A new multiple-input single-output-(MISO-)-type multifunction voltage-mode universal biquadratic filter employing single voltage differencing differential input buffered amplifier (VD-DIBA), two capacitors, and one resistor are proposed. The proposed structure can realize second-order low pass, high pass, band pass, band stop, and all pass filter responses without altering the circuit topology. The proposed new filter configuration also provides the following advantageous features, not available simultaneously in any of the single active device /element-based universal biquad in realizing all the five filter functions known earlier so far: (i) no requirement of any passive component(s) matching condition or inversion of input signal(s), (ii) independent electronic control of angular frequency ( ) and bandwidth (BW), and (iii) low active and passive sensitivities. SPICE simulation results have been included using 0.35？μm TSMC technology to confirm the validity of the proposed new universal biquadratic filter configuration. 1. Introduction Several multiple-input single-output (MISO) or single-input multiple-output (SIMO) type current-mode (CM) or voltage-mode (VM) universal active filters have been described in the literature because of their flexibility and versatility for practical applications. Among these, MISO-type filters are particularly attractive because the same filter structure can be used for different filter functions. Recently, considerable attention has been devoted for the realization of VM or CM filter structures using different types of single active building block/device [1–9]. However, these filter configurations have the drawback of passive component-matching requirement(s) or inversion of input signal(s). Although the MISO-type filter configuration presented in [10] can realize all filter functions without component(s) matching or inversion of input signal(s), it employs no device (only MOSFETs, two capacitors, and two resistors). VD-DIBA is one of the new active building blocks proposed in [11] and has been used in the realization of (i) first-order all-pass filter [12], (ii) simulated inductance circuits [13], and (iii) electronically controllable sinusoidal oscillator [14]. The purpose of this paper is, therefore, to propose a new MISO-type VM universal biquad employing a single VD-DIBA, two capacitors, and a resistor to realize (by appropriate selection of input signal voltage(s)) all the five standard filter functions, namely, low pass (LP), high pass (HP), band pass (BP), band stop (BS), and all pass (AP) without any passive
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