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A Nanoscale Low-Power Resistorless Voltage Reference with High PSRR.

Zekun Zhou1, Jianwen Cao1, Yunkun Wang1

  • 1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China.

Nanoscale Research Letters
|January 26, 2019
PubMed
Summary

This study introduces a novel nano-watt, resistorless subthreshold voltage reference. It achieves high power supply rejection ratio (PSRR) and temperature stability using a self-biased MOS voltage divider and delta threshold voltage compensation.

Keywords:
High PSRRLow-powerNanoscaleResistorlessSubthreshold

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Area of Science:

  • Integrated Circuit Design
  • Analog Electronics
  • Low-Power Electronics

Background:

  • Subthreshold voltage references are crucial for low-power electronics.
  • Achieving high power supply rejection ratio (PSRR) and temperature stability simultaneously is challenging.
  • Traditional designs often require resistors or external capacitors, increasing area and power consumption.

Purpose of the Study:

  • To present a nano-watt, resistorless subthreshold voltage reference.
  • To achieve high PSRR and excellent temperature stability.
  • To enable operation at ultra-low supply voltages.

Main Methods:

  • A self-biased MOS voltage divider generates a positive temperature coefficient (TC) bias current.
  • Injecting this current into a transistor with a different threshold voltage creates a delta threshold voltage.
  • This delta threshold voltage is compensated by the positive TC current for temperature stability.

Main Results:

  • Achieved a temperature-stable reference voltage of 148 mV with a TC of 28 ppm/°C over -30 to 80°C.
  • Demonstrated ultra-low power consumption of 2.28 nW.
  • Obtained a high PSRR of 53 dB at 100 Hz without filtering capacitors.
  • Minimum operating supply voltage as low as 0.35 V.

Conclusions:

  • The proposed design offers a compact, resistorless, and low-power solution for voltage references.
  • It effectively compensates for temperature variations and maintains high PSRR.
  • Suitable for ultra-low voltage and low-power applications in modern integrated circuits.