一种特殊数字滤波器的优化结构

An Optimized Structure for a Special Digital Filter

提出一种特殊数字滤波器的结构优化方案,可以简化滤波器结构、节省电路面积。将该方案应用于解调ISO/IEC 14443协议规定的PICC到PCD的副载波调制信号。在此基础上,改变子滤波器的位置,将长延迟链前移,减少了长延时链的数据位宽。综合结果表明,该滤波器的面积仅为传统滤波器的50%。

An optimized structure for a special digital filter was designed.The structure of filter could be simplified and the area of the circuit could be reduced effectively.It was applied to the demodulation of ISO/IEC14443 in communication between PICC and PCD.Having changed the position of the sub-filter and moved the long delay chain forward,the bit width could be reduced.Finally,according to the results of synthesis,the area of the filter was reduced by 50% compared with that of the traditional filters.