DIFFERENTIAL OPERATIONAL AMPLIFIER WITH LOW VOLTAGE OF ZERO SHIFT Russian patent published in 2011 - IPC H03F3/45 

FIELD: radio engineering.

SUBSTANCE: invention may be used as device for amplification of analog signals, in structure of analog microchips of various functional purpose (for instance, in comparators and precision operational amplifiers (OA) with low values of zero shift electromotive force). Differential operational amplifier with low voltage of zero shift comprises the first (1) and second (2) input transistors, between emitters of which a resistor (3) of local negative feedback is connected, the first current-stabilising dipole (CD) (4), connected to emitter of the first T (1), the second CD (5), current mirror (6), input of which is connected to collector of the first T (1), and output is connected to collector of the second T (2) and base of input T (7) of output emitter repeater, the third CD (8), related to output of device (9) and emitter T (7). Circuit includes auxiliary T (10), collector of which is connected to emitter of the second T (2), and emitter is connected to the second CD (5), and base is connected to circuit of potentials shift (11).

EFFECT: reduced absolute value of U_cm and its temperature drift.

4 cl, 11 dwg