HIGH INPUT IMPEDANCE INSENSITIVE 2ND-ORDER FILTERS IMPLEMENTED FROM CURRENT CONVEYORS

Two high input impedance second-order filters with active and passive sensitivities inferior or equal to the unit are described. Both of the m use two second generation current conveyors, with positive current t ransfer (CCII+) and four passive components. The first circuit achieve s a low-pass or high-pass transfer according to the kind of passive co mponents used. The second circuit achieves a band-pass transfer. SPICE simulation results using translinear current conveyors are given and discussed. They confirm the validity of the analysis and they point ou t the high performances of these filters. Experimental results obtaine d with the AD844 AN transimpedance operational amplifier show the adva ntage of these implementations compared to conventional ones.