MULTIDIFFERENTIAL OPERATING AMPLIFIER WITH LOW ZERO OFFSET VOLTAGE Russian patent published in 2015 - IPC H03F3/45 

FIELD: electricity.

SUBSTANCE: multidifferential operating amplifier with low zero offset voltage comprises transistors, a scaling resistor, a high-impedance unit 4, the third 5 and fourth 6 input transistors, a current mirror 8 matched with the first busbar 9 of the power supply source, an auxiliary transistor 18 connected by its emitter to the second busbar 12 of the power supply source through the fourth 19 auxiliary current-stabilising impedor while a collector is connected to the emitter of the fourth 6 input transistor, at that bases of the third 16 and fourth 18 auxiliary transistors are coupled to a voltage shift source 20. Bases of the first 11 and second 14 auxiliary transistors are connected to the emitter of the third 16 auxiliary transistor.

EFFECT: decreased absolute value U_offset and temperature and radiation changes stipulated by the drift β of transistors.

6 dwg