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A 0.18 μm CMOS LDO Regulator for an On-Chip Sensor Array Impedance Measurement System.

Jorge Pérez-Bailón1, Alejandro Márquez2, Belén Calvo3

  • 1Group of Electronic Design, Aragon Institute for Engineering Research, I3A, University of Zaragoza, 50009 Zaragoza, Spain. jorgepb@unizar.es.

Sensors (Basel, Switzerland)
|May 5, 2018
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Summary

A new Low-Dropout (LDO) Voltage Regulator for battery-powered impedance sensors offers stable 1.8V output. This compact, efficient design achieves excellent performance across a wide temperature range.

Keywords:
CMOS analog integrated circuitsimpedance spectroscopylow dropout regulator (LDO)sensor array

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Area of Science:

  • Integrated Circuit Design
  • Analog Electronics
  • Biomedical Instrumentation

Background:

  • Battery-operated micro-instruments require highly efficient and stable power management solutions.
  • Impedance spectrometry demands precise voltage regulation for accurate measurements.
  • Existing voltage regulators may not meet the size, power, and performance constraints of portable systems.

Purpose of the Study:

  • To design and validate a fully integrated 0.18 μm CMOS Low-Dropout (LDO) Voltage Regulator.
  • To meet the stringent power supply requirements of a multichannel CMOS micro-instrument for impedance spectrometry.
  • To achieve a compact, low-power, and high-performance LDO suitable for portable applications.

Main Methods:

  • Implementation of a compact LDO topology in a 0.18 μm CMOS process.
  • Characterization of the LDO's performance over a wide temperature range (-40°C to 100°C).
  • Evaluation of quiescent current, current efficiency, and transient response.

Main Results:

  • The LDO provides a stable 1.8 V output from a 3.6 V to 1.94 V battery input.
  • Achieved a compact chip area of less than 0.10 mm².
  • Demonstrated a low quiescent current of 7.45 μA with 99.985% current efficiency.
  • Exhibited state-of-the-art Figures of Merit (FoMs) for regulating-transient performance.

Conclusions:

  • The developed LDO is highly suitable for battery-operated impedance spectrometry micro-instruments.
  • The compact size and high efficiency enable the development of portable System on Chip (SoC) platforms.
  • This work contributes to the advancement of portable biosensing and diagnostic devices.