CFOA-based mixed-mode first-order universal filter implemented with commercially available ICs

Natchanai Roongmuanpha; Piyamon Earpin; Pratya Mongkolwai; Worapong Tangsrirat

doi:10.2478/jee-2026-0047

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CFOA-based mixed-mode first-order universal filter implemented with commercially available ICs

Journal of Electrical Engineering

Volume 77 (2026): Issue 5 (October 2026)

By: Natchanai Roongmuanpha, Piyamon Earpin, Pratya Mongkolwai and Worapong Tangsrirat

Open Access

|Oct 2026

Abstract

This paper introduces a mixed-mode first-order universal filter, which is implemented using commercially available integrated circuits. The proposed filter comprises three current feedback operational amplifiers (CFOAs) as commercially available ICs, along with three resistors and one capacitor as passive components. The three standard responses of a first-order filter, i.e., lowpass, highpass, and allpass responses, can be accomplished simultaneously with a single proposed structure. Additionally, it can operate in all four modes of operation, including voltage mode, transadmittance mode, current mode, and transimpedance mode. The circuit enables pole-frequency tunability through a single resistor. A non-ideal analysis considering the CFOA tracking errors and parasitic elements was also investigated. A simple application of the proposed filter for implementing a quadrature oscillator is suggested. To confirm the performance of the filter, the simulation results using PSPICE software were performed.

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Articles in this issue

DOI: https://doi.org/10.2478/jee-2026-0047 | Journal eISSN: 1339-309X (formerly 1335-3632) | Journal ISSN: 1335-3632

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Language: English

Page range: 489 - 500

Submitted on: Jun 22, 2026

Published online: Oct 11, 2026

Published in print: Oct 1, 2026

Published by: Slovak University of Technology in Bratislava

In partnership with: Paradigm Publishing Services

Keywords:

current feedback operational amplifier (CFOA),

mixed-mode circuit,

first-order filter,

commercially available IC,

quadrature oscillator (QO)

Related subjects:

Engineering,

Introductions and overviews,

Engineering, other

© 2026 Natchanai Roongmuanpha, Piyamon Earpin, Pratya Mongkolwai, Worapong Tangsrirat, published by Slovak University of Technology in Bratislava
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 77 (2026): Issue 5 (October 2026)