RESISTORLESS GALLIUM ARSENIDE DIFFERENTIAL CASCADE AND OPERATIONAL AMPLIFIER BASED ON IT WITH LOW ZERO OFFSET VOLTAGE Russian patent published in 2024 - IPC H03F3/45 

FIELD: radio engineering.

SUBSTANCE: disclosed is a resistorless gallium arsenide operational amplifier based on a differential stage with a low zero offset voltage, in which matching two-terminal circuit (17) is made in form of two parallel connected emitter p-n junctions of bipolar transistors, first (19) current output of the device is connected to a common bus, current-stabilizing two-terminal circuit (9) is made in the form of two identical and parallel connected first (21) and second (22) reference current sources, second (20) current output of device is connected to first (10) bus through output reference current source (23), which circuit is identical to circuits of first (21) and second (22) reference current sources, first (3) and second (4) input three-terminal circuits are implemented on gallium arsenide cascode composite field-effect transistors (26) and (27).

EFFECT: creation of an operational amplifier circuit with a low level of a systematic component of zero offset voltage without using current mirrors on n-p-n or nJFet transistors.

1 cl, 4 dwg