The circuit principle of the integrated operational amplifier is made of a P-type silicon wafer about 0.2~0.25mm thick, which is the substrate of the integrated circuit. A circuit containing dozens or more BJTS or FETs, resistors, and connecting wires can be made on the substrate.
In addition to, - input terminal and output terminal, the operational amplifier also has, - power supply terminal, external compensation circuit terminal, zero control terminal, phase compensation terminal, common ground terminal and other additional terminals. Its closed-loop magnification depends on the external feedback resistance, which brings great convenience to use.