A high-precision compensated CMOS bandgap voltage reference without resistors

  • Authors:

  • Xin Ming;Ying-Qian Ma;Ze-Kun Zhou;Bo Zhang

  • Affiliations:

  • State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China;State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China;State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China;State key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, China

  • Venue:
  • IEEE Transactions on Circuits and Systems II: Express Briefs
  • Year:
  • 2010

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Abstract

A high-precision compensated CMOS bandgap reference without resistors, which is fabricated in 0.5-µm CMOS technology, is presented in this brief. The circuit uses ratioed transistors together with the inverse-function technique to produce a first-order temperature-insensitive voltage reference. More importantly, a higher-order curvature correction method called VBE linearization is presented to directly compensate for the thermal nonlinearity of the base-emitter voltage. The power consumption of the proposed reference is 0.648 mW at 3.6 V.A temperature coefficient of 11.8 ppm/°C and power supply rejection ratio (PSRR) of more than 31 dB at low frequencies are easily achieved.