Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor

Free space optical front-end receiver usually suffers high photodetector input capacitance which limits the bandwidth of the system. This is due to the large detection area required to collect as much optical radiant power as possible to increase the system’s sensitivity. In this work, the bootstrap...

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Main Author:	Ramli, Arnidza
Format:	Thesis
Language:	English
Published:	2010
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/11260/6/ArnidzaRamliMFKE2010.pdf
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id	my-utm-ep.11260
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spelling	my-utm-ep.112602017-09-18T07:28:33Z Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor 2010-01 Ramli, Arnidza TK Electrical engineering. Electronics Nuclear engineering Free space optical front-end receiver usually suffers high photodetector input capacitance which limits the bandwidth of the system. This is due to the large detection area required to collect as much optical radiant power as possible to increase the system’s sensitivity. In this work, the bootstrap transimpedance amplifier (BTA) is adopted as an alternative approach for free space optical front-end receiver design. This technique offers the usual advantages of the transimpedance amplifier (TIA) together with the effective capacitance reduction technique. An improved photodetector model and the both front-end structures; TIA and BTA have been simulated using harmonic balance technique offers by Microwave Office, and the results show that the design improves the system bandwidth by 6.7 times in average. However, the performance of the BTA was found limited to a certain photodetector input capacitance. In order for the front-end structure to adapt with various photodetectors capacitance, MEMS variable capacitor (varicap) is introduced as a tunable feedback element for the bootstrap loop for an optimum performance. The MEMS varicap have been designed and modeled using CoventorWare and found to be practical for circuit implementation. The implementation of MEMS varicap with the design BTA optical front-end receiver was verified using the CoventorWare ARCHITECT. The simulation of the BTA employing MEMS variable capacitor as the feedback capacitor shows the improvement in bandwidth by 1.04 times in average for various photodetector input capacitance. 2010-01 Thesis http://eprints.utm.my/id/eprint/11260/ http://eprints.utm.my/id/eprint/11260/6/ArnidzaRamliMFKE2010.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Ramli, Arnidza Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
description	Free space optical front-end receiver usually suffers high photodetector input capacitance which limits the bandwidth of the system. This is due to the large detection area required to collect as much optical radiant power as possible to increase the system’s sensitivity. In this work, the bootstrap transimpedance amplifier (BTA) is adopted as an alternative approach for free space optical front-end receiver design. This technique offers the usual advantages of the transimpedance amplifier (TIA) together with the effective capacitance reduction technique. An improved photodetector model and the both front-end structures; TIA and BTA have been simulated using harmonic balance technique offers by Microwave Office, and the results show that the design improves the system bandwidth by 6.7 times in average. However, the performance of the BTA was found limited to a certain photodetector input capacitance. In order for the front-end structure to adapt with various photodetectors capacitance, MEMS variable capacitor (varicap) is introduced as a tunable feedback element for the bootstrap loop for an optimum performance. The MEMS varicap have been designed and modeled using CoventorWare and found to be practical for circuit implementation. The implementation of MEMS varicap with the design BTA optical front-end receiver was verified using the CoventorWare ARCHITECT. The simulation of the BTA employing MEMS variable capacitor as the feedback capacitor shows the improvement in bandwidth by 1.04 times in average for various photodetector input capacitance.
format	Thesis
qualification_level	Master's degree
author	Ramli, Arnidza
author_facet	Ramli, Arnidza
author_sort	Ramli, Arnidza
title	Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
title_short	Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
title_full	Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
title_fullStr	Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
title_full_unstemmed	Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
title_sort	free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2010
url	http://eprints.utm.my/id/eprint/11260/6/ArnidzaRamliMFKE2010.pdf
_version_	1747814832787161088

Free space optical front-end receiver’s bandwidth enhancement employing micro-electro mechanical systems variable feedback capacitor

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