Interference Resilient Sigma Delta-Based Pulse Oximeter

Area of Science:

• Biomedical Engineering
• Signal Processing
• Medical Devices

Background:

• Ambient light and optical interference degrade pulse oximeter performance.
• Conventional time division modulation in pulse oximeters is susceptible to ambient light, causing significant measurement errors.
• Robust modulation techniques are crucial for reliable pulse oximetry.

Purpose of the Study:

• To present a novel cross-coupled sigma delta modulator for pulse oximeters.
• To enhance measurement accuracy and robustness against artificial ambient light.
• To improve power management in pulse oximeters.

Main Methods:

• Development of a novel cross-coupled sigma delta modulator.
• Implementation of a new modulation technique for pulse oximeter LEDs.
• Comparison with conventional fixed-frequency oximeter modulation techniques.

Main Results:

• The novel modulator significantly improves robustness against pulsed artificial ambient light.
• Enhanced measurement accuracy compared to conventional fixed-frequency modulation.
• Achieved improved control over pulse oximeter power consumption.

Conclusions:

• The novel cross-coupled sigma delta modulator offers superior performance in challenging ambient light conditions.
• This technique provides a more reliable and accurate pulse oximetry solution.
• The modulator contributes to better power management in pulse oximeter devices.