Low-cost parallel fir digital filter structures utilizing the coefficient symmetry

This paper proposes new low-cost and area-efficient structures for parallel finite impulse response (FIR) filter. With new polyphase decomposition methods, all the subfilters in the proposed structures contain symmetric coefficients, then every subfilter only needs half the number of multipliers. The total number of multipliers is then reduced at the expense of additional adders. It is profitable to exchange multipliers with adders, since multipliers outweigh adders in terms of hardware cost. This design is implemented with TSMC 65nm technology. Synthesized result shows that the area of the proposed 2-parallel structure is reduced by 23%, the area of the proposed 3-parallel structure is reduced by 12%, when compared to the existing FFA structures.