Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Design Features of Instrumental Amplifiers Based on Multidifferential Operational Amplifiers for Analog Sensor Interfaces S.V. FEDOROV This article discusses instrumental amplifiers based on operational amplifiers for analog sensor interfaces. The classical scheme of the instrumental amplifier is given and the disadvantages of these amplifiers are described. In order to improve the parameters of the instrumental amplifier, a multidifferential operational amplifier based on the KR140UD1A amplifi er was designed. Comparisons of the parameters of the classical operational amplifier KR140UD1A with the proposed instrumental amplifier showed a significant decrease in the value of the zero offset voltage and an increase in the attenuation coefficient of the common-mode input voltage by two times. At the same time, the instrument amplifier circuit was built on a single multidifferential operational amplifi er and without additional resistors affecting these parameters. Keywords: multidifferential operational amplifier, instrumental amplifier, sensor interfaces, common-mode voltage attenuation coefficient, zero offset voltage. DOI: 10.25791/pribor.12.2021.1306 Pp. 01-05.