On wideband minimum-phase CIC compensators

Abstract

This paper addresses the design of simple wideband compensators with minimum phase property, useful for correcting the passband droop of Cascaded Integrator-Comb (CIC) decimation filters and adequate for low-delay applications. The proposed Finite Impulse Response (FIR) compensators work at low sampling rate and use as a basic building block a very simple compensator that needs only two adders. Depending on the number of integrator-comb stages, K, they require K, K-1 or K-2 cascaded building blocks. Thus, the structure of the proposed compensators remains regular, and it is independent of the decimation factor. Compared with their linear-phase counterparts, the proposed filters achieve nearly the same magnitude response improvement with a lower computational complexity.