An Improved Bandgap Reference with Curvature-Compensated and High Power Supply Rejection

作者：Wu, Hongbing; Liu, Hongxia^*

来源：Journal of Circuits, Systems, and Computers, 2016, 25(11): 1650147.

DOI：10.1142/S0218126616501474

• Bandgap reference
• high PSRR
• temperature coefficient (TC)
• pre-regulator
• curvature-compensation

This paper presents a bandgap reference (BGR) with the characteristics of curvature-compensation and high power supply rejection ratio (PSRR). To achieve a better performance, the base current of BJT is injected to a small segment of resistor string to flatten the temperature variation, and a pre-regulator of the power supply is implemented to improve the PSRR. The circuits, designed in 0.18 mu m BCD technology, exhibit an average voltage of 1.212 V with temperature coefficient of 2.0 ppm/degrees C in the range from -40 degrees C to 110 degrees C at typical condition, and a power supply rejection ratio of similar to 175.7 dB at low frequency. After 4-bit trimming, Monte Carlo simulation results show that the proposed design gets an accuracy of 0.29%, with a variation of +/- 3.5 mV. The active design area is 160 mu m x 206 mu m, and the power supply current is about 8.2 mu A.

• 出版日期2016-11
• 单位西安电子科技大学