FPGA-based FIR filters using digit-serial arithmetic

This paper describes the use of digit-serial arithmetic for compact and efficient implementations of real-time DSP applications on field programmable gate arrays (FPGAs). As an example, the implementation of a digit-serial 5-tap FIR filter on a Xilinx XC4010 FPGA is considered. An analysis of the performance comparison of several FIR filters is described. The results show that digit-serial designs with a digit-size of 2 bits have about 17% smaller area-time product than those of a bit-serial implementations