FIELD: receiving-transmitting devices.
SUBSTANCE: invention relates to means of frequency selection of signals in receiving-transmitting communication devices. Filter includes two-terminal devices connected to differential amplifier, as well as inductance coils equipped with communication windings, filter includes additional input and output two-terminal circuits containing series-connected capacitor and varicap.
EFFECT: technical result is wider range of technical means of active band-pass filters.
1 cl, 3 dwg
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