OPERATIONAL AMPLIFIER WITH A LOW SYSTEMATIC ZERO-BIAS VOLTAGE COMPONENT Russian patent published in 2022 - IPC H03F3/45 H03F1/30 

FIELD: analogue microelectronics.

SUBSTANCE: invention relates to the field of analogue microelectronics and can be used in various analogue and analogue-to-digital interfaces (active RC filters, normalizing converters, etc.). The operational amplifier with a low level of the systematic zero bias voltage component additionally contains the first (13), second (14) and third (15) additional field-effect transistors, as well as the first (16) additional reference current source. The gate of the first (13) additional field effect transistor is connected to the gate of the first (10) output field effect transistor. The drain of the first (13) additional field effect transistor is connected to the drain of the first (10) output field effect transistor and the gate of the second (14) additional field effect transistor. The gate of the third (15) additional field effect transistor is connected to the gate of the second (14) additional field effect transistor. The drains of the second (14) and third (15) additional field-effect transistors are combined and connected to the current output of the device (12). Between the current output of the device (12) and the first (6) power supply bus, the first (16) additional reference current source is connected. The sources of the first (13), second (14) and third (15) additional field-effect transistors are connected to the second (9) power supply bus.

EFFECT: providing a low-level systematic component of the zero bias voltage with an operational amplifier under conditions of a change in the supply voltage.

5 cl, 8 dwg