FIELD: radio engineering.
SUBSTANCE: low-pass filter as an output voltage amplifier (3) contains an inverting operational amplifier. The common node of first (12) frequency-setting capacitor and second (13) frequency-setting resistor installed in series is connected to the inverting input of output voltage amplifier (3) via first (16) additional resistor. Device output (2) is connected to the input of first (9) voltage follower via second (17) additional resistor, and second (15) frequency-setting capacitor is connected between the output of third (14) voltage follower and the inverting input of output voltage amplifier (3).
EFFECT: possibility of independent adjustment of the low-pass filter (LPF) gain, the pole frequency and the Q-factor of the LPF pole by different resistors and ensuring low sensitivity of the transmission coefficient at low frequency in the circuit to various destabilizing factors - tolerances for the parameters of the circuit elements and variations in their characteristics depending on temperature or radiation.
1 cl, 9 dwg
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