INGINERIA FILTRELOR ACTIVE RC SI ZGOMOTUL ELECTRONIC

Prof. dr. ing. Valentin GUTU (republica Moldova)

Buletinul AGIR nr. 1/2013 · Anul XVIII

Rezumat

Aceasta lucrare este dedicata analizei rezultatelor metodei de calcul si a masurarilor
experimentale a zgomotului propriu al dispozitivelor si echipamentelor electronice de selectie a semnalelor
prin frecventa – filtrele active RC, schemele Sallen-Key, Teylor si Raukh. Aceste scheme de realizare permit
obtinerea functiilor de transfer trece-sus (FTS), trece-jos (FTJ) si trece-banda (FTB). Sunt prezentate si analizate
rezultatele calculelor teoretice si a masurarilor experimentale a zgomotului propriu al elementelor filtrelor
active – amplificatoarelor operationale, este studiata influenta componentelor pasive si a factorului de
calitate ale unui etaj de filtrare de ordinul doi in schemele mentionate. Analiza confirma posibilitatea utilizarii
practice a metodei de calcul si de masurare a densitatii spectrale a zgomotului propriu si permite elaborarea
unor recomandari principial noi pentru asamblarea filtrelor active RC, cu nivel scazut de zgomot.

Cuvinte cheie: filtre active functie de transfer trece-jos trece-sus trece-banta amplificator operational zgomot propriu caracteristici de zgomot densitatea spectrala.

Abstract

This paper is dedicated to the analysis rezults of calculation method and experimental measurement
of own noise of electronic devices and equipment for signals selection by frequency - the RC active filters,
Sallen-Key, Teylor and Raukh version. This scheme allows the realization of active filters to obtain the transfer
function high-pass (HPF), low-pass (LPF) and pass-band (PBF). Are prezented and analysed the rezults of
teoretical calculations and experimental measurements of its noise active filter elements - the operational
amplifiers, is studied the influence of passive coponents and the quality factor of a second order filter floor in the
schemes mentioned. Analysis confirms the practical possibility of using the method of calculation and
measurement of its noise spectral density and allows the development of fundamentally new recomendations
for active filters assembly, with low noise.

Keywords: active filter pass-low pass-high pass-band transfer function operational amplifier own noise noise caracteristics spectral density

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