DISCRETE-ANALOGUE FILTER ON SWITCHED CAPACITORS 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. Discrete-analogue filter on switched capacitors additionally contains multidifferential operational amplifier (15) with two input ports. Inverting input (16) of the first port is connected to the output of multidifferential operational amplifier (15). Non-inverting input (17) of the first port is connected to output (2) of the device. Inverting input (18) of the second port is connected to a common bus of power supplies. Non-inverting input (19) of the second port 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. Input of voltage follower (14) is connected to the common power supply bus 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.

EFFECT: creation of a discrete-analogue filter (DAF) on switched capacitors, in which the filter transfer coefficient at zero frequency does not depend on the resistance of resistors and frequency-setting capacitors and is always equal to minus one, when implementing high Q-factors of a pole, a large ratio of capacitances of frequency-setting capacitors is not required.

1 cl, 7 dwg