Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 1 Kleinheubacher Berichte 2002 2003 10.5194/ars-1-181-2003 http://www.adv-radio-sci.net/1/181/2003/ http://www.adv-radio-sci.net/1/181/2003/ars-1-181-2003.html http://www.adv-radio-sci.net/1/181/2003/ars-1-181-2003.pdf 181 184 2005-05-05 A curvature-corrected CMOS bandgap reference O. Mitrea C. Popa A. M. Manolescu M. Glesner Darmstadt University of Technology, Karlstr. 15, 64283 Darmstadt, Germany University Politehnica of Bucharest, Bd. Iuliu Maniu 1–3, Bucharest, Romania This paper presents a CMOS bandgap reference that employs a curvature correction technique for compensating the nonlinear voltage temperature dependence of a diode connected BJT. The proposed circuit cancels the first and the second order terms in the <i>V_BE(T )</i> expansion by using the current of an autopolarizedWidlar source and a small correction current generated by a MOSFET biased in weak inversion. The voltage reference has been fabricated in a 0.35<i>µ</i>m 3Metal/2Poly CMOS technology and the chip area is approximately 70<i>µ</i>m × 110<i>µ</i>m. The measured temperature coefficient is about 10.5 ppm/K over a temperature range of 10– 90°C while the power consumption is less than 1.4mW.