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提出了一种小波变换的开关电流滤波器实现的新方案,基于网络函数逼近理论,采用一种函数逼近的系统算法将基本小波函数综合为有理分式和,并利用开关电流并联结构实现该基本小波函数滤波器.以高斯一阶导数函数为例,给出了逼近网络的具体构造过程和开关电流滤波器实现结构.该滤波器网络由六个以S2I存储单元为核的双二次开关电流滤波器并联而成.理论分析和仿真结果表明,新方案比原有实现方法在逼近精度、系统稳定性、电路性能方面均有明显改善.
A new scheme of switching current filter based on wavelet transform is proposed. Based on the theory of network function approximation, a system approximation algorithm is used to synthesize the basic wavelet functions into rational fractional sum. The switch current parallel structure is used to realize the basic scheme Taking the first derivative function of Gaussian as an example, the concrete construction process of the approximation network and the structure of the switch current filter are given. The filter network consists of six bi-quadratic switching currents with S2I memory cells as the core Filter in parallel.The theoretical analysis and simulation results show that the new scheme has a significant improvement in the approximation accuracy, system stability and circuit performance than the original method.