ACTIVE ELECTRIC FREQUENCY-SELECTIVE DEVICE Russian patent published in 2019 - IPC H03H7/12 

FIELD: radio engineering; electronics.

SUBSTANCE: invention relates to radio electronics and can be used for frequency selection of signals in transceiving communication devices. Active electric frequency selective device comprises common bus, input and output potential terminals, as well as differential amplifier connected to its inputs by first leads first and second bipoles, second outputs of which are connected to each other and to input potential terminal, and to its outputs by the first outputs the third and fourth two-terminal devices, the second outputs of which are connected to each other and to the output potential terminal. First potential terminal of first rejection two-terminal device is connected to input potential terminal, second lead of which is connected to common bus, to the output potential terminal the first output of the second rejection two-terminal device is connected, the second output of which is connected to the common bus. Each rejection bipolar includes series-connected inductance coil, capacitor and varicap.

EFFECT: technical result consists in obtaining a low-pass filter circuit with narrow-spectrum rejection.

1 cl, 7 dwg