FIELD: radio-electronics, in particular, frequency selection means for usage as one-link filter of second order upper frequencies with transfer zero or as part of multi-link filter.
SUBSTANCE: active RC-filter contains operational amplifier 1, resistors 2-4,6,9,10, capacitors 5,7, common bus 8. At given ratio of resistances or resistors 2,3 and 10, adequate to required parameters of transfer function (frequency and quality of poles, frequency of transfer zero), it is possible to decrease native electric noises of filter by means of proportional decrease of resistances of all resistors, connected to inverting input of operational amplifier 1. Limiting decrease of resistances of aforementioned resistors is limited by allowed decrease of input resistance of filter. Still in this case minimal achievable voltage of native electric noises of filter is always less than that of known analogs during realization of same transfer function.
EFFECT: usage of minimal possible amount of operation amplifiers and frequency-setting capacitors while minimizing voltage of native electric noises.
1 dwg
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