A Method to Derate the Rate-Dependency in the Pass-Band Droop of Comb Decimators

摘要

This paper presents a method to derate the dependency on the decimation factor, M, of the pass-band droop inherent to N-th ordered comb decimators. It is achieved by cascading a symmetric 3-tap FIR filter in the integral stage of the corresponding comb decimator and choosing the coefficients only as a function of order N. The proposed derating method derived from the conventional comb decimator can be readily applied to any recently developed comb decimator and droop-compensation filter design method.