DISCRETE-ANALOGUE LOW-PASS FILTER ON SWITCHED CAPACITORS WITH HIGH POLE Q-FACTOR 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. Discrete-analogue low-pass filter on switched capacitors with high pole Q-factor 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), wherein common unit of first (6) and second (7) auxiliary resistors is connected to input of first (8) voltage follower, first (9), second (10) electronic switches and first (11) frequency-setting capacitor, wherein first (9), second (10) electronic switches and first (11) frequency-setting capacitor are connected in series between the output of first (8) voltage follower and the common power supply bus, second (12) frequency-setting capacitor, connected in parallel to first (9) electronic switch, third (13) frequency-setting capacitor connected between the output of device (2) and inverting input (4) of the differential operational amplifier (3), third (14) and fourth (15) electronic switches, fourth (16) frequency-setting capacitor. Circuit includes additional voltage follower (17), input of which is connected to first (11) frequency-setting capacitor, and output is connected to inverting input (4) of differential operational amplifier (3) through series-connected third (14) and fourth (15) electronic switches, wherein fourth (16) frequency-setting capacitor is connected in parallel to fourth (15) electronic switch.

EFFECT: creation of a discrete-analogue low-pass filter on switched capacitors, in which high Q-factor of a pole is realized with a smaller ratio of capacitances of frequency-setting capacitors.

1 cl, 7 dwg