Implementing Exponentially Damped Harmonics Wavelet in Simple Second-Order OTA-C Circuit

Abstract

A simple exponentially damped harmonics (EDH) wavelet circuit based on the bulk-driven OTA-C integrators is presented in this work. Firstly, an EDH wavelet is derived, analyzed and generalized from a second-order series RLC circuit. Then the simple second-order EDH wavelet circuit is designed using the bulk-driven OTA-C integrator as the basic building block. By only adjusting the bias currents of the bulk-driven OTAs with the same structure, the different scale EDH wavelets are easily obtained for multiple scale wavelet analysis applications. Compared with other analog wavelet circuits reported before, the designed wavelet circuit is topologically simplified, which contains only four OTAs and two capacitors. The simulation results demonstrate the proposed EDH wavelet implementation approach is efficient.