Abstract—This paper presents a new electronically tunable voltage-mode universal biquad filter based on simple CMOS operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed filter provides second-order lowpass, bandpass and highpass voltage responses at a high impedance input terminal, which enable easy cascadability. The circuit enjoys realization using a low number of active and passive components, no requirement with the component choice conditions to realize all filtering functions, and low active and passive sensitivities performance. The performances of the proposed filter are simulated with PSPICE to confirm the presented configuration.

Index Terms—voltage-mode filter, electronically tunable,operational transconsconductance amplifier, CMOS

Montree Kumngern is with Faculty of Engineering, King Mongkut’sInstitute of Technology Ladkrabang, Bangkok 10520, Thailand (e-mail:kkmontre@kmitl.ac.th).

Cite: Montree Kumngern, "New Electronically Tunable Voltage-Mode Lowpass, Highpass, Bandpass Filter Using Simple OTAs," International Journal of Computer and Electrical Engineering vol. 3, no. 5, pp. 649-653, 2011.