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A CMOS bandgap reference circuit

Two types of CMOS bandgap reference circuits are presented in this paper, which can be used in many low voltage analog circuits. The simulation results show that the accuracy of the output bandgap voltages are 1.228/sup +/-0.003 V and 1.215/sup +/-0.003 V respectively over the process, voltage and temperature variations, and the dissipation in the bandgap references are less than 0.1 mW and 0.34 mW respectively, with the 3.3 v supply.