基于开关电流双线性积分器的IFLF小波滤波器设计  

IFLF wavelet filters design based on switched-current bilinear integrators

作　　者：李目[1,2] 何怡刚[2] 

机构地区：[1]湖南科技大学信息与电气工程学院,湖南湘潭411201 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电路与系统学报》2013年第2期191-195,共5页Journal of Circuits and Systems

基　　金：国家杰出青年科学基金(50925727);国家自然科学基金(60876022);国防预研重大项目(C1120110004);湖南省科技计划项目(2010J4;2011JK2023);广东省教育部产学研项目(2009B090300196);"中央高校基本科研业务费"资助;湖南省教育厅科研项目(10C0672);湘潭市科技计划项目(CG2012006)

摘　　要：根据连续时间滤波器设计理论,提出了一种基于开关电流双线性积分器和IFLF结构的取样数据小波滤波器设计方法。利用麦克劳林级数逼近小波频域函数,采用开关电流双线性积分器作为基本单元设计出传递函数为频域逼近函数的IFLF结构小波滤波器。通过调节滤波器时钟频率获得任意尺度小波函数实现连续小波变换。实验结果表明了该方法设计小波滤波器具有电路结构简单,小波函数尺度易于调节,通带灵敏度低的特点。According to the theory of continuous-time filter design,a new sampled-data wavelet filter implementation based on switched-current bilinear integrator and inverse follow-the-leader feedback（IFLF） structure is presented.First,the wavelet frequency domain function is approximated by Maclaurin series.Next,the wavelet filter whose impulse response is the wavelet approximation function is designed using an IFLF structure with switched-current bilinear integrator as the main building blocks.By controlling the various clock frequencies of the filters with the same system architecture,the continuous wavelet transform can be implemented.Simulations demonstrate that the designed circuits have simple structure,easily adjustment scales of wavelet function and very low passband sensitivity.

关 键 词：双线性积分器 小波滤波器 开关电流技术 麦克劳林级数 IFLF 

分 类 号：TN713[电子电信—电路与系统]