LED ARRAY DRIVING CIRCUIT WITH FAST-RESPONSE CONTROL FOR INDOOR VISIBLE LIGHT COMMUNICATION SYSTEMS

Document Type : Original Article

Authors

1 Electronics Research Institute (ERI), Cairo 11843, Egypt.

2 Electronics Research Institute (ERI), Cairo 11843, Egypt

3 Electronics and Electrical Communications Dept., Faculty of Engineering, Al-Azhar University, Cairo, 11884, Egypt

Abstract

This paper presents the design and implementation of a high-speed LED array driving circuit tailored for indoor visible light communication (VLC) systems. The proposed circuit integrates both light intensity modulation for data transmission and luminance control for consistent room illumination. A closed-loop feedback mechanism is implemented using cost-effective, commercially available components to achieve stable and linear optical output, which is essential for minimizing distortion at high data rates. The circuit employs a fast-response current control technique that dynamically adjusts the LED driving current based on real-time measurements, ensuring accurate transmission of On-Off Keying (OOK) modulated signals. Detailed analysis of the control system is provided, including the dependence of the system response time on the LED current. Experimental and simulation results confirm that the driving circuit achieves a rise time as low as 440 ps, supporting data rates up to 500 Mbps while maintaining the desired average illuminance level. The proposed design demonstrates a practical and efficient solution for high-speed indoor VLC using widely accessible components, paving the way for future cost-effective optical wireless communication systems

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