FIELD: electrical and electronics engineering.
SUBSTANCE: two-channel low-pass filter of the Sallen-Key family with a tunable upper cut-off frequency, contains an input (1) and an output (2) of the device, the first (3) and second (4) frequency-setting resistors connected in series between the input (1) of the device and the input of the output repeater voltage (5), the first (6) frequency-setting capacitor connected between the input of the output voltage follower (5) and the common power supply bus (7), the second (8) frequency-setting capacitor. The first (9) and second (10) non-inverting voltage amplifiers are introduced into the circuit, the input of the first (9) non-inverting voltage amplifier is connected to the input of the output voltage follower (5), between the output of the first (9) non-inverting voltage amplifier and the common power supply bus (7) the first (11) and second (12) additional resistors connected in series are included by alternating current, the common node of which is connected to the input of the second (10) non-inverting voltage amplifier, and between the common node of the first (3) and second (4) frequency-setting resistors connected in series and the output of the second (10) non-inverting voltage amplifier the second (8) frequency-setting capacitor is included.
EFFECT: creation of a two-channel low-pass filter of the Sallen-Key family, which provides for the possibility of independent adjustment of the upper cut-off frequency without changing the unit transmission coefficient in the passband range.
4 cl, 6 dwg
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