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A Curvature-Compensated CMOS Bandgap Voltage Reference for High Precision Applications

LI Hua,L Jian,JIANG Yadong(State Key Lab of Elec.Thin-film and Integr.Dev.,Univ.of Elec.Sci.and Technol.of China,Chengdu 610054,P.R.China)  
A high precision bandgap reference with higher-order curvature compensation was designed.The higher-order compensation of VBE was implemented by utilizing Buck's voltage transfer cell and temperature independent current.Test results showed that the circuit had a temperature coefficient of 5.9×10-6 V/℃ in the temperature range from-45 ℃ to 125 ℃,and an average line regulation of 0.4 mV/V for 3.5 V to 5.5 V supply voltage.A low voltage cascode current mirror was also introduced to reduce the dependency on supply voltage,thus eliminating the conflict between precision and margin.
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