High-PSRR High-Order Curvature-Compensated CMOS Bandgap Voltage Reference

Qianneng Zhou¹, Yunsong Li¹, Jinzhao Lin¹, Hongjuan Li², Yu Pang¹,Wei Luo³ ¡¼JZ¡½¡¼

(1. Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China; 2.College of Computer Science and Technology, ChongqingUniversity of Posts and Telecommunications, Chongqing 400065, China; 3. School of Electronic Information and Automation,Sichuan University of Science and Engineering, Zigong Sichuan 643000, China)



Abstract:

A high-PSRR high-order curvature-compensated CMOS bandgap voltage reference (BGR), which has the performances of high power supply rejection ratio (PSRR) and low temperature coefficient, is designed in SMIC 0.18 ¦Ìm CMOS process. Compared to the conventional curvature-compensated BGR which adopted a piecewise-linear current, the temperature characterize of the proposed BGR is effectively improved by adopting two kinds of current including a piecewise-linear current and a current proportional 1.5 party to the absolute temperature T. By adopting a low dropout (LDO) regulator whose output voltage is the operating supply voltage of the proposed BGR core circuit instead of power supply voltage Vª­ª«DDª«, the proposed BGR with LDO regulator achieves a well PSRR performance than the BGR without LDO regulator. Simulation results show that the proposed BGR with LDO regulator achieves a temperature coefficient of 2.1 ¡Á10-6/¡æ with a 1.8 V power supply voltage and a line regulation of 4.9 ¦ÌV/V at 27 ¡æ. The proposed BGR with LDO regulator at 10 Hz, 100 Hz, 1 kHz, 10 kHz and 100 kHz have the PSRR of -106.388, -106.388, -106.38, -105.93 and -88.67 dB respectively.

Key words:  bandgap voltage reference  low dropout regulator  temperature coefficient  power supply rejection ratio

DOI£º10.11916/j.issn.1005-9113.2015.05.018

Clc Number:TN432

Fund: