VOTAGE DIFFERENCING BUFFERED AMPLIFIER & ITS APPLICATIONS IN SIGNAL PROCESSING

Abstract

Contrary to the perception of signal processing community that Digital Signal Processing technique will dominate the need of Analog Signal Processing techniques; the later have remained firmly entrenched in signal processing applications. During the last two decades with rapid developments in semiconductor fabrication technologies, many active building blocks have been proposed by different research groups which can be used in typical Analog Signal Processing applications. Some of these building blocks are suitable for voltage- mode signal processing while others are suitable for current-mode/mixed mode applications. In the present work a brief survey of some of these active building blocks has been presented. One of these active building blocks namely Voltage Differencing Buffered Amplifier and its various applications have been studied in detail. A CMOS implementation of this block which uses an Operational Trans-conductance Amplifier at its input port has been used to realize amplifiers, integrators, first and second order filters and a KHN type biquad. PSpice simulations of these circuits have also been presented.