CURRENT DIFFERENCING DIFFERENTIAL OUTPUT BUFFERED AMPLIFIER (CDDOBA) AND ITS APPLICCTIONS IN SIGNAL PROCESSING

Abstract

In the present dissertation implementation of new active building block Current differencing differential output buffer amplifier (CDDOBA) using IC AD844 has been presented. CDDOBA is a new active building block with two input p and n terminal and two output, +w and -w terminal. CDDOBA can be well thought-out as a collection of inverting and non inverting current mode and inverting and non inverting voltage mode unity-gain cells. Recent advancements in current mode signal processing and advantages of current mode signal processing over voltage mode are briefly described in the second chapter. In this dissertation detailed description of the architecture of CDDOBA and PSPICE simulation of CDDOBA realized with IC AD844 is presented. General first order filters, voltage mode amplifier and differentiator and integrator circuits have been presented as application examples in order to demonstrate the performance of the CDDOBA. The PSPICE simulation results for frequency response are incorporated to verify the theory. A new Biquad filter, employing one CDDOBA as active element and four resistors and four capacitors is proposed.