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In this letter, a novel scalable and modular design of direct form sequential finite impulse response (FIR) filter using microprogrammed control unit is proposed that can be efficiently realized in field programmable gate array (FPGA) or application specific integrated circuit (ASIC). The proposed design is suitable for sensor processing subsystem used in wireless sensor network (WSN) nodes. This is demonstrated by evaluating a sample 4-tap FIR filter on various FPGA platforms and ASIC technologies. The evaluation result shows good area/power efficiency and flexibility by using microprogrammed architecture for such applications.

Scalable design of microprogrammed digital FIR filter for sensor processing subsystem