阅读说明：本技术 运算放大器及其控制方法 (Operational amplifier and control method thereof ) 是由 王文祺 黄思衡 于 2018-04-12 设计创作，主要内容包括：本申请提供了一种运算放大器,其特征在于,包括第一放大级,用来根据多个输入电压产生多个第一输出电压；第二放大级,用来根据所述多个第一输出电压,产生多个第二输出电压；第二输出级电路,用来复制与所述第一输出级电路相同或等比例缩小的电路；第一共模回馈电路,用来将所述第二输出级电路的输出共模电压,维持于一预设值；逻辑回路电路,用来于所述运算放大器于直流校正时,调整所述第一放大级的所述多个第一输出电压的差值；偏压电路,用来产生在运算放大器开启后与所述第一放大级的所述多个第一输出电压的共模电压相近的电压,以作为第二共模回馈电路的参考电压。本申请提供的运算放大器具有降低电压突波,避免产生爆音噪声的优点。(The application provides an operational amplifier, which is characterized by comprising a first amplification stage, a second amplification stage and a third amplification stage, wherein the first amplification stage is used for generating a plurality of first output voltages according to a plurality of input voltages; a second amplification stage for generating a plurality of second output voltages according to the plurality of first output voltages; a second output stage circuit for replicating a circuit that is the same as or scaled down from the first output stage circuit; the first common-mode feedback circuit is used for maintaining the output common-mode voltage of the second output stage circuit at a preset value; a logic loop circuit for adjusting the difference between the first output voltages of the first amplifier stage when the operational amplifier is performing dc calibration; the bias circuit is used for generating a voltage which is close to the common-mode voltage of the plurality of first output voltages of the first amplification stage after the operational amplifier is started, and the voltage is used as a reference voltage of the second common-mode feedback circuit. The operational amplifier provided by the application has the advantages of reducing voltage surge and avoiding the generation of popping noise.)