A 1.2-V Piecewise Curvature-Corrected Bandgap Reference in 0.5 [Formula Omitted]m CMOS Process

• Published in: IEEE transactions on very large scale integration (VLSI) systems 2011-06, Vol.19 (6), p.1118
• Main Authors: Li, Jing-Hu, Zhang, Xing-bao, Yu, Ming-yan
• Format: Article
• Language: English
• ISSN: 1063-8210; 1557-9999
• DOI: 10.1109/TVLSI.2010.2045519

A 1.2-V piecewise curvature-corrected CMOS bandgap reference (BGR) is proposed. It features in utilizing piecewise nonlinear curvature-corrected current and rail-to-rail operational amplifier to a conventional first-order current-mode BGR. The corrected current is zero, exponential with temperature and proportional to the squared temperature in the lower, middle and higher temperature range (TR). The rail-to-rail operational amplifier biased by a current proportional to absolute temperature (PTAT) helps to provide negative feedback for the proposed BGR. Measured results indicate that the proposed BGR achieves temperature coefficient (TC) of 8.9 ppm/[Formula Omitted]C in the TR of [Formula Omitted]40 [Formula Omitted]C-110 [Formula Omitted]C without trimming, power supply rejection (PSR) of [Formula Omitted]58 dB and line regulation of 2.4 mV/V in the supply range of 1.2-3.2 V. It is fabricated in CSMC 0.5-[Formula Omitted]m mixed-signal CMOS process with power consumption of 48 [Formula Omitted]W and effective chip area of 0.1 mm[Formula Omitted].