A 3.0 μ Vrms, 2.4 ppm/°C BGR With Feedback Coefficient Enhancement and Bowl-Shaped Curvature Compensation

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Abstract
This paper demonstrates a low-noise, offset and temperature coefficient (TC) bandgap reference for the portable biopotential signal monitoring system. The proposed feedback coefficient enhancement technique suppresses the low-frequency noise and offset voltage. Besides, the bowl-shaped curvature compensation is applied in the BGR to obtain a decent TC. The proposed bandgap reference was designed and fabricated by the 0.18 $\mu $ m deep N-well CMOS technology with an active area of 0.088 mm $^{\mathbf{2}}$ . Experimental results show that this BGR outputs 0.6 V reference voltage under 1.2 V supply voltage while consuming 60 $\mu $ W power. The measured integrated noise from 0.1 to 10 Hz is about 3.0 $\mu$ V(rms). In addition, the average TC of the BGR is 2.4 ppm / $^{\circ}$ C from $-$ 45 $^{\circ}$ C to 125 $^{\circ}$ C after trimming.
Funding Information
  • National Natural Science Foundation of China (62204183, 62131010)
  • Key Research and Development Project in Shaanxi Province (2023-YBGY-189)
  • Natural Science Foundation of Chongqing, China (2022NSCQ-BHX3990, cstc2021jcyj-msxm3684)
  • Chongqing Talents Program (CQYC-20210301367)
  • Natural Science Basic Research Program of Shaanxi (2022JC-39)
  • Cooperation Program of Xidian University (XDU)-Chongqing IC Innovation Research Institute (CQIRI-2022CXY-Y12)

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