摘要
本文主要介绍了CIC(cascad intergrator comb)抽取滤波器的两种补偿方法:升幅FIR滤波器补偿法;ISOP(Interpolated Second Order Polynomials)补偿法。本文以抽取因子为256的四级级联CIC抽取滤波器为例,详细介绍了两种补偿方法的原理和相应的模型参数求解方法,并对比了它们的补偿效果和硬件实现结构。实验表明ISOP的通带补偿效果比升幅FIR补偿更好,但是FIR补偿的阻带衰减特性更好些。
In this paper two compensation methods of CIC decimation filter are introduced, which are FIR and ISOP.Taking a four stage CIC filter with a decimation factor 256 as an example,theory of the two compensation methods and solving methods for the responding model parameters are presented,and then the compensation results and hardware implenmentation structure are compared.Experiments show the compensation result of ISOP is better than FIR in the passband,while the stop band attenuation of FIR compensation method is better.
