Versatile Voltage-Mode Multifunction Biquadratic Filter Employing Only Eight Single-Ended OTAs and Two Grounded Capacitors

This paper presents a new versatile multifunction voltage-mode biquadratic filter with three inputs and four outputs employing single-ended operational transconductance amplifiers (OTAs) and grounded capacitors. The proposed circuit provides the following advantages: (i) employment single-ended OTA and grounded capacitor which is highly suitable for integrated circuit implementation, (ii) simultaneously realize voltage-mode low-pass, band-pass, highpass, band-stop and all-pass filter responses by appropriately connecting the input and output terminals, (iii) no need to employ inverting-type input signals and component-matching condition for realizing these filter responses, (iv) orthogonal set the natural frequency and the quality factor, (v) electronic control the natural frequency, (vi) low active and passive sensitivities. The workability of the proposed filter is confirmed by PSPICE simulator. From simulation results, it can be expressed that the proposed circuit agrees well with theory.