DISCRETE-ANALOGUE SECOND-ORDER FILTER ON THREE SWITCHED CAPACITORS WITH THREE-PHASE CONTROL Russian patent published in 2024 - IPC H03H19/00 

FIELD: radio engineering.

SUBSTANCE: disclosed is a discrete-analogue filter, the circuit of which includes multidifferential operational amplifier (12), the inverting input of the first port of which is connected to the output of multidifferential operational amplifier (12), non-inverting input of the first port is connected to output (2) of the device, the inverting input of the second port is connected to the common power supply bus, and the non-inverting input of the second port is connected to input (1) of the device, output of multidifferential operational amplifier (12) is connected to inverting (4) input of differential operational amplifier (3) through series-connected first (7) and second (8) electronic switches, common unit of which is connected to common bus of power sources through second (10) frequency-setting capacitor, besides, the common unit of first (7) and second (8) electronic switches is connected to the common power supply bus through third (9) electronic switch and third (11) frequency-setting capacitor connected in series.

EFFECT: simplifying the circuit and providing the possibility of single-element frequency tuning.

1 cl, 7 dwg