New Generalized Impedance Converter (GIC)-Based Two-Opamp Active RC Biquads

In this paper, two three-opamp-based active RC biquad structures based on generalized impedance converters (GIC) due to Mikhael–Bhattacharyya and Padukone–Mulawka–Ghausi are re-visited and their equivalence is pointed out. Next, a new two-opamp GIC-based biquad topology derived from them is investigated. The various configurations which can be derived from the proposed biquad topology to realize (a) tuneable pole-frequency ( ω p ) and constant bandwidth ( ω p / Q p ) or (b) constant pole frequency with tuneable pole- Q ( Q p ) are investigated. The effect of opamp finite bandwidth product B as well passive and active sensitivities are presented together with simulation results.