UNIVERSAL ACTIVE RC-FILTER OF THE SECOND ORDER ON MULTI-DIFFERENTIAL OPERATIONAL AMPLIFIERS WITH MINIMUM QUANTITY OF PASSIVE AND ACTIVE ELEMENTS

摘要

FIELD: radio equipment.;SUBSTANCE: disclosed is an active RC-filter, in which in comparison to prototype input (1) is connected to the non-inverting input of the second port of first (5) operational amplifier (OA), inverting input of first port of first (5) OA is connected to non-inverting input of second port of third (7) OA and connected to first (2) output of low-pass filter, output of third (7) OA is connected to first (2) output of low-pass filter through first (10) resistor, output of second (6) OA is connected to third (4) output of band-pass filter through second (11) resistor, third (4) output of band-pass filter is connected to non-inverting input of second port of second (6) OA, and is also connected to third (7) OA first port inverting input and first (5) OA first port non-inverting input, output of first (5) OA is connected to inverting input of first port of second (6) OA, non-inverting input of first port of second (6) OA and non-inverting input of first port of third (7) OA are connected to common bus.;EFFECT: design of a universal filter which enables to implement a high- and low-pass filter and a band-pass filter.;1 cl, 4 dwg