FIELD: amplifying low difference voltage between pair of input signals. SUBSTANCE: amplifier has first, second, third, and fourth complementary shapers first and second ones being input shapers connected to power and ground buses through first and second change-over devices; inputs of third and fourth shapers are connected to outputs of first and second ones and in cross-like manner to their own outputs; each complementary shaper is built up of two insulated-gate MOS transistors. EFFECT: reduced power requirement and improved amplification of output voltage. 2 cl, 12 dwg
