Novel Complete Passive Equivalent Circuit Model of the Practical 4-OTA-Based Floating Inductor

Abstract

Recently, the OTA has been widely used in filter design [10]. The OTA can be used as the basis active elements for In this research, the practical 4-OTA-based floating the construction active inductors of the first category and inductor based upon the often cited monolithic CMOS yield the so called OTA-based inductor which can be both technology has been studied and its complete passive grounded and floating type. It can be seen that there are two equivalent circuit model, where the effects of both parasitic possible topologies for the floating type of the OTA-based elements and finite opened-loop bandwidth have been taken inductor which use three and four OTAs entitled the 3-into account, has been proposed. The accuracy evaluation of OTA-based and the 4-OTA-based floating inductor the proposed model has also been performed. The resulting respectively. These OTA-based-floating inductors can be model has been found to be excellently accurate with a depicted as follows. considerably very small average error. Furthermore, the further study which is the inclusion of the mismatches among OTAs in order to obtain the most accurate results 93g1 gg ' @ -has also been proposed. However, the proposed passive equivalent circuit model has been found to be a c C convenience tool for the design of any signal processing I circuits which require the CMOS-OTA-based floating inductors due to its considerably very small average error Fig. 1. 3-OTA-based floating inductor (left) and 4-OTA-based and the nature of the monolithic CMOS technology which floating inductor (right) allows the exclusion of the mismatches among OTAs.Since the active inductors of both folds have been Index Terms-Passive equivalent circuit model, found to be hard to analyze both manually and with Equivalent circuit model, OTA-based floating inductor, computer aided, the passive equivalent circuit models of OTA-based inductor, Active inductor, CMOS-OTA these active inductors which adequately and accurately model the impedance characteristics of the active inductors 1. INTRODUCTION but much far simpler to analyze have been constructed in order to simplify the circuit analysis and designing task. Active inductors have been found to be applicable in many There are many examples of theses passive equivalent signal processing circuits. These active inductors can be circuit models e.g. the one in [10] and that proposed in [11] constructed based upon the concept of inductor realization etc. It can be seen that the one proposed in [10] is belonged by the gyrator-C combination and can be classified into two to the practical OTA-based grounded inductor but with only folds. Those belong to the first category are constructed at the effect of the parasitic elements have been taken into the network level basis by using the available active account while the effect of the OTA's finite opened-loop building block as the basis active element for the gyrator bandwidth has been neglected, hence the resulting model construction and use the discrete external capacitor to has been...