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Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC

Kassem, A; Darwazeh, I; (2020) Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC. In: Proceedings of the 2020 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE: Seville, Spain. Green open access

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Abstract

This work proposes and demonstrates the utility of a negative impedance converter (NIC) circuit, based on a common collector (CC) amplifier, for the generation of negative capacitance. The design principle of the proposed NIC is introduced, then a negative capacitance equals -200 pF is demonstrated using discrete devices constructed on a printed circuit board (PCB). The designed NIC is applied for the bandwidth extension of LEDs to enhance the achievable data rates in visible light communication (VLC) systems. The paper includes analytical derivations of the obtained negative capacitance as a function of circuit parameters and verifies this by both simulation and experimentally. Measurements show significant bandwidth extension by neutralising the bandwidth-limiting effect of the LED diffusion capacitance through the introduction of a parallel negative capacitance.

Type: Proceedings paper
Title: Demonstration of Negative Impedance Conversion for Bandwidth Extension in VLC
Event: 2020 IEEE International Symposium on Circuits and Systems (ISCAS)
ISBN-13: 9781728133201
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ISCAS45731.2020.9180468
Publisher version: https://doi.org/10.1109/ISCAS45731.2020.9180468
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Negative impedance converters, negative capacitance, light emitting diodes, visible light communication
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10131778
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