Supliment: 50 scheme electronice si montaje practice
Fata de filtrele pasive, filtrele active nu utilizeaza inductante, lucru ce duce la urmatoarele avantaje:
– dimensiune micii, ceea ce permite realizarea lor sub forma unui integrat hibrid;
– reglarea unui filtru activ este mult mai usoara decat a unui filtru pasiv;
– absenta inductantelor elimind problema cuplajelor parazite;
– sunt stabile la variatii mari de temperatura;
– se obtine o amplificare a semnalului.
Inseriind doua filtre, unul trece-sus cu banda de trecere peste 300Hz si altul trece-jos cu banda de trecere de 2700Hz (fig. 1) se obtine o caracteristici similarl celei din figura 2. Nelinearitatea in zona de trecere este sub 0,5dB. In cazul alegerii unui raport R1/R2<2/9, respective C1/C2<2/9 se obtine o caracteristica similara celei din figura 3. Cele doua supracresteri din marginile benzii se intind pe o portiune de (4.3 … 4.4%)×ω0.
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