BIPOLAR-FIELD OPERATIONAL AMPLIFIER Russian patent published in 2016 - IPC H03F3/45 

FIELD: radio engineering and communication; electricity.

SUBSTANCE: invention relates to radio electronics and specifically to precision signal amplification devices. Bipolar-field operational amplifier comprises first (1) and second (2) input field-effect transistors, integrated sources of which are connected to first (3) power supply bus through first (4) current-stabilising bipole, and gates are connected to corresponding inputs (5) and (6) of device, first (7) and second (8) output transistors, bases of which are integrated and connected to potential bias circuit (9), emitter of first (7) output transistor is connected to second (10) power supply bus through first (11) current-stabilising resistor, emitter of second (8) output transistor is connected to second (10) power supply bus through second (12) current-stabilising resistor, current mirror (13), matched with first (3) power supply bus, output of which is connected to current output of device (14) and collector of second (8) output transistor, and input of current mirror (13) is connected to collector of first (7) output transistor. Circuit includes first (15), second (16), third (17) and fourth (18) additional transistors, as well as first (19) and second (20) additional resistors, integrated collectors of first (15) and second (16) additional transistors are connected to sources of first (1) and second (2) input field-effect transistors, base of third (17) and fourth (18) additional transistors are connected to bases of first (7) and second (8) output transistors, base of first (15) additional transistor is connected to collector of third (17) additional transistor, emitter of first (15) additional transistor is connected to emitter of first (7) output transistor, emitter of third (17) additional transistor is connected to second (10) power supply bus through first (19) additional resistor, base of second (16) additional transistor is connected to collector of fourth (18) additional transistor, emitter of second (16) additional transistor is connected to emitter of second (8) output transistor, emitter of fourth (18) additional transistor is connected to second (10) power supply bus through second (20) additional resistor.

EFFECT: increasing gain of differential signal in open state of operational amplifier to 90÷100 dB.

1 cl, 10 dwg