DISCRETE-ANALOGUE FILTER ON SWITCHED CAPACITORS Russian patent published in 2024 - IPC H03H19/00 H03H11/12 H03H17/04 

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. Discrete-analogue filter on switched capacitors additionally contains multidifferential operational amplifier (15) with two input ports. Inverting input (16) of the first port of multidifferential operational amplifier (15) is connected to its output. Non-inverting input (17) of the first port of multidifferential operational amplifier (15) is connected to output (2) of the device. Inverting input (18) of the second port of multidifferential operational amplifier (15) is connected to a common power supply bus. Non-inverting input (19) of the second port of multidifferential operational amplifier (15) is connected to input (1) of the device. Output of multidifferential operational amplifier (15) is connected to the input of voltage follower (14) through series-connected first (7) and second (8) electronic switches. Common unit of first (7) and second (8) series-connected electronic switches is connected to common bus of power sources through second (11) frequency-setting capacitor. Input of voltage follower (14) is connected to the common bus of the power sources through third (12) frequency-setting capacitor. Output of voltage follower (14) is connected to inverting (4) input of differential operational amplifier (3) through series-connected third (9) and fourth (10) electronic switches. Common unit of series-connected third (9) and fourth (10) electronic switches is connected to common bus of power sources through fourth (13) frequency-setting capacitor.

EFFECT: high quality factor of the pole, ensuring independence of the transfer coefficient of the discrete-analogue filter at zero frequency from the capacitance values of frequency-setting capacitors, high manufacturability of the DAF with its microelectronic design.

1 cl, 7 dwg