A novel sub-1V bandgap reference with offset compensated techniques

作者：Zhang, Yun-wu; Zhu, Jing; Sun, Wei-feng^*; Sun, Guodong; Lu, Sheng-li

来源：Analog Integrated Circuits and Signal Processing, 2014, 78(2): 391-397.

DOI：10.1007/s10470-013-0178-8

• Bandgap reference
• Offset voltage
• Sub-1V
• Temperature coefficient

A sub-1V bandgap reference (BGR) featuring with low offset is proposed. In order to reduce the effect of the offset of the operation amplifiers, the proposed BGR introduces feedback paths to not only realize sub-1V output but also reduce the factor of operation amplifier's offset voltage. In addition, a cross-coupled structure is dedicated to reduce the offset voltage factor further by increasing the bipolar junction transistor's base emitter voltage difference. The new proposed offset-compensated BGR has been successfully verified in a 0.5 mu m BCD process. The relative accuracy is increased by 4 times compared with the conventional circuit. Furthermore, the proposed circuit achieves a temperature coefficient of 8.5 ppm/A degrees C over a wide temperature range of -20 to 120 A degrees C, power supply rejection ratio of more than 70 dB at low frequencies and a line regulation of 0.09 % easily, without requiring additional operational amplifiers or complex circuits.

• 出版日期2014-2
• 单位东南大学