A novel sub-1V CMOS bandgap reference with high-order curvature compensation is proposed. Utilizing current mode structure with resistance division, the minimum operating supply voltage of the proposed bandgap circuit is 800mV. Utilizing high-order curvature compensation technique, the bandgap circuit produced a temperature coefficient of 3.65 ppm/Â°C in a temperature range between -40Â°C and 125Â°C. At 27Â°C, 1.2V supply voltage, the typical output reference voltage is 634.93mV, the total current is 24.34 uA, PSRR is 63.8 dB@DC. This proposed bandgap reference has been verified in SMIC 0.13-um mixed mode CMOS Technology, which can be applied in portable electronic products, DRAM, and flash memory.