Comprehensive analysis of a Bridget-T pre-equalizer circuit for high-speed visible light communications

Mohd Nor, Norhanis Aida and Abdul Aziz, Siti Hajar and Ahmad Zabidi, Suriza (2025) Comprehensive analysis of a Bridget-T pre-equalizer circuit for high-speed visible light communications. IIUM Engineering Journal, 26 (1). pp. 205-216. ISSN 1511-788X E-ISSN 2289-7860

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Abstract

This paper presents a comprehensive analysis of a bridged-T equalizer circuit (BTEC) designed for a high-speed visible light communications (VLC) system. The circuit is proposed to overcome the bandwidth limitation of light-emitting diodes (LEDs) in the VLC system. The advanced design system (ADS) and MATLAB were integrated to analyze the behavior of the BTEC in terms of transfer functions and scattering parameters S11, S12, S21, and S22. The results indicate a good correlation between the two tools, with the center frequency being 786 MHz. The 3-dB lower and upper cut-off frequencies are 501 MHz and 1.23 GHz, respectively. The impedance point is at magnitude 1 and 0 phase degrees on the Smith chart. This precise point ensures optimal matching to 50 Ω of source and load impedance. This simulation proves that the bridged-T pre-equalizer circuit is a symmetric and reciprocal network since S11 = S22 and S12 = S21. This work combines the computational capabilities of MATLAB with the circuit simulation capabilities of ADS, which satisfied the pre-equalizer circuit experimental stage.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Bridged-T circuit, Pre-equalizer, VLC, Scattering parameter, Two-port networks, and ADS/ MATLAB
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices > TK7885 Computer engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Electrical and Computer Engineering Kulliyyah of Engineering > Department of Science
Depositing User:	Dr Norhanis Aida Mohd Nor
Date Deposited:	16 Jan 2025 15:53
Last Modified:	16 Jan 2025 15:53
URI:	http://irep.iium.edu.my/id/eprint/118619

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