FIELD: radio engineering.
SUBSTANCE: active RC filter of the Sallen-Key class is proposed, which contains the input (1) and output (2) of the device, the first (3) and second (4) frequency-setting capacitors, the first (5) and second (6) frequency-setting resistors, the output voltage repeater (7), the third (8) resistor. The first (9) and second (10) additional voltage repeaters are introduced into the circuit, the first (11) and second (12) additional resistors, the common node of which is connected to the output of the second (10) additional voltage repeater through the first (3) frequency-setting capacitor, and the input of the second (10) additional voltage repeater is connected to the input of the output voltage repeater (7) through the second (4) frequency-setting capacitor.
EFFECT: invention enables to create a bandpass filter of the Sallen-Key family based on classical emitter and source voltage repeaters without general negative feedback, which provides for the possibility of resistive adjustment of the bandwidth without changing the frequency of the pole and the transmission coefficient.
1 cl, 4 dwg
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