FOURTH-ORDER BROADBAND BANDPASS FILTER WITH SINGLE INPUT AND PARAPHASE OUTPUT Russian patent published in 2021 - IPC H03H11/12 

FIELD: radio engineering and communication.

SUBSTANCE: invention relates to radio engineering and communication; it can be used as an interface for limiting the spectrum of a signal source, for example, during its further processing by analog-to-digital converters of various modifications. The filter contains input (1) of the device connected to signal source (2), first (3) and second (4) outputs of the device, output operational amplifier (5). The inverting output of output operational amplifier (5) is connected to first output (3) of the device. The non-inverting output of output operational amplifier (5) is connected to second output (4) of the device. The non-inverting input of output operational amplifier (5) is connected to first output (3) of the device via series-connected first (6), second (7) and third (8) resistors. The non-inverting input of output operational amplifier (5) is connected to first output (3) of the device via first capacitor (9). The common node of first (6) and second (7) resistors is connected to second output (4) of the device via second capacitor (10). The inverting input of output operational amplifier (5) and signal source (2) are matched to the common bus of power supply (11). The filter also contains third capacitor (12) and fourth resistor (13). Additional capacitor (14) is introduced into the device circuit, and input (1) of the device is connected to the common node of second (7) and third (8) resistors through a series-connected additional capacitor (14) and third (12) capacitor. The common node of additional capacitor (14) and third capacitor (12) is connected to second output (4) of the device through fourth resistor (13).

EFFECT: providing an extended frequency range of a fourth-order bandpass active filter with a non-differential input and a paraphase output.

1 cl, 3 dwg