Active filter with op amp gain. Scheme, description

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Active filter with op amp gain. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Tone, volume controls

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An elegant and no less effective solution - a filtering amplifier (Power Filter) - was proposed by SGS-THOMSON. The proposed circuit combines a power amplifier and a second (12 dB/octave) or third order (18 dB/octave) filter.

Active filter with op amp gain. Scheme

The operation of the circuit is based on the fact that there are two identical common-mode voltages at the signal input and the feedback input of the amplifier, which is required for the operation of the active filter. The resistance from the OOS input side is usually about 100 ohms, from the signal side it is very high, which also contributes to the correct operation of the circuit. Schematically, they are similar to Sallen-Key filters. The figure shows a diagram of an RF filtering amplifier with a cutoff frequency of 900 Hz, which implements a 3rd order Bessel filter.

Literature

Ivanov A. Finely compensated volume control - Radio No. 12/1993 p.21
Zuev P. Volume control with distributed frequency correction - Radio No. 8/1986 p.49-51
Davydov M. Acoustic systems of broadcasting receivers - Radio No. 4 / 1956 pp. 52-54
Bozdeh J. Designing additional devices for tape recorders (1977, translated from Czech) - M. Energoizdat, 1981. pp. 174,188.

Publication: cxem.net

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