2018•Journal of SemiconductorsRequires access
A 0.19 ppm/°C bandgap reference circuit with high-PSRR
Jing Ping Leng, Yangyang Lu, Yunwu Zhang, Huan Xu, Kongsheng Hu, Zhicheng Yu, Weifeng Sun, Jing Zhu
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Abstract
A high-order curvature-compensated CMOS bandgap reference (BGR) topology with a low temperature coefficient (TC) over a wide temperature range and a high power supply reject ratio (PSRR) is presented. High-order correction is realized by incorporating a nonlinear current I NL , which is generated by ∆ V GS across resistor into current generated by a conventional first-order current-mode BGR circuit. In order to achieve a high PSRR over a broad frequency range, a voltage pre-regulating technique is applied. The circuit was implemented in CSMC 0.5 μ m 600 V BCD process. The experimental results indicate that the proposed topology achieves TC of 0.19 ppm/°C over the temperature range of 165 °C (−40 to 125 °C), PSRR of −123 dB @ DC and −56 dB @ 100 kHz. In addition, it achieves a line regulation performance of 0.017%/V in the supply range of 2.8–20 V.