Nullor Based New Implementation of CDBA Using Current Feedback Operational Amplifier

Abstract

In this paper, a methodology based on nullors and passive elements to create equivalent circuits for existing building blocks has been presented. This methodology has been used for generating the equivalent nullor circuit for Current Differencing Buffered Amplifier (CDBA) and its implementation through AD844 ICs of Current Feedback Operational Amplifier (CFOA) has been presented. The proposed circuit is further modified by replacing the equivalent nullor sections with smaller blocks. The implemented CDBA (proposed CDBA-I) has been simulated and compared with existing topologies of CDBA to represent its proper functioning using LTSPICE. The proposed CDBA configuration offers a symmetric structure for its 2 differential inputs and offers higher bandwidth. Moreover, the configuration has been modified further to achieve low noise output terminal by the use of another CFOA (proposed CDBA-II). Both of these proposed configurations have been simulated and verified experimentally.