Optimum cascade realization of higher-order RC-active multi-loop filter structures

The design of a class of canonical multi-loop feedback RC-active filters that has received considerable attention in the literature is considered. The favourable features of the structure aro reviewed, but it is shown that practical considerations preclude the realization, theoretically possible, of high-order structures. The present contribution examines the possibility of medium-order cascade realizations of higher-order filters and it is established that practical filters can be obtained by this means. General design guidelines are presented to assist in the optimum partitioning of filters of this class.