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It has been verified that the circuits constructed by active current-mode elements have the advantage of higher signal bandwidths, larger dynamic range, greater linearity, less power dissipation and simpler circuit structure. So, the circuits which are designed by employing the current conveyor and the current feedback amplifier have been received considerable attention recently. In addition, the differential voltage curre-nt conveyor was presented by H. O. Elwan and A. M. Soliman in 1997. This active element is a powerful building block, especially for applica-tion demanding differential or floating inputs like impedance converters and current-mode instrumentation amplifiers.We proposed two filters using the second-generation current conve-yor, which are one multifunction voltage-mode filter with one input and three outputs and one universal current-mode filter with three inputs and one output, respectively.Comparing with the published paper, the proposed circuits offer the following advantageous features: use fewer active and passive components, suit for integration and enjoy low active and passive sensitivities.Moreover, we design a serial voltage-mode or current-mode filters employing the differential voltage current conveyor. We also discuss their characteristics and feasibilities.The last, we proposed a current-mode filter with one input and three outputs using the voltage follower and current follower which are with low tracking errors.The results of experiments and simulations using the IC-AD844 or the Design Center 6.1 are obtained to confirm the theoretical predictions.
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