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Related Experiment Video

Updated: Jun 10, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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Published on: October 28, 2022

A Piezoresistive-Sensor Nonlinearity Correction on-Chip Method with Highly Robust Class-AB Driving Capability.

Kai Jing^1,2, Yuhang Han¹, Shaoxiong Yuan¹

¹School of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, China.

Sensors (Basel, Switzerland)

|October 16, 2024

Summary

This study introduces a robust Class-AB power amplifier for correcting piezoresistive sensor nonlinearity. The on-chip system significantly reduces sensor errors, improving accuracy across various conditions.

Keywords:

Class-AB output op-amp folded-cascode amplifier nonlinear calibration piezoresistive sensor

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Area of Science:

Electrical Engineering
Integrated Circuit Design
Sensor Technology

Background:

Piezoresistive sensors often exhibit nonlinearity, impacting measurement accuracy.
On-chip nonlinearity correction is crucial for reliable sensor data acquisition.
Robust Class-AB power amplifiers are essential for efficient sensor interfacing.

Purpose of the Study:

To design and implement a robust Class-AB power amplifier for on-chip nonlinearity correction of pressure-mode sensors.
To enhance amplifier performance for piezoresistive sensing applications, including high gain and power rejection.
To develop an integrated system capable of correcting sensor nonlinearity under diverse operating conditions.

Main Methods:

Utilized a gain-boosting-aided folded cascode structure for high gain and power rejection.
Implemented a push-pull structure with miller compensation and adaptive output driving for efficiency and stability.
Integrated a 7-bit + sign DAC and a two-stage operational amplifier for flexible nonlinearity correction.

Main Results:

Achieved amplifier gain > 140 dB, phase margin of 68°, and unit gain bandwidth > 199.76 kHz.
The system corrected piezoresistive sensor nonlinearity up to ±2.5% under various Process-Voltage-Temperature (PVT) conditions.
Reduced nonlinearity to 4% of its original value, with a maximum output voltage error of 4 mV.

Conclusions:

The designed Class-AB power amplifier and integrated system effectively correct piezoresistive sensor nonlinearity.
The solution offers high performance, stability, and compatibility with a wide range of sensor resistances.
This work contributes to improved accuracy and reliability in pressure-mode sensor applications.