FPGA Schematic Implementations and Comparison of FIR Digital Filter Structures

Abstract

In this study, we investigate the FPGA schematicimplementations of finite impulse response (FIR) digital filters forthree fundamental structures on Altera DE2-115 board withoutrequiring any other software packages such as DSP Builder andMatlab Simulink. First of all, a low pass FIR digital filter isdesigned by using Matlab filter design and analysis tool (fdatool)program. Then, the designed filter is implemented and simulatedon Matlab for a given input signal. After that, for threefundamental structures (namely direct-form, transposed directform,and symmetric direct-form) in literature, the designed filteris implemented schematically on Quartus-II software and theneach project containing different structure implementation iscompiled. Then, the digital filters implemented by each structureare simulated by University Program Vector Wave File (VWF)simulation program on Quartus-II software. Simulation resultsshow that the obtained results are the same as the ones obtainedon Matlab, which confirms that the schematic designs aresuccessfully implemented. Moreover, the implemented digitalfilters are realized and successfully tested on Altera DE2-115FPGA board. Finally, three fundamental FIR structures forvarious filter lengths from 11 to 51 are implemented to comparethem in terms of total logic elements, total registers, and totalmemory.