基于对数域的连续小波变换处理电路

Continuous Wavelet Transform and Processing Implementation by Log-Domain Circuits

提出了一种新型的连续小波变换处理电路。电路中采用复解调技术实现小波变换,对变换系数进行了模数转换,可以与数字处理芯片接口,实现了信号的实时处理。电路完全采用对数域电流模式实现。对电路的主要模块进行了分析,仿真结果显示电路能在低电压低功率时得到宽动态范围的运用。

A new kind of continuous wavelet transform and processing circuits is presented. In the circuit, the wavelet transform is fulfilled by demodulation process. Analog coefficients of decomposition are converted to their digital correspondences in real-time, which can be fed to DSP for further processing. All are carried out by log-domain current mode circuits. The primary circuits are analyzed, and simulations indicate the circuit can be used in a wide dynamic range at low-voltage and low-power.