In this work, a new versatile voltage- and transconductance-mode analog filter is proposed. The filter, without requiring resistors, employs three differential-difference transconductance amplifiers (DDTAs) and two grounded capacitors, which is suitable for integrated circuit implementation. Unlike previous works, the proposed filter topology provides: (1) high-input and low-output impedances for a voltage-mode (VM) analog filter, that is desirable in a cascade method of realizing higher order filters, and (2) high-input and high-output impedances for a transconductance-mode (TM) analog filter without any circuit modification. Moreover, a quadrature oscillator is obtained by simply adding a feedback connection. Both VM and TM filters provide five standard filtering responses such as low-pass, high-pass, band-pass, band-stop and all-pass responses into single topology. The natural frequency and the condition of oscillation can be electronically controlled. The circuit operates with 0.5 V supply voltage. It was designed and simulated in the Cadence program using 0.18 µm CMOS technology from TSMC.

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

Faculty of Electrical Engineering and Information Technology Slovak University of Technology 81219 Bratislava Slovakia

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