An 1.4 ppm/°C bandgap voltage reference with automatic curvature-compensation technique

Zekun Zhou; Hongming Yu; Yue Shi; Bo Zhang

doi:10.1117/12.2300345

19 December 2017 An 1.4 ppm/°C bandgap voltage reference with automatic curvature-compensation technique

Zekun Zhou, Hongming Yu, Yue Shi, Bo Zhang

Proceedings Volume 10613, 2017 International Conference on Robotics and Machine Vision; 106130I (2017) https://doi.org/10.1117/12.2300345
Event: Second International Conference on Robotics and Machine Vision, 2017, Kitakyushu, Japan

Abstract

A high-precision Bandgap voltage reference (BGR) with a novel curvature-compensation scheme is proposed in this paper. The temperature coefficient (TC) can be automatically optimized with a built-in adaptive curvature-compensation technique, which is realized in a digitization control way. Firstly, an exponential curvature compensation method is adopted to reduce the TC in a certain degree, especially in low temperature range. Then, the temperature drift of BGR in higher temperature range can be further minimized by dynamic zero-temperature-coefficient point tracking with temperature changes. With the help of proposed adaptive signal processing, the output voltage of BGR can approximately maintain zero TC in a wider temperature range. Experiment results of the BGR proposed in this paper, which is implemented in 0.35-μm BCD process, illustrate that the TC of 1.4ppm/°C is realized under the power supply voltage of 3.6V and the power supply rejection of the proposed circuit is -67dB.

Citation Download Citation

Zekun Zhou, Hongming Yu, Yue Shi, and Bo Zhang "An 1.4 ppm/°C bandgap voltage reference with automatic curvature-compensation technique", Proc. SPIE 10613, 2017 International Conference on Robotics and Machine Vision, 106130I (19 December 2017); https://doi.org/10.1117/12.2300345

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