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用开关电流技术实现小波变换的关键是实现小波滤波器,小波滤波器的传输函数可通过对小波基函数的有理逼近获得。采用高斯函数1阶导数作为基本小波,用Padé变换获得其有理分式逼近,利用开关电流技术实现小波滤波器,并得到小波变换所需的基本小波及其膨胀小波。用Cadence Spectre对该小波滤波器进行仿真,仿真结果验证了小波滤波器的良好特性。
The key to realize the wavelet transform with the switch current technology is to realize the wavelet filter. The transfer function of the wavelet filter can be obtained through the rational approximation of the wavelet basis function. The first order derivative of Gaussian function is used as the basic wavelet, and its rational fractional approximation is obtained by Padé transformation. The wavelet filter is realized by the switching current technique, and the basic wavelet and its expansion wavelet needed by the wavelet transform are obtained. The wavelet filter is simulated with Cadence Specter, and the simulation results verify the good characteristics of the wavelet filter.