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Charge Redistribution Mitigation and Optimization for Sensor-ADC Interfacing in Low Cost Embedded Applications.

Boyan Shabanski¹, Angel Marinov¹

¹Department of Electronics and Microelectronics, Faculty of Computer Sciences and Automation, Technical University of Varna, 9010 Varna, Bulgaria.

Sensors (Basel, Switzerland)

|August 28, 2025

Summary

This summary is machine-generated.

A new five-component circuit effectively reduces charge redistribution errors in Analog-to-Digital Converter (ADC) inputs for embedded systems. This cost-effective solution significantly improves settling times and accuracy in multiplexed sensor applications.

Keywords:

ADC interface Gray code capacitive precharging charge injection charge redistribution embedded systems low-cost design multiplexer sensor accuracy transient effects

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Data Acquisition Protocol for Determining Embedded Sensitivity Functions

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Area of Science:

Electrical Engineering
Embedded Systems
Analog-to-Digital Conversion

Background:

Charge redistribution effects in Analog-to-Digital Converter (ADC) inputs degrade accuracy, especially with multiplexed high-output-resistance sources in embedded applications.
Traditional methods like grounding or leaving inputs floating are insufficient for mitigating these transient glitches and settling time issues.

Purpose of the Study:

To propose and validate a cost-effective, discrete capacitive pre-charging circuit for ADC inputs.
To mitigate charge redistribution effects and reduce settling times in low-cost embedded sensor systems.

Main Methods:

Developed a five-component discrete circuit using two capacitors and three switches.
Leveraged multiplexer features to pre-charge ADC inputs to approximately half the reference voltage.
Analyzed and experimentally validated the circuit's performance against conventional methods.

Main Results:

Achieved pre-charging to approximately half the reference voltage, reducing transient glitches.
Demonstrated significant improvement in settling times, up to 1.4 µs shorter than conventional approaches.
Provided component selection guidelines, addressing charge injection and other practical concerns.

Conclusions:

The proposed discrete capacitive pre-charging method effectively addresses charge redistribution challenges in ADC inputs.
This practical, minimal-component strategy enhances ADC input accuracy and response speed in resource-limited embedded systems.
The solution offers a cost-effective approach for improving performance in multiplexed high-output-resistance source applications.