This paper presents new voltage-mode shadow filters employing a low-power multiple-input differential difference transconductance amplifier (MI-DDTA). This device provides multiple-input voltage-mode arithmetic operation capability, electronic tuning ability, high-input and low-output impedances. Therefore, the proposed shadow filters offer circuit simplicity, minimum number of active and passive elements, electronic control of the natural frequency and the quality factor, and high-input and low-output impedances. The proposed MI-DDTA can work with supply voltage of ±0.5 V and consumes 9.94 μW of power. The MI-DDTA and shadow filters have been designed and simulated with the SPICE program using 0.18 μm CMOS process parameters to validate the functionality and workability of the new circuits.

Department of Electrical Engineering Czestochowa University of Technology 42 201 Czestochowa Poland

Department of Electrical Engineering University of Defence Kounicova 65 662 10 Brno Czech Republic

Department of Microelectronics Brno University of Technology Technická 10 601 90 Brno Czech Republic

Department of Telecommunications Engineering School of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand

Faculty of Biomedical Engineering Czech Technical University Prague nám Sítná 3105 272 01 Kladno Czech Republic

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