This kind of operational amplifier is widely used in signal processing.
Tips
usage
Common in audio (音频放大器) and electronics (运算放大器, op-amp; 功率放大器, power amp; 前级放大器, preamp). The 器 (qì, 'device') suffix marks it as a piece of equipment, like 显示器 (display), 计算器 (calculator).