Realization of Band-pass Filter with 2 Amplifiers

Realiziran je Butterworthov pojasno-propusni filtar 4. reda s 2 operacijska pojačala. Analizirane su frekvencijske karakteristike i vremenski odzivi za normiranu prijenosnu funkciju filtra. Iste analize provedene su i sa prijenosnom funkcijom koja je denormirana na graničnu frekvenciju od 4kHz. Raspisivanjem jednadžbi čvorova za filtar i usporedbom raspisanih jednadžbi s vrijednostima koeficijenata normirane prijenosne funkcije definirane su normirane i denormirane vrijednosti komponenti filtra. Provedena je simulacija modela filtra s izračunatim denormiranim vrijednostima komponenti koja potvrđuje ispravnost provedenih proračuna. Izrađen je nacrt tiskane pločice realiziranog filtra.A fourth-order Butterworth bandpass filter with two operational amplifiers was realised. Frequency characteristics and time responses were analyzed for the normalized transfer function of the filter. The same analyses were conducted with the transfer function that was denormalized to the cutoff frequency of 4kHz. By writing the equations of nodes and comparing the written equations with the values of the coefficients of the normalized transfer function the normalized and denormalized values of the filter components were defined. A simulation of the filter model wih the calculated denormalized component values which confirmed the correctness of the conducted calculations was done. A printed circuit bord design was produced for the ralised filter