Wide-band CIC compensators based on amplitude transformation

Abstract

This paper presents an efficient design of lowcomplexity wide-band compensators to improve the passband characteristic of Cascaded Integrator Comb (CIC) filters. The proposed compensators are designed using the amplitude transformation method recently presented in a companion paper. This work also provides a simple formula to obtain the coefficients of the compensator. Design examples and comparisons were addressed to show that the proposed compensation filters have better frequency characteristics compared to other wide-band compensators recently presented in the literature.

Efficient wide‐band droop compensation for CIC filters: ad hoc and reconfigurable FIR architectures

“…This droop is particularly undesirable in the wide-band scenario, and thus the improvement of the passband magnitude characteristic of CIC filters for this case has been recently investigated in [3,4], where lowcomplexity multiplier-less designs have been developed (the previous research on the subject was addressed in [5][6][7], among others, where multipliers are avoided due to their undesirably high computational and implementation costs [8]). We pointed out in our preliminary work [3] that with a fourth-order compensator it is possible to achieve nearly four times better droop compensation with less than twice the computational complexity of the recent second-order compensators available in the literature. However, that work presented nonreconfigurable finite impulse response (FIR) architectures derived from a heuristic design method to find the multiplier-less coefficients.…”

“…1 shows the corresponding architecture for N = 4 (the other architectures can be easily obtained from Table 1). g(0) = 2 5 -x 1 g(1) = -(2 7 + 2 3 x 2 ) g(2) = 2 9 + 2 5 -2x 2…”