DISCRETE-ANALOGUE FILTER ON SWITCHED CAPACITORS WITH SIGNAL ADDER MADE ON MULTIDIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2024 - IPC H03H19/00 

FIELD: radio engineering.

SUBSTANCE: invention relates to radio engineering and can be used to select given signal spectra. Result is provided by introducing into the DAF circuit a multidifferential operational amplifier with two input ports, wherein the inverting input of the first port is connected to the output of the multi-differential operational amplifier, the non-inverting input of the first port is connected to the output of the device, inverting input of second port is connected to common bus of power supplies, and non-inverting input of second port is connected to input of device, output of the multidifferential operational amplifier is connected to the inverting input of the differential operational amplifier through series-connected electronic switches, and the common unit of the second and third series-connected electronic switches is connected to the common power supply bus through the third frequency-setting capacitor.

EFFECT: creation of a discrete-analogue filter (DAF) on switched capacitors, in which the transfer coefficient at zero frequency does not depend on capacitance of capacitors and is always equal to minus one.

1 cl, 7 dwg