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    REALIZATION OF A GENERAL RESISTORLESS ACTIVE BIQUAD USING CBTA
    (WORLD SCIENTIFIC PUBL CO PTE LTD, 2012) Sagbas, Mehmet; Koksal, Muhammet
    In this paper, a general electronically tunable resistorless biquad, which realizes current ratio transfer function using current backward transconductance amplifiers is proposed. The biquad contains only two active components and two grounded capacitors, which make it convenient for production by the integrated circuit technology. The proposed biquad realizes all of the basic second order filter characteristics: low pass, high pass, band pass, band reject, and finally all pass. It is convenient for cascading with other similar biquads as well as with any two-port circuit with low impedance input to achieve higher order filter characteristics. The simulations that are performed using PSPICE simulator exhibit satisfactory results coherent with the theory.