Isolation operational amplifier is a special type of measurement amplification circuit where there is no direct circuit coupling between the input, output, and power supply circuits. This means that there is no common ground terminal in the signal transmission process. The isolation voltage between the input and output stages can withstand 5000V or more. The main advantages include: unidirectional signal transmission, complete electrical isolation between the input and output terminals, no influence of the output signal on the input terminal, strong anti-interference ability, stable operation, no mechanical contacts, long service life, and high transmission efficiency.Application areas: signal acquisition (motor phase, line voltage/current), products with motors (detection of motor phase and line current), inverter products (line overcurrent detection), etc.