理,重点给出了CIC 滤波器设计方法,并分析了CIC 滤波器级联级数 和滤波器阶数的选取对通带衰减和旁瓣抑制的影响,仿真结果验证了设计方法的有效性和可行性。-First introduced the theory and CIC interpolation filter, the focus is given CIC filter design methods, and analyzes the CIC filter and filter cascadin