Pseudo-Differential Filter Design Using Novel Adjustable Floating Inductance Simulator with Electronically Controllable Current Conveyors

Roman Sotner,Jaroslav Koton,Tomas Dostal,Jan Jerabek,Norbert Herencsar,Aslihan Kartci

doi:10.5755/j01.eie.23.2.17996

Abstract

This paper presents new floating inductance simulator based on three electronically controllable current conveyors (ECCIIs) and differential voltage buffer (DVB). The inductance simulator offers simple electronic control of inductance value as well as simple control of losses by change of parameters of active elements. Based on this floating inductance simulator, example of reconnection-less reconfigurable pseudo-differential first-order filter, allowing change of transfer function between high-pass and inverting all-pass response, is discussed and studied. Moreover, the proposed structure can be easily extended to a pseudo-differential second-order band-bass filter. Behaviour of presented solutions is verified by PSpice simulations and also experimentally in frequency band up to 10 MHz. Obtained results confirmed expected features.DOI: http://dx.doi.org/10.5755/j01.eie.23.2.17996

Highlights

Fully-differential circuits have many applications due to specific features they offer, i.e. attenuation of common-mode noise as well as better rejection of signals incoming from power supply sources and possibly better dynamics in comparison to single-ended circuitries [1]–[4]
The easiest example of inverting all-pass response is available for R = RL_int, B1 = B2 = B1,2 = 1, B3 = 3, from (3) we obtained simplified form of transfer
In accordance to the state-of-the-art discussed in Table I, the first application example of the designed special inductance implementation represents unique device, because up to nowdifferential-mode reconfigurable filters have not been widely investigated

Summary

INTRODUCTION

Fully-differential (symmetrical) circuits have many applications due to specific features they offer, i.e. attenuation of common-mode noise as well as better rejection of signals incoming from power supply sources and possibly better dynamics in comparison to single-ended circuitries [1]–[4]. In this paper we are introducing a novel solution of floating inductance simulator allowing features not reported in previous works. These features are beneficial especially in electronic reconfiguration of transfer function and electronic control of pseudo-differential-mode filter parameters. Many of these have multifunctional features, features such as reconnection-less reconfigurability (possible to obtain various transfer responses without change of input/output terminal) were studied only in single-ended filtering solutions (see for example [15]). To the best of authors’ knowledge, circuits allowing reconfiguration of transfer responses, i.e. certain multi-functionality of the filter between at least two different types of fully-differential or pseudo-differential filters were not reported in the open literature yet. Theoretical expectations are supported by simulation results and by laboratory experiments

DESCRIPTION OF FLOATING INDUCTANCE SIMULATOR

Pseudo-Differential-Mode Second-Order Band-Pass Filter

B2 C

OF RESULTS

CONCLUSIONS