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A High-Accuracy Ultra-Low-Power Offset-Cancelation On-Off Bandgap Reference for Implantable Medical Electronics

1
School of Microelectronics, Xi’an Jiaotong University, Xi’an 710049, China
2
School of Information and Engineering, Jimei University, Fujian 361021, China
3
Department of Chemical and Materials Engineering, National University of Kaohsiung, No. 700, Kaohsiung University Rd., Nan-Tzu District, Kaohsiung 811, Taiwan
*
Authors to whom correspondence should be addressed.
Electronics 2019, 8(7), 814; https://doi.org/10.3390/electronics8070814
Received: 11 June 2019 / Revised: 18 July 2019 / Accepted: 19 July 2019 / Published: 21 July 2019
(This article belongs to the Section Microelectronics and Optoelectronics)
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Abstract

An ultra-low-power and high-accuracy on-off bandgap reference (BGR) is demonstrated in this paper for implantable medical electronics. The proposed BGR shows an average current consumption of 78 nA under 2.8 V supply and an output voltage of 1.17 V with an untrimmed accuracy of 0.69%. The on-off bandgap combined with sample-and-hold switched-RC filter is developed to reduce power consumption and noise. The on-off mechanism allows a relatively higher current in the sample phase to alleviate the process variation of bipolar transistors. To compensate the error caused by operational amplifier offset, the correlated double sampling strategy is adopted in the BGR. The proposed BGR is implemented in 0.35 μm standard CMOS process and occupies a total area of 0.063 mm2. Measurement results show that the circuit works properly in the supply voltage range of 1.8–3.2 V and achieves a line regulation of 0.59 mV/V. When the temperature varies from −20 to 80 °C, an average temperature coefficient of 19.6 ppm/°C is achieved. View Full-Text
Keywords: bandgap reference; ultra-low power; high accuracy; switched-RC; correlated double sampling bandgap reference; ultra-low power; high accuracy; switched-RC; correlated double sampling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xu, J.; Wang, Y.; Wu, M.; Zhang, R.; Wei, S.; Zhang, G.; Yang, C.-F. A High-Accuracy Ultra-Low-Power Offset-Cancelation On-Off Bandgap Reference for Implantable Medical Electronics. Electronics 2019, 8, 814.

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