一种高精度∑-△A/D转换器的数字滤波器设计

A Design of Digital Filter Inhigh-Precision ∑-△A/D Converter for Audio Applications

摘要: 设计了一种用于高精度音频∑-△A/D转换器的数字滤波器.该滤波器由级联梳状滤波器(CIC)、补偿滤波器和半带滤波器组成.设计中采用了乘法器分时复用技术以减少电路面积.设计的滤波器可实现128/64两种抽取率,其性能可满足该∑-△A/D转换器的要求.

Abstract: A digital filter in high--precision ∑-△A/D converter for audio applications was designed. The filter is composed of a cascaded--integrator--comb(CIC) filter, a compensation filter and a halfband filter. Time division multiplex technology is used for multipliers to reduce circuit area. The filter supports 128 or 64--time decimation and its performance can satisfy the requirement of the ∑-△A/D converter.