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Agile band pass filters within application of operational amplifiers


I.M. Yasinsky – Ph.D. (Eng.), Leading Research Scientist, PJSC «ONIIP». E–mail:

Within design of agile frequency selective units filters with attenuation polynomial or quasipolynomial amplitude frequency characteristics are generally applied. In addition, electric filters that allow realizing attenuation characteristics with attenuation pole terminals at specified ending frequencies provide much higher squareness of amplitude frequency characteristics. This paper considers possibilities for production of agile band pass filters of even number attenuation class within application of the operational amplifier that allow realizing filters with attenuation pole terminals position of which at the frequency axis is not limited by any conditions and inputting necessary amplification into the selection circuit simultaneously. On the basis of the theory of characteristic parameters of four terminal networks ratios, that allow determining circuit element values on the basis of specified requirements, are obtained for two circuits of agile band pass filters of the second and forth attenuation class made within application of the operational amplifier as an algebraic adder. At that the circuits contain minimal possible number of agility elements and combine functions of selection and amplification. Besides, these circuits allow making more wideband filters without any restrictions within selection of endless attenuation frequencies.
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