A 3.5ppm/°C 0.85V Bandgap Reference Circuit without Resistors

Jing WANG  Qiang LI  Li DING  Hirofumi SHINOHARA  Yasuaki INOUE  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E99-A   No.7   pp.1430-1437
Publication Date: 2016/07/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E99.A.1430
Type of Manuscript: PAPER
Category: VLSI Design Technology and CAD
analog,  bandgap reference,  sub-1-V,  voltage reference,  supply-insensitive,  

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A CMOS bandgap reference circuit without resistors, which can successfully operate under 1V supply voltage is proposed. The improvement is realized by the technique of the voltage divider and a new current source. The most attractive merit is that the proposed circuit breaks the bottleneck of low supply voltage design caused by the constant bandgap voltage value (1.25V). Moreover, the temperature coefficient of the reference voltage Vref is improved by compensating the temperature dependence caused by the current source. The simulation results using a standard CMOS 0.18 um process show that the value of Vref can be achieved around 0.5 V with a minimum supply voltage of 0.85 V. Meanwhile, the temperature coefficient of the output voltage is only 3.5ppm/°C from 0 °C to 70 °C.