Maximally flat compensated-comb decimation filter with filter sharpening technique

This paper describes the generalized scheme to design the wideband comb-based decimation filter in an efficient multistage structure. In this design, we use the maximally flat second-order compensator and the filter sharpening technique. The resulting structure provides wideband compensation in the passband region without degrading the attenuation in the alias bands of the comb filter. Here we consider the multistage comb-based decimation filter, and each stage is compensated by particularly maximally flat second-order compensation filter. Last stage is realized by the sharpening technique and this sharpened stage will work at lower rate by the decimation factors of all previous stages. A common maximally flat second-order compensator is implemented. The polyphase decomposition is applied to non-recursive form of the comb filters which reduce the power consumption and to compare the result with higher order compensation filter.