Single VDTA-based current-mode electronically tunable multifunction filter

Abstract This paper presents an electronically tunable current-mode multifunction biquadratic filter which employs a single new active device namely voltage differencing transconductance amplifier (VDTA). The presented filter with single input and three outputs consists of only one VDTA and two grounded capacitors. It can simultaneously realize lowpass (LP), bandpass (BP) and highpass (HP) current responses with no need to impose component choice. The circuit also provides the advantage features of the use of only one active component and minimum number of passive component, and electronic controllability of its important parameter, as well as low sensitivity characteristic. The performance of the proposed filter is tested using PSPICE simulation program, and the simulation results agree well with the theoretical analysis. Keywords: Voltage Differencing Transconductance Amplifier (VDTA); Multifunction filter; Current-mode circuit

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