DISCRETE-ANALOGUE FILTER ON SWITCHED CAPACITORS AND 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, for example, during their analogue-to-digital conversions. Result is provided due to the additional introduction into the discrete-analogue filter (DAF) of a multidifferential operational amplifier with two input ports, wherein its output is connected to the inverting input of the differential operational amplifier through series-connected first, second, third and fourth electronic switches, common unit of the first and second series-connected electronic switches is connected to a common bus of power sources through a second frequency-setting capacitor, 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, and the common unit of the third and fourth electronic switches connected in series is connected to the common power supply bus through the fourth frequency-setting capacitor.

EFFECT: creation of a discrete-analogue filter (DAF) on switched capacitors, in which the transfer coefficient of the filter at zero frequency does not depend on the capacitances of the frequency-setting capacitors and is equal to minus one, wherein most of the capacitors are connected to a common bus by one output.

1 cl, 7 dwg