Design of a High-Performance CMOS Two-Stage Operational Amplifier
A high performance two-stage operational amplifier is designed based on 0.18 µ m standard CMOS tech-nology.The input stage adopts pmos differential input Folded-Cascode and the output stage adopts common-source structure,and the two are cascaded to achieve double-terminal input and single-terminal output.The entire circuit is provided with a stable bias by a band-gap reference source.The simulation results show that the static power con-sumption is 1.37mW,the open-loop gain is 117.36dB,the phase margin is 77.73°,the unit gain bandwidth is 100.4MHz(load capacitance is 2pF),the slew rate is 51.24V/µs,and the common-mode rejection ratio is 109.41dB.The negative power rejection ratio is 123.58dB,and the layout area is 180 μ m × 253.5 µ m.The test results show that the circuit structure of the operational amplifier is stable and its performance is superior.
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