Filtragem digital e reconstrução de sinais em frequência intermediária usando FPGA

Abstract

This work deals with filtering and reconstruction of intermediate frequency signals using FPGA. Development and implementation of digital signal processing algorithms are performed, including the design of a printed circuit board, its assembly and the circuit testing. The dissertation presents a brief study of sampling and reconstruction of analog signals. Special attention is given to the sampling of analog band-pass signals and to the analysis of practical issues in the reconstruction of intermediate frequency signals. Two systems for signal reconstruction based on digital signal processing specifically in discrete resampling are presented and analyzed. Theories are also described for the welding and assembly processes of electronic boards in order to define a methodology for the design, assembly and soldering of electronic boards. This methodology is applied in the design and manufacture of the prototype of a digital filtering module for digital cellular repeaters. The project, implemented using FPGA, is based on the two systems mentioned above. At the end of the text, results of digital filtering and reconstruction of intermediate frequency signals using the developed prototype are presented.