<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper presents novel solution of a fractional-order low-pass filter (FLPF). The proposed filter operates in the current mode and it is designed using third-order inverse follow-the-leader feedback topology and operational transconductance amplifiers (OTAs), adjustable current amplifiers (ACAs), auxiliary multiple-output current follower (MO-CF) as simple active elements. The filter offers the beneficial ability of the electronic control of its order and also the pole frequency thanks to electronically controlled internal parameters of OTAs and ACAs. As an example, five particular values of fractional order of the FLPF were chosen and parameters of the filter were calculated. Similarly, also electronic control of the pole frequency of the filter was studied. The design correctness and proper function of the filter are supported by simulations with CMOS models and also by experimental laboratory measurements. Comparison of the simulation results of the proposed filter for two different approximations of the parameter <italic>s</italic><sup><italic>α</italic></sup> is also included.</p></abstract>

This paper presents novel solution of a fractional-order low-pass filter (FLPF). The proposed filter operates in the current mode and it is designed using third-order inverse follow-the-leader feedback topology and operational transconductance amplifiers (OTAs), adjustable current amplifiers (ACAs), auxiliary multiple-output current follower (MO-CF) as simple active elements. The filter offers the beneficial ability of the electronic control of its order and also the pole frequency thanks to electronically controlled internal parameters of OTAs and ACAs. As an example, five particular values of fractional order of the FLPF were chosen and parameters of the filter were calculated. Similarly, also electronic control of the pole frequency of the filter was studied. The design correctness and proper function of the filter are supported by simulations with CMOS models and also by experimental laboratory measurements. Comparison of the simulation results of the proposed filter for two different approximations of the parameter sα is also included.

Fractional-order low-pass filter with electronic tunability of its order and pole frequency

Department of Telecommunications, Faculty of Electrical Engineering and Communication

Department of Radio Electronics, Faculty of Electrical Engineering and Communication

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

This paper presents novel solution of a fractional-order low-pass filter (FLPF). The proposed filter operates in the current mode and it is designed using...

Fractional-order low-pass filter with electronic tunability of its order and pole frequency

Published Online: Mar 07, 2018

Page range: 3 - 13

Received: Sep 28, 2017

DOI: https://doi.org/10.1515/jee-2018-0001

Keywords
adjustable current amplifier, current mode, electronically tunable, fractional-order, FLPF, low-pass filter, operational transconductance amplifier

© 2018 Lukas Langhammer et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Fractional-order low-pass filter with electronic tunability of its order and pole frequency

Published Online: Mar 07, 2018

Page range: 3 - 13

Received: Sep 28, 2017

DOI: https://doi.org/10.1515/jee-2018-0001

Keywordsadjustable current amplifier, current mode, electronically tunable, fractional-order, FLPF, low-pass filter, operational transconductance amplifier

© 2018 Lukas Langhammer et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
adjustable current amplifier, current mode, electronically tunable, fractional-order, FLPF, low-pass filter, operational transconductance amplifier