DISCRETE-ANALOGUE LOW-PASS FILTER ON SWITCHED CAPACITORS Russian patent published in 2024 - IPC H03H19/00 

FIELD: radio engineering.

SUBSTANCE: present invention relates to radio engineering and can be used to select given signal spectra, for example, during analogue-to-digital conversions thereof. Advantage is achieved by introducing new connections between elements in the initial scheme of DAF in accordance with the claim. Such a circuit solution improves manufacturability of DAF in its microelectronic design. Discrete-analogue low-pass filter (DAF) on switched capacitors comprises input (1) and output (2) of the device, differential operational amplifier (3) with inverting (4) input and non-inverting (5) input connected to a common power supply bus, output of differential operational amplifier (3) is connected to output (2) of device and through series-connected first (6) and second (7) auxiliary resistors is connected to input of device (1), common unit of first (6) and second (7) auxiliary resistors is connected to input of voltage follower (8), wherein between the output of voltage follower (8) and inverting input (4) of differential operational amplifier (3) there are series-connected first (9), second (10), third (11) and fourth (12) electronic switches, first (13), second (14), third (15) and fourth (16) capacitors, wherein second (14) capacitor is connected between common unit of series-connected second (10) and third (11) electronic switches and common power supply bus, and fourth (16) capacitor is connected between the output of differential operational amplifier (3) and its inverting input (4). First (13) capacitor is connected between a common unit of series-connected first (9) and second (10) electronic switches and a common power supply bus, and third (15) capacitor is connected between the common unit of third (11) and fourth (12) electronic switches connected in series and the common power supply bus.

EFFECT: creation of a discrete-analogue filter on switched capacitors, in which most of the capacitors are connected to a common bus by one output.

1 cl, 7 dwg