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This paper presents a design and analysis method of a bandgap reference circuit. The Bandgap design is realized through the 0.18um CMOS process. Simulation results show that the bandgap circuit outputs 1.203V in the typical operation condition. The variance rate of output voltage is 0.026mV/°C with the operating temperature varying from -40°C to 125°C. And it is 3.89mV/V with the power supply changes from 1.62V to 1.98V The layout area is 0.245mm*0.133mm.