FIELD: radio engineering. SUBSTANCE: intermediate frequency amplifier has staged circuit of first, second and third differential amplifiers which is inserted between first and second detectors and is designed for supplying second detector with equalized voltage of input signal superimposed by corresponding shift potentials of direct-coupled circuit. Automatic gain control units control voltage gain in first and second differential amplifiers. Direct current feedback circuit is inserted between corresponding pair of output terminals of third differential amplifier and pair of input terminals of second differential amplifier. Said direct current feedback circuit has differential low-frequency filter circuit. EFFECT: increased reliability and stability. 9 cl, 9 dwg
