Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2010.tde-21122010-132451
Document
Author
Full name
Dwight José Cabrera Salas
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Vale Neto, José Vieira do (President)
Correra, Fátima Salete
Soares Junior, João Navarro
Title in Portuguese
Automação e otimização do projeto de um oscilador controlável por tensão para aplicações em rádio frequência.
Keywords in Portuguese
Consumo de potência
Otimização
Programação geométrica
Ruído de fase
VCO
Abstract in Portuguese
Title in English
Automation and optimization of a voltage controlled oscillator for radio frequency applications.
Keywords in English
Geometric programming
Optimization
Oscillator
Phase noise
Power consumption
VCO
Abstract in English
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.