Design and simulation of high performance RF CMOS power amplifiers
Other Title(s)
تصميم و محاكاة مضخمات قدرة راديوية التردد نوع CMOS عالية الأداء
Dissertant
Thesis advisor
Abd al-Wahhab, Mutazz Shunasi
Ali, Ali Abbas
Comitee Members
Fayyd, Rad Sami
Hulw, Husayn Waryush
al-Rabii, Muhammad Husayn
Jumah, Husayn
Aziz, Jabir Salman
Akkar, Hanan Abd al-Rida
University
University of Technology
Faculty
-
Department
Department of Electrical Engineering
University Country
Iraq
Degree
Ph.D.
Degree Date
2007
English Abstract
Several techniques are under consideration for the next generation of wireless communication systems, with the aim of improving amplifier efficiency, linearity, and power gain.
However achieving high efficiency and high linearity of RF Power Amplifier (PA) simultaneously is the most challenging problem.
To overcome the limitations of existing techniques, it is desirable to develop better efficiency and linearity enhancement schemes with low cost. This thesis investigates the design of a monolithic CMOS RF PA for wireless communication.
Three different PAs circuits are designed, implemented and tested using "Microwave Office" version 3.22 package, which can be applied for the optimum performance of high efficient linear PA requirements.
The first 3-stages PA is targeted to operate with power gain of 30dB suitable for WLAN applications, the amplifier is capable of delivering a maximum output power of 17.8dBm at 2.4GHz; using a 3V supply with a power added efficiency (PAE) of 29.4%. This work introduces a suitable interstage matching network that enables an integration of the entire CMOS PA implementation, overcome the high insertion loss problem in on-chip PA, provides interstage coupling and drives inductive tuning. This work proposes new classes, namely class AB/F and class AB/Inverse F, that achieve an efficient, high linearity CMOS RF PA with a simple tuning scheme and low cost.
It is developed using the concept of gate biasing adjustment and higher harmonic traps, to minimize the nonlinearity and power dissipation respectively.
This concept has been further implemented in designing the second 2.4GHz linear power amplifier in CMOS process.
The design illustrates a compact integration of a power amplifier as an efficiency enhancement scheme that also helps improve linearity.
A power gain of 32.2dB and output power of 19.2dBm are achieved by redesign the first three-stages WLAN PA using the proposed hybrid class AB/F to provide PAE of 43.4%.
The proposed class AB/F provides 1-dB compression output power of 17.2dBm at - 21.7dBm input power.
This point represents high linearity improvement compared with that of classical mode of class F. Also in this work, new general equations for the "multistage Doherty amplifier," are derived to extend the efficiency improvement capability beyond the classical design.
This work presents a thorough analysis of the multistage Doherty power amplifier, many performance improvement issues and an implementation of a four stages Doherty power amplifier system with significant efficiency enhancement at backed-off conditions to meet the WLAN standard specifications. Third PA design based on the proposed 4-stages Doherty output stage achieved a power gain above 33dB with an output power of 20.4dBm at 2.4GHz, PAE of 47.1% and 1-dB compression output power of 21dBm.
In the 4-stages Doherty output stage there is a PAE improvement of 1.6 times, 2.25 times, and 2.99 times at 6dB back off, 12dB back off, and 18dB back off respectively, compared to a single output stage class AB designed in first PA. The linearity tradeoff with efficiency is relaxed by utilizing one of the key properties of the multistage Doherty PA, which is the fact that all building amplifiers operate in different classes. In order to minimize the inherently high substrate loss and increase level of integration for the implementation of the multistage Doherty amplifier in CMOS processes, the quarter-wave transformer is substituted by their lumped equivalents.
In this design, passive pi network is used.
Main Subjects
Electronic engineering
Information Technology and Computer Science
No. of Pages
168
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction and literature survey.
Chapter Two : Power amplifier fundamentals.
Chapter Three : Study and analysis of power amplifier enhancement techniques.
Chapter Four : Stages power amplifier design for wireless local area network.
Chapter Five : Stages WLAN PA design with a proposed class AB / F.
Chapter Six : The proposed multistage doherty amplifier.
Chapter Seven : Conclusions and future works.
References.
American Psychological Association (APA)
Rahimah, Mithaq Nimah. (2007). Design and simulation of high performance RF CMOS power amplifiers. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-748141
Modern Language Association (MLA)
Rahimah, Mithaq Nimah. Design and simulation of high performance RF CMOS power amplifiers. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2007).
https://search.emarefa.net/detail/BIM-748141
American Medical Association (AMA)
Rahimah, Mithaq Nimah. (2007). Design and simulation of high performance RF CMOS power amplifiers. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-748141
Language
English
Data Type
Arab Theses
Record ID
BIM-748141
