A low power sub-BGR with multi-curvature self-compensation

作者：Mu, Junchao; Liu, Lianxi^*

来源：Analog Integrated Circuits and Signal Processing, 2017, 92(1): 151-158.

DOI：10.1007/s10470-017-0963-x

• Low power
• Bandgap reference
• Curvature compensation

This paper proposes a low power sub bandgap reference (sub-BGR) with a novel multi-curvature self-compensation. The proposed circuit generates a curvature-compensation-less reference voltage (V-REF_NC), which is compared with the emitter-base voltage of a PNP transistor to generate a pair of complementary curvature currents. The curvature currents are used to compensate the temperature coefficient (TC) of the voltage V-REF_NC itself, resulting in a low-power and low-TC sub-BGR. The proposed circuit is implemented in a standard 65 nm complementary metal oxide semiconductor process. Simulation and measured results show the total power consumption is about 230 nW at the minimum supply voltage of 1.0 V. The power supply rejection ratio at low frequency is less than -66 dB. After trimming, the average TC of 23 ppm/A degrees C in the temperature range of -45 to 125 A degrees C and the accuracy of +/- 0.15% (sigma/A mu) can be achieved.

• 出版日期2017-7
• 单位西安电子科技大学