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A linearization time-domain CMOS smart temperature sensor using a curvature compensation oscillator.

Chun-Chi Chen1, Hao-Wen Chen

  • 1Department of Electronic Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan. ccchen@nkfust.edu.tw

Sensors (Basel, Switzerland)
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Summary

This study introduces a cost-effective CMOS smart temperature sensor with enhanced linearity using a novel curvature compensation oscillator. The sensor operates efficiently across a wide temperature range, offering improved accuracy for integrated temperature sensing applications.

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Area of Science:

  • Integrated Circuit Design
  • Sensor Technology
  • CMOS Electronics

Background:

  • Inverter-based smart temperature sensors offer reduced cost and complexity.
  • Poor linearity is a significant challenge due to the temperature-to-time transfer curve's curvature.
  • Existing methods require complex circuitry for error correction.

Purpose of the Study:

  • To develop an area-efficient CMOS smart temperature sensor with improved linearity.
  • To address the inherent non-linearity in inverter-based temperature sensors.
  • To achieve high accuracy and resolution in a compact design.

Main Methods:

  • Utilized a temperature-to-pulse generator with a ring oscillator and time amplifier.
  • Implemented an on-chip curvature compensation oscillator for linearization.
  • Designed a time-domain sensor for proportional to absolute temperature (PTAT) pulse generation.

Main Results:

  • Achieved a small sensor area of 0.07 mm² in a standard CMOS process.
  • Obtained a high resolution of 0.045 °C.
  • Demonstrated an inaccuracy of -1.2 to 0.2 °C over -40 to 120 °C after calibration.
  • Measured power consumption of 23 mW at 10 samples/s.

Conclusions:

  • The proposed curvature compensation oscillator effectively linearizes the temperature sensor output.
  • The area-efficient design integrates high performance with low complexity.
  • This sensor is suitable for applications requiring accurate and compact temperature monitoring.