A Design of high-low voltage compatible fully differential operational amplifier
Fanchao Zhou, Cheng Zhou, Yanling Li · Journal of Physics Conference Series · 2024
Abstract This paper presents a high-low voltage compatible wide-range fully differential operational amplifier designed using the DB HiTek 0.18 μm BCD process. The operational amplifier accurately tracks differential voltage changes within the input voltage range of 3~48 V. By employing common-mode voltage feedback, the amplifier achieves high-precision tracking of the differential voltage with a tracking voltage error accuracy of less than 1%. The designed fully differential operational amplifier finds applications in bidirectional Buck-boost converters, where it can be utilized for monitoring and controlling input/output current magnitude, preventing input power overload, and stabilizing dual-terminal voltages.