Mémoire de Maîtrise
DOI
https://doi.org/10.11606/D.3.2010.tde-21122010-132451
Document
Auteur
Nom complet
Dwight José Cabrera Salas
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 2010
Directeur
Jury
Vale Neto, José Vieira do (Président)
Correra, Fátima Salete
Soares Junior, João Navarro
Titre en portugais
Automação e otimização do projeto de um oscilador controlável por tensão para aplicações em rádio frequência.
Mots-clés en portugais
Consumo de potência
Otimização
Programação geométrica
Ruído de fase
VCO
Resumé en portugais
Titre en anglais
Automation and optimization of a voltage controlled oscillator for radio frequency applications.
Mots-clés en anglais
Geometric programming
Optimization
Oscillator
Phase noise
Power consumption
VCO
Resumé en anglais
In this work the concepts and techniques related to the optimization and automation of the design of a controlled voltage oscillator intended for radio frequency applications are presented. The design problem of the oscillator was cast as a mathematical optimization problem known as geometric programming. As a first approach, the application of geometric programming in the design of a simple circuits was done. Thus, the advantages and limitations of the methodology were first reviewed and strategies to overcome theses problems were also presented. With a better understanding of the methodology, the formulation of the oscillator as a geometric program was presented. One of the most important requirements in the application of geometric programming in circuit design is the needed of device models suitable with the mathematical form of a geometric program. Thus, in this work the techniques used to obtain theses models for transistor and inductor parameters were presented. Using the proposed methodology, a VCO for the 2.4GHz ISM frequency band was designed in a standard 4 metals 0.35um CMOS technology. From simulations results, the VCO achieved a figure of merit of 180 dBc/Hz with a phase noise of -130dBc/Hz at 3MHz of offset frequency. A prototype of a VCO was fabricated and experimental tests were developed. From the obtained results good agreement with post layout simulations were observed.

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Date de Publication
2011-04-19

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