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《Journal of Huazhong University of Science and Technology(Natural Science Edition)》 2013-08
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High-order piecewise nonlinear curvature correcting bandgap reference

Li Jinghu1 Zhang Xingbao1 Zhou Bin2a Sha Xuejun2b (1 School of Information and Electrical Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, Shandong China; 2a School of Electronic Science and Technology, b School of Information and Communication Engineering, Harbin Institute of Technology, Harbin 150080, China)  
By adding two current branches to a conventional first-order BGR (bandgap reference), a BGR for high-order piecewise nonlinear curvature correction was formed. In the lower temperature range (TR), the curvature correction circuit will subtract the current from the output branch of the first-order BGR to decrease its positive temperature dependence. While in the higher temperature range, the circuit will inject current to the output branch of the first-order BGR to compensate its negative temperature dependence. The proposed BGR was designed in Global Foundry 0.35 μm mixed-signal CMOS process with chip area of 0.14 mm2 and current of 47 μA. Simulation result shows the proposed BGR achieves four extrema in the TR of -40~125 ℃, which means the simulated temperature coefficient (TC) is only 0.7×10-6 ℃-1. Measurement result shows the TC, line regulation in the supply range of 2~4 V and low frequency PSR (power supply rejection) are 7.8×10-6 ℃-1, 0.8 mV·V-1, and -69.5 dB, respectively.
【Fund】: 国家自然科学基金资助项目(61100031);; 中央高校基本科研业务费专项资金资助项目(HIT.NSRIF.2013139).
【CateGory Index】: TN432
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