Journal of Advanced Information Technology and Convergence (한국정보기술학회 영문논문지)

Korean Institute of Information Technology (한국정보기술학회)
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A Low Voltage Bandgap Current Reference with Low Dependence on Process, Power Supply, and Temperature

  • Cheon, Jimin (School of Electronic Engineering, Kumoh National Institute of Technology)
  • Received : 2018.12.04
  • Accepted : 2018.12.25
  • Published : 2018.12.31
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Abstract

The minimum power supply voltage of a typical bandgap current reference (BGCR) is limited by operating temperature and input common mode range (ICMR) of a feedback amplifier. A new BGCR using a bandgap voltage generator (BGVG) is proposed to minimize the effect of temperature, supply voltage, and process variation. The BGVG is designed with proportional to absolute temperature (PTAT) characteristic, and a feedback amplifier is designed with weak-inversion transistors for low voltage operation. It is verified with a $0.18-{\mu}m$ CMOS process with five corners for MOS transistors and three corners for BJTs. The proposed circuit is superior to other reported current references under temperature variation from $-40^{\circ}C$ to $120^{\circ}C$ and power supply variation from 1.2 V to 1.8 V. The total power consumption is $126{\mu}W$ under the conditions that the power supply voltage is 1.2 V, the output current is $10{\mu}A$, and the operating temperature is $20^{\circ}C$.

Keywords

Acknowledgement

Grant : HRD Program for Intelligent semiconductor Industry

Supported by : National Research Foundation of Korea (NRF), KIAT (Korea Institute for Advancement of Technology)

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