LED ARRAY DRIVING CIRCUIT WITH FAST-RESPONSE CONTROL FOR INDOOR VISIBLE LIGHT COMMUNICATION SYSTEMS | ||||
| Journal of Al-Azhar University Engineering Sector | ||||
| Volume 20, Issue 76, July 2025, Page 963-973 PDF (923.76 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/auej.2025.376774.1818 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Walid M. Fahmi  1; Khalid Fawzy2; Abd‑El‑Hadi A. Ammar3
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| 1Electronics Research Institute (ERI), Cairo 11843, Egypt. | ||||
| 2Electronics Research Institute (ERI), Cairo 11843, Egypt | ||||
| 3Electronics 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 | ||||
| Keywords | ||||
| Visible Light Communication; LED Driving Circuit; Fast Control System | ||||
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