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Analog Integrated Circuits and Signal Processing

, Volume 74, Issue 1, pp 129–139 | Cite as

Adjustable band-pass filter with current active elements: two fully-differential and single-ended solutions

  • Jan Jerabek
  • Jaroslav Koton
  • Roman Sotner
  • Kamil Vrba
Article

Abstract

Four adjustable band-pass filtering solutions are presented and also compared in this paper. Two of them are suitable for single-ended signal processing and the other two are their fully-differential equivalents. Filters are built with two types of active elements. First is a simple current follower with multiple outputs and second is a current amplifier with adjustable current gain that is used to control the quality factor of each of filters. Dependency between gain and quality factor is direct in two cases or inverse in other cases and that is why the range of adjustability varies. Simulations with CMOS-transistor structures are included. Values of quality factor obtained for each of solutions are assessed.

Keywords

Current-mode Current follower Current amplifier DACA Fully differential Single ended 

Notes

Acknowledgments

Authors would like to thank referees for the detailed reviews and hints that helped to improve this paper. Authors would also like to thank Editor for choosing this paper for this Special Issue. The research described in this paper was supported by Czech Science Foundation, project No. 102/09/1681, and by project No. CZ.1.07/2.3.00/20.0007 (WICOMT) that is financed by European Social Fund and Ministry of Education, Youth and Sports of Czech Republic.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Jan Jerabek
    • 1
  • Jaroslav Koton
    • 1
  • Roman Sotner
    • 2
  • Kamil Vrba
    • 1
  1. 1.Department of Telecommunications, Faculty of Electrical Engineering and CommunicationBrno University of TechnologyBrnoCzech Republic
  2. 2.Department of Radio Electronics, Faculty of Electrical Engineering and CommunicationBrno University of TechnologyBrnoCzech Republic

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