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本文提出一种数字辅助单点校准的CMOS带隙电压基准，用于燃油表等高精度应用。通过数字辅助校准技术，在单点校准条件下实现了±0.08%的3σ误差，显著提高了基准电压的精度。
Johannes Thielmann, Henrik Hassander, Herbert Gruber, Florian Hus, Christoph Sandner Infineon Technologies, Villach, Austria Accurate voltage references are key building blocks for almost all electronic systems. Specifically, fuel gauge applications benefit from very high precision references to allow for extremely precise measurement of battery voltage and current in order to provide an accurate measurement of the state of charge of the battery. In this work a digitally assisted single-point-trimmed CMOS bandgap voltage reference is presented. Compared to previous art [1-4], this work achieves a low inaccuracy of ±0.08% (3σ) from -40°C to +120°C. The residual temperature drift is as low as 7 ppm/°C. The key idea is to keep the analog bandgap core simple and only compensate non-PTAT related effects (like offset) by using chopping techniques. The remaining PTAT and chip-to-chip variations can then be
Gerhard Maderbacher, Stefano Marsili, Mario Motz, Thomas Jackum,