Projeto de filtros tipo "só-pólo" para malhas de sincronismo de fase de alta frequência. / Design of all-pole filters for high frequency phase locked loops.

AUTOR(ES)

Ricardo Bressan Pinheiro

DATA DE PUBLICAÇÃO

2010

RESUMO

The evolution of communication systems is discussed, with emphasis on optical technology. Special consideration is given to the continuous need for increasing the capacity of such systems, and the impact over future optical communication. In view of the great demands imposed over the capacity of future optical systems, an overview is presented of two recent proposals found in the literature, one of such proposals being the implementation of a generator of short optical pulses, and the other being a clock extractor device realized through the use of optical techniques. A brief review is made of phase-locked loop (or PLL) theory, to show how the discussed proposals could be used to realize tipical functions found in these systems. The very high loop gains (the so-called parameter K) that must be used in PLLs of optical communication systems are emphasized. After discussion of the necessary characteristics for PLLs of future optical systems, and also after a review of some concepts of the theory of electrical networks and filters, two design procedures for filters to be used in such PLLs are presented. Both designs have the goal of allowing the use of loop filters with any type and order. The first type of design has the objective to realize a PLL transfer function that has a frequency response identical to the response of a chosen type of filter. The other design starts with a chosen type of filter for a PLL loop filter, arriving to an suitable PLL transfer function. Some algorithms for determination of important design parameters are also presented. After the discussion of the two types of design, some examples of PLLs obtained by such methods are presented. For each example, frequency response curves are presented for the PLL and the respective loop filter, as well as the root locus and the capture response for the PLL so obtained. The capture process was studied through the use of simulations with parameters intended to approximate real implementation conditions, although noise effects are not considered. Finally, some possible research lines are discussed, whose main focus is on filters with finite poles and zeros.

ASSUNTO(S)

control systems electric filters filtros elétricos malha de sincronismo de fase optical communication systems phase-locked loops rede de telecomunicações sistema de comunicação óptica sistemas de controle telecomunication network

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