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Two-Capacitor Direct Interface Circuit for Resistive Sensor Measurements.

José A Hidalgo-López1, Óscar Oballe-Peinado1,2, Julián Castellanos-Ramos1,2

  • 1Departamento de Electrónica, Universidad de Málaga, Andalucía Tech, Campus de Teatinos, 29071 Málaga, Spain.

Sensors (Basel, Switzerland)
|March 6, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost hardware solution using an extra capacitor to significantly reduce errors in measuring high resistances with direct interface circuits (DICs). The novel approach improves measurement accuracy by up to 90% with only a minor increase in measurement time.

Keywords:
calibration methodsdirect interface circuitsinterface sensorresistive sensortime-based measurementuncertainty

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Embedded Systems

Background:

  • Direct interface circuits (DICs) offer a simplified approach to digital resistive sensor measurements, eliminating the need for signal conditioning and analog-to-digital converters (ADCs).
  • Existing DICs face challenges with quantization errors at low resistances and significant measurement uncertainties and high measurement times at high resistances.
  • The issue of increased uncertainty in high-resistance measurements using DICs remains largely unaddressed in current literature.

Purpose of the Study:

  • To present an economical hardware modification for direct interface circuits to mitigate measurement uncertainties at high resistance values.
  • To demonstrate a significant reduction in high-resistance measurement errors through the integration of an additional capacitor.
  • To implement and validate the proposed solution using a field-programmable gate array (FPGA).

Main Methods:

  • The proposed method involves augmenting a standard direct interface circuit with a single additional capacitor.
  • The circuit is implemented and controlled using a field-programmable gate array (FPGA) for digital processing.
  • Measurements are performed by analyzing capacitor discharge cycles, similar to traditional DICs.

Main Results:

  • The novel circuit design successfully reduces high-resistance measurement errors by up to 90%.
  • The integration of the extra capacitor specifically targets and mitigates the uncertainty issues prevalent at higher resistance values.
  • A slight increase in resistance estimation time was observed, ranging from 2.7% to 4.6%, due to the required three capacitor discharge cycles.

Conclusions:

  • The addition of a single capacitor to direct interface circuits provides an effective and economical solution for reducing high-resistance measurement uncertainties.
  • The FPGA-based implementation validates the practical applicability and performance improvements of the proposed circuit.
  • This advancement enhances the reliability of resistive sensor measurements in applications dealing with a wide range of resistance values.