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Note: Direct sensor resistance-to-frequency conversion with generalized impedance converter.

D Ramírez Muñoz1, J Sánchez Moreno, S Casans Berga

  • 1Department of Electronic Engineering, University of Valencia, C∕ Doctor Moliner, 50, 46100-Burjassot, Spain. diego.ramirez@uv.es

The Review of Scientific Instruments
|January 5, 2011
PubMed
Summary
This summary is machine-generated.

This study presents a novel method for generating a squared output signal whose frequency is linearly dependent on resistive temperature sensor resistance. This enables direct analog-to-digital interfacing for resistive sensors in low-power electronic systems.

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Area of Science:

  • Electronics
  • Sensor Technology
  • Signal Processing

Background:

  • Resistive sensors are crucial for temperature measurement but often require complex signal conditioning.
  • Existing methods for interfacing resistive sensors can be cumbersome and power-intensive.
  • A direct analog-to-digital interface for resistive sensors is desirable for portable instrumentation.

Purpose of the Study:

  • To develop a circuit that generates a squared output signal with frequency linearly dependent on resistive sensor resistance.
  • To enable a direct analog-to-digital interface for resistive sensor information.
  • To explore applications in low-voltage, low-power electronic instrumentation.

Main Methods:

  • Utilized an astable circuit to generate a squared output signal.
  • Employed a generalized impedance converter configured as a sensor-resistance-controlled capacitor.
  • Established a linear frequency dependence on the resistive temperature sensor's resistance value.

Main Results:

  • Successfully generated a squared output signal.
  • Achieved a linear relationship between the output signal frequency and the sensor resistance.
  • Demonstrated a direct analog-to-digital interface capability for resistive sensors.

Conclusions:

  • The proposed generalized impedance converter configuration effectively linearizes the relationship between sensor resistance and output signal frequency.
  • This method offers a straightforward analog-to-digital interface for resistive sensors.
  • The circuit is suitable for portable, low-voltage, and low-power instrumentation applications.