Electronically tunable mixed mode universal filter employing grounded capacitors utilizing highly versatile VD-DVCC
ISSN: 0305-6120
Article publication date: 16 July 2021
Issue publication date: 24 November 2022
Abstract
Purpose
This paper aims to achieve two main objectives. First, to introduce to the literature a new versatile active building block, namely, voltage differencing differential voltage current conveyor (VD-DVCC) for analog signal processing applications. Second, to design a novel electronically tunable mixed-mode universal filter. The designed filter provides low-pass, high-pass, band-pass, band-reject and all-pass responses in voltage-mode (VM), current-mode (CM), trans-impedance-mode (TIM) and trans-admittance-mode (TAM).
Design/methodology/approach
The proposed filter uses two VD-DVCCs, three resistors and two capacitors. All the capacitors used are grounded, which is advantageous from the monolithic integration point of view. The VD-DVCC is designed and validated in Cadence software using CMOS 0.18 µm process design kit from Silterra Malaysia at a supply voltage of ±1 V.
Findings
The proposed novel filter enjoys many attractive features including as follows: the ability to operate in all four modes, no requirement of capacitive matching, tunability of quality factor (Q) independent of pole frequency, availability of both inverting and non-inverting outputs for VM and TIM mode, high output impedance explicit current output for CM and TAM, no requirement for double/negative input signals (voltage/current) for response realization and low active and passive sensitivities. The filter is designed for a pole frequency of 5.305 MHz. The obtained results bear a close resemblance with the theoretical findings.
Originality/value
The proposed novel filter structure requires a minimum number of active and passive components and provides operation in all four operating modes. The filter will find application in structures of mixed-mode systems.
Keywords
Acknowledgements
Part of this work was carried out at the Institute of Microengineering and Nanoelectronics (IMEN), University Kebangsaan Malaysia (UKM). This work is funded by the Ministry of Education Malaysia under the grant (FRGS/1/2018/TK04/UKM/02/1) and AKU254:HICoE (Fasa II) “MEMS for Biomedical Devices (artificial kidney)”. The authors would also like to thank the anonymous reviewers for their insightful comments and suggestions.
Citation
Faseehuddin, M., Herencsar, N., Albrni, M.A., Shireen, S. and Sampe, J. (2022), "Electronically tunable mixed mode universal filter employing grounded capacitors utilizing highly versatile VD-DVCC", Circuit World, Vol. 48 No. 4, pp. 511-528. https://doi.org/10.1108/CW-05-2020-0080
Publisher
:Emerald Publishing Limited
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