Návrh a realizace kmitočtových filtrů pro analogově číslicové převodníky

Abstract

This bachelor’s thesis deals with the design and realization of anti-aliasing filters for analog-digital converters. Its aim was to recognize various types of designs of these filters and their subsequent realization with the help of different circuit structures. The work is concentrated on active and passive filters of higher order of the low-pass filter. In its first part, the theory of analog-digital converters, ways of their function and explanation of the emergence of undesirable effects (aliasing) when sampling an input analog signal are briefly described. In the main part of the thesis there are stated general procedures for the different proposals that were then used for specific designs of anti-aliasing filters. For all variants the implementation was carried out on non-soldering test field and the resulting magnitude frequency characteristics were measured, and these are in the final chapter compared with expectations. In the final phase, one of the active filter constructions is chosen for which the design of printed circuit was then made.