The design and simulation of digital filters is supported by Matlab® and Simulink, but these tools are very expensive and require training courses. In this paper we proposed Qucs/QucsStudio as a simulations tools which is freely available. Another advantage is the schematics editor, enabling easy drawing the filter structure by connecting the blocks of delay, coefficient multiplication and signal summation.



QUCS, QucsStudio, SPICE, digital filters



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