A precise bandgap reference with intrinsic compensation for current-mirror mismatch

Sizhen Li, Xuecheng Zou, Xiaofei Chen, Zhige Zou, Kai Yu, Hao Zhang
2008 APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems  
A precise bandgap reference with intrinsic compensation for current-mirror mismatch is presented. In the proposed circuit, the small-signal current variations in the two current paths are self-compensated while in the conventional bandgap core they are multiplied. As a result, error caused by current-mirror mismatch has been much reduced in the proposed circuit. Precise and simple models are developed for error analysis. The complete circuit has also been presented which features simplicity,
more » ... ures simplicity, high accuracy and low power. Based on the 0.6um BiCMOS process technology, the error caused by current-mirror mismatch has been reduced by about 50 times in the proposed bandgap core and the complete circuit achieves a low temperature coefficient of 3.8 ppm/°C and a high power supply rejection ratio (PSRR) of 92db. On typical working conditions, the proposed circuit consumes only a supply current of 3uA. I.
doi:10.1109/apccas.2008.4746241 dblp:conf/apccas/LiZCZYZ08 fatcat:zdmfqfpsfzh4lg465bvszxcsfa