CCII-basednth-order current-mode filter with grounded R and C

A new current-mode reconfigurable nth-order active-RC filter structure involving second-generation current conveyor (CCII) is presented in this article. It uses all grounded resistors and capacitors that are desirable for integrated circuit implementation. The numbers of active and passive components are minimum in comparison with other CCII-based filter structures that use only grounded R and C. The proposed structure is compatible with equal C design which is well suited for integrated circuit fabrication. By using multi-output second-generation current conveyor, circuits of nth-order Butterworth and elliptic filters are derived from the proposed general structure with reduced number of CCIIs. The designed reconfigurable Butterworth filter is capable of providing low-pass, band pass, high-pass and band reject filtering functions from a single circuit. HSPICE simulations using 0.13 μm process BSIM level 53 model and ±1.5 V power supply confirm theoretical analysis. Simulated frequency response of individual sensitivity confirms the theoretical prediction of low individual sensitivity for most of the components and nearly null group sensitivity.