A single stage fully differential operational amplifier was designed in SMIC 0.18 μm mixed signal CMOS technology with 3.3 V power supply.The designed Op Amp utilizes gain boosting technique.The main Op Amp is a fully differential folded cascode Op Amp with switched capacitor CMFB.Two simple continuous time CMFB Op Amps are used as auxiliary Op Amp to increase the open loop gain of the main Op Amp.The simulation results show that the designed Op Amp achieves a DC gain of 110 dB with a unity gain frequency of 5 MHz.
