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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 novel switched current circuit based on Infinite Impulse Response (IIR) digital network architecture is proposed. Combining the direct time domain method and the nonlinear least squares method, a high precision wavelet filter approximation function is constructed. By sampling discretization and standard Z transform, the wavelet approximation function is transformed into a discrete domain transfer function. Based on IIR digital network, the design of switching current 1 st and 2 st section circuit modules, in order to synthesize the wavelet filter circuit. The fifth-order Gaussian wavelet transform circuit is taken as an example to illustrate. The theoretical analysis and simulation results verify the effectiveness of the method.