CMOS implementation of scalable Morlet wavelet for application in signal processing

Implementation of Morlet wavelet using current-mode circuits is presented in CMOS technology. The circuit consists of four main building blocks: squaring circuit, exponential function generator circuit, Gaussian function generator circuit and analog multiplier circuit. The proposed structure is fully programmable in terms of standard deviation and peak gain of the Gaussian function. Therefore Morlet wavelet can be programmed to define different scaling and shifting parameters. Simulation results of the circuits are obtained by HSPICE in 0.35μm standard CMOS process. Simulated results verify the feasibility of both the wavelet realization and proposed circuits.