A 2.1-ppm/degrees C Current-Mode CMOS Bandgap Reference with Piecewise Curvature Compensation

作者：Wang Ruocheng; Lu Wengao; Niu Yuze; Liu Zhaokai; Zhao Meng; Zhang Yacong; Chen Zhongjian

来源：IEEE International Symposium on Circuits and Systems (ISCAS), 2017-05-28 to 2017-05-31.

• bandgap reference
• piecewise curvature compensation
• process variation
• trimming

This paper presents a high-precision, low temperature coefficient (TC) CMOS bandgap reference for high-performance multi-channel ADC working under wide temperature range. A piecewise curvature compensation technique is proposed to extend its operating temperature range and keep its low temperature coefficient. A beta-compensation technique is used to cancel the PTAT and non-PTAT spread of the output due to variation of beta in the BJTs. Moreover, the trimming resistors are implemented to calibrate the 1st-order temperature coefficient and absolute value of the output voltage. The bandgap reference designed in 0.18 mu m CMOS process has a super low temperature coefficient of 2.1ppm/degrees C over a wide temperature of -55 degrees C to 140 degrees C, making it appropriate to provide reference voltage for a high-precision ADC.

• 出版日期2017
• 单位北京大学