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A Chopping-Free Single-Trim Bandgap Reference Using Amplifier With PTAT Offset H
提出一种无需斩波且单次修调的带隙基准电路，利用PTAT偏移放大器提高精度。
3–8 ppm/°C (-55°C~125°C), 1.5 µVrms噪声(0.1–10 Hz), 590 µA电流, 0.55 mm²面积
带隙基准PTAT偏移单次修调无斩波尾电阻偏置
▸采用PTAT偏移放大器替代传统差分放大器，简化偏移消除技术
▸仅需室温单次修调即可消除PTAT误差源
▸创新使用尾电阻生成放大器偏置电流，进一步简化电路结构
Abstract
This article presents a chopping-free single-trim
bandgap reference with an amplifier proportional-to-absolute-
temperature (PTAT) offset. This amplifier PTAT offset is helpful
for improving the BGR accuracy. Unlike the classic differential
amplifiers, whose input-referred offset is usually non-PTAT, the
proposed amplifier realizes a PTAT offset through controlling
the current of a BJT-based structure. Similar to other PTAT
error sources in a bandgap reference, this PTAT offset can be
eliminated