According to the basic theory of iir filters , a scheme of hardware implementation is worked out combining with the fact that coefficients of numerator and denominator of transfer function are fixed and the structural feature of selected hdpld . from the clew of implementing a stratified ， modularized and parameterized design ， the thesis describes the hardware implementation of the iir filter with vhdl and schematic diagram design method . two examples that are iir notch filter and iir low - pass filter are given ， the stability of filters and the effects of quantification of coefficient are also analyzed 以iir数字滤波器的基本理论为依据，结合滤波器的传递函数分子、分母系数固定这一事实和选用的高密度可编程逻辑器件的特点，确定了iir数字滤波器的硬件实现方案；按照层次化、模块化、参数化的设计思路，采用vhdl硬件描述语言和原理图两种设计技术进行了iir滤波器的硬件设计；本文给出了iir陷波滤波器和低通滤波器两个设计实例，对设计的滤波器都进行了稳定性分析和系数量化影响分析；最终将完成的iir滤波器的硬件设计配置到芯片中，并在制作的实验电路中进行了实际滤波效果测试。
First of all , this article reviewed and analyzed the recent conditions and the reasons leading to the low capital adequacy ratio of our commercial banks . because the “ numerator strategy ” , the headquarters enlarge the capital , testify that it is useless in improving the capital adequacy ratio in practice , the capital adequacy ratio is still descending 本文先分析了我国商业银行资本充足率普遍较低的现状和原因,由于“分子战略” ,即总行层面单纯的资本运作,通过各种渠道扩充核心资本和附属资本,在我国的各种实践表明仍无法力挽狂澜,各商业银行的资本充足率水平还在下降。
