Butterworthov NP filtar 4. Reda
Matej Beriša · 2020
The theme of this thesis is realization of the active low pass filter of the 4th order. Filter is given with approximation by Butterworth. Mathematical model and graphs for zero/pole assignments, amplitude-frequency characteristic, phase-frequency characteristic, time response and group delay were given from 4th order filtering function of Butterworth. Using filtering function of Butterworth, we calculated filter parameters and elements of the realization. However, as we wanted a 1kHz bandwith filter, we denorm the filter and repeat all procedures we mentioned above. To check our accuracy of the calculation, we used LTspice program. Graphs obtained in MATLAB we compared with graphs obtained in LTspice.