Decimation Structures for Power of Three Decimation Factors for Consumer Devices
Gordana Jovanović Doleček, Carlos Jair Santin Cruz · 2019
This paper presents a low-power non-recursive decimation structure for power of three decimation factors suitable for consumer devices. The proposed structure has an improved aliasing rejection, and decreased passband droop in comparison with the corresponding comb filter. The aliasing rejection is increased by using a modified comb filters. Similarly, the passband droop is decreased by using a compensator at a low rate. The method is illustrated with one example. The structure has k stages, each decimated by 3, where k depends on decimation factor. Each stage is composed of the cascade of combs and modified combs. The structure based on the polyphase decomposition is also presented. Some comparisons with methods from literature are also provided.