Universal voltage-mode biquad filter using voltage differencing transconductance amplifier

Abstract

A new voltage mode multi input single output (MISO) type biquad is proposed. The proposed configuration employs one voltage differencing transconductance amplifier (VDTA) as the active element, two capacitors and a grounded resistor. The configuration realizes all five filter functions [i.e. Low Pass (LP), High Pass (HP), Band Pass (BP), Notch (BR) and All Pass (AP)] without any matching condition. The natural frequency (ω₀) and bandwidth (BW) are independently tunable. The workability of proposed configuration has been verified using SPICE simulation with TSMC CMOS 0.18μm process parameters.