小波变换开关电流电路CAD设计  

A CAD Design on Implementing Wavelet Transforms Based on Switched-Current Skills

作　　者：黄传杰[1] 王卫东[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,桂林541004

出　　处：《电子器件》2010年第2期218-221,共4页Chinese Journal of Electron Devices

基　　金：广西科学研究与技术开发计划项目资助(0731021)

摘　　要：用开关电流技术实现小波变换,关键是小波滤波器的实现;小波滤波器传输表达式可通过对小波基函数的有理逼近来获得。基于Padé逼近的方法,采用高斯函数族作为小波基函数,对所选的高斯函数进行频域的有理分式逼近来获取小波滤波器传输表达式,从数学上提出一种设计小波变换开关电流(SI)滤波器的CAD方法。结合SI的电流模信号特点,利用双二次滤波器的性质,用SI单元电路的级联结构来实现电路的灵活设计。设计举例给出了设计思路,MATLAB仿真结果显示这种方法的可行性。To implement the wavelet transforms based switched current（SI）,the keystone is the design of wavelet filter.The transfer-function of wavelet filter can be obtained by the method of rational fractional approximation from the mother wavelet function.Since the Gaussian function has been chosen as one of the mother wavelet functions,the Padé approximation can help us to obtain the rational fractional approximation for wavelet filter expression from the frequency-domain function of the Gaussian function.A proposed approach is disclosed to design SI filter for wavelet transform based upon CAD.The topological configuration of the circuit can be realized by the advantages of the current mode operation of SI circuits and the characters of bilinear filters.The process is shown through an example,and the result can justify the given way to design wavelet filter.

关 键 词：开关电流 小波变换 PADÉ逼近 高斯函数 双二次滤波器 

分 类 号：TN432[电子电信—微电子学与固体电子学]