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Updated: Jan 19, 2026

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Fast Calibration Methods for Resistive Sensor Readout Based on Direct Interface Circuits.

José A Hidalgo-López1, Jesús A Botín-Córdoba2, José A Sánchez-Durán3,4

  • 1Departamento de Electrónica, Universidad de Málaga, Andalucía Tech, Campus de Teatinos, Málaga 29071, Spain. jahidalgo@uma.es.

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|September 11, 2019
PubMed
Summary

This study introduces a faster method for converting sensor resistance to digital data using a modified capacitor discharge technique. The new approach significantly reduces conversion time by optimizing resistor calibration, making it ideal for programmable digital devices.

Keywords:
calibration methodsdirect interface circuitserror analysisinterface sensorresistive sensortime-based measurement

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Digital Electronics

Background:

  • Direct interface circuits measure resistance via capacitor discharge time.
  • Existing methods can be slow, especially for high resistance values, due to calibration steps.
  • Time, temperature, and aging can affect measurement accuracy.

Purpose of the Study:

  • To develop a faster resistance-to-digital conversion method.
  • To reduce conversion time without significantly increasing measurement uncertainty.
  • To improve the efficiency of sensor interface circuits.

Main Methods:

  • A modified capacitor discharge process is proposed.
  • Part of the discharge is performed using a calibration resistor instead of solely the sensor.
  • Two variants of the method were tested for evaluation time and measurement uncertainty.
  • Experiments were conducted using a field-programmable gate array (FPGA).

Main Results:

  • Achieved reductions in resistance conversion time by up to 55%.
  • Demonstrated that measurement uncertainty can be kept negligible with appropriate parameter selection.
  • The modified method offers a significant speed improvement over traditional direct interface circuits.

Conclusions:

  • The proposed modified resistance measurement technique substantially accelerates conversion speed.
  • Negligible increases in measurement uncertainty are achievable, maintaining accuracy.
  • This method provides a more efficient solution for integrating sensors into digital systems.