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Integrated Precision High-Frequency Signal Conditioner for Variable Impedance Sensors.

Miodrag Brkić¹, Jelena Radić¹, Kalman Babković¹

¹Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovića 6, 21000 Novi Sad, Serbia.

Sensors (Basel, Switzerland)

|October 26, 2024

Summary

This study presents a novel integrated signal conditioner for variable impedance sensors, specifically designed for inductive linear displacement sensors. The conditioner enables precise, real-time impedance magnitude measurement for fast sensors with low output impedance.

Keywords:

CMOS technology sensors signal conditioning

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Area of Science:

Electrical Engineering
Sensor Technology
Integrated Circuit Design

Background:

Variable impedance sensors are crucial for various applications, requiring accurate signal conditioning.
Existing solutions may lack the precision, speed, or integration necessary for advanced sensor systems.

Purpose of the Study:

To design and simulate an integrated signal conditioner for variable impedance sensors.
To enable real-time impedance magnitude measurement for fast sensors.
To achieve a low-cost, compact, and power-efficient solution.

Main Methods:

A discrete realization of a signal conditioner for an inductive linear displacement sensor was developed.
An integrated conditioner was proposed, comprising an amplifier, tunable band-pass filter, and AC-DC converter.
The conditioner measures impedance magnitude using a simplified vector measurement of sensor voltage and current.

Main Results:

The integrated conditioner demonstrates an inductance measurement range of 10 nH to 550 nH with 1.2% nonlinearity.
The design operates at 8 MHz but is adjustable to other frequencies via the tunable filter.
The integrated circuit (IC) occupies 500 × 330 μm² and consumes 93.8 mW.

Conclusions:

The proposed integrated signal conditioner meets the requirements for real-time measurement of fast, low-impedance sensors.
The low-cost CMOS design offers a versatile and efficient solution for variable impedance sensing applications.
Simulation results validate the performance and potential of the developed IC.