This paper proposed a multifunction biquad filter topology using only single VDTA as active element. In addition, it uses one grounded resistor, two capacitors and capable of realizing trans-admittance mode low pass (LP), high pass (HP), band pass (BP), and band reject (BR) biquad filtering response, simultaneously, by the use of single voltage input signal only. Apart from this, the proposed circuit has many excellent features such as, low active and passive sensitivity, low power consumption, canonical structure and electronic tunability of pole frequency and quality factor. To justify the theoretical analysis, the proposed circuit is simulated using PSPICE in 0.18?m CMOS technology from TSMC.
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