基于IIR数字网络的开关电流电路小波变换方法  

A Method for Wavelet Transform Using Switched-Current Circuits Based on IIR Digital Network Theory

作　　者：童耀南[1,2] 何怡刚[2] 龙英[2] 

机构地区：[1]湖南理工学院信息与通信工程学院,湖南岳阳414006 [2]合肥工业大学电气与自动化学院,合肥230009

出　　处：《微电子学》2016年第3期369-374,378,共7页Microelectronics

基　　金：国家杰出青年科学基金资助项目(50925727);国家自然科学基金资助项目(61201108);湖南省科技计划项目(2013GK3096);湖南理工学院科研项目(2012Y27)

摘　　要：提出了一种基于无限冲激响应(IIR)数字网络结构的开关电流电路小波变换方法。结合时域直接法和非线性最小二乘法,构造高精度小波滤波器逼近函数。通过采样离散化和标准Z变换,将小波逼近函数转换成离散域传递函数。基于IIR数字网络,设计开关电流1阶节和2阶节电路模块,以此综合小波滤波器电路。以5阶高斯小波变换电路为例进行说明,理论分析和仿真结果验证了方法的有效性。A method for wavelet transform using switched-current circuits was proposed on the base of infinite impulse response （IIR） digital network structure. The time-domain direct method was combined with the nonlinear least-square method to construct a high precision approximation function of wavelet filter. By using the discrete sampling and standard Z-transforming, the obtained approximate wavelet filter＇s impulse response was transformed to a Z-domain transfer function. Based on the IIR digital network structure, the first-order and second-order section circuits were designed for synthesizing the wavelet filter circuit. As an example, the fifth order Gaussian wavelet base circuit was designed to illustrate the proposed method. Theoretical analysis and simulation results showed that the proposed scheme was effective.

关 键 词：开关电流电路 小波变换 小波滤波器 滤波器逼近 IIR数字网络 

分 类 号：TN929.52[电子电信—通信与信息系统]