Design of a Novel Transistor and a Microwave Pallet & Testing of a Novel Power Amplifier

100 Pages·2012·3.8 MB·English

Design of a Novel Transistor and a
Microwave Pallet
&
Testing of a Novel Power Amplifier

PRIYAM RASTOGI

Master of Science Thesis
Stockholm, Sweden 2012
Design of a Novel Transistor and a
Microwave Pallet
&
Testing of a Novel Power Amplifier

Priyam Rastogi
[email protected]

Examiner: Prof. Li-Rong Zheng
Supervisor: Zhuo Zou
Kungliga Tekniska Högskolan
Stockholm, Sweden

Supervisor: Freek Van Straten
NXP Semiconductors B.V
Nijmegen, The Netherlands

Master of Science Thesis
KTH,ICT Department of Electronic System
SE-164 40 STOCKHOLM

SAMMANFATTNING
Radiofrekvens baserad teknik har utlöst ett stort område inom forskning och utveckling. Denna
avhandling arbete bygger på RF krafttransistorer och deras sedvänjor i olika tillämpningar.
Traditionellt har RF-transistorer som används i applikationer basstationer. Men nu är de som
används i nya applikationer som mikrovågstillämpningar, medicinsk utrustning, energikällor för
kapning av trä, torkning kläder och för offentlig belysning. Därför designa RF transistorer krävs
för att göra dem lämpliga för deras nya program. Avhandlingen fokuserar på att bygga mycket
effektiva och billigt RF transistorer och RF förstärkare genom omkonstruktion flera avsnitt av
dem. Rapporten är indelad i tre sektioner.

Den första delen beskriver en ny RF-transistor från design till slutlig testfas. Förpackningen stil
nya RF-effekttransistor modifieras genom att använda olika material för att göra förpackningar
enklare och tillverkningsprocess mer effektiv. Den modifierade RF-transistorn visade positiva
resultat, medan testning som styrker möjligheten att använda det nya paketet för RF-transistor.

Den andra delen av rapporten beskriver en mikrovågsugn pall omdesignad genom att anpassa
transistorn byggd i det första avsnittet. Detta omkonstruktion har en extra fördel av enkelhet,
färre steg tillverkning och låg kostnad. Denna mikrovågsugn pall har en bandbredd på drift från
2900MHz till 3300MHz. Liknande till transistorn har mikrovågsugn pall förpackningen stil
omgjorda utan att påverka dess elektriska beteende. Pallen visade positiva resultat, medan
testning, vilket visar på genomförbarheten av denna nya design.

Den sista delen av rapporten beskriver testning av en ny effektförstärkare. Syftet med detta test
var att observera effekten på olika delar av effektförstärkaren under avlägsnande av cirkulatorn
från det. Testet utfördes för att minska kostnaderna och storleken hos effektförstärkaren. Testet
var inte helt lyckad indikerar behovet av omkonstruktion effektförstärkaren. Arbetet som
presenteras i denna rapport representerar inledande forskning som behöver omfattande granskas i

framtiden att minska kostnaderna och tillverkning tiden för RF-produkter.

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ABSTRACT
Radio frequency based technology has unleashed a vast area in research and development. This
thesis work is based on RF power transistors and their usages in different applications.
Traditionally, RF transistors were used in base station applications. But now, they are being used
in new applications like microwave applications, medical equipment, energy sources for cutting
wood, drying clothes, and street lighting systems. Hence redesign of RF transistors is required to
make them suitable for their new applications. The thesis work focuses on building highly
efficient yet cheap RF transistors and RF amplifiers by redesigning several sections of them.
This report is divided into three sections.
The first section describes a novel RF transistor from design to final testing phase. The
packaging style of the new RF power transistor is modified by using different material to make
packaging process simpler and manufacturing process more efficient. The modified RF transistor
showed positive results while testing, thus proving the feasibility of using the new package for
RF transistor.
The second section of the report describes a microwave pallet redesigned by adapting the
transistor built in the first section. This redesigning has an added advantage of simplicity, fewer
manufacturing steps, and low cost. This microwave pallet has a bandwidth of operation from
2900MHz to 3300MHz. Similar to the transistor, the microwave pallet packaging style was
redesigned without affecting its electrical behavior. The pallet showed positive results while
testing, thus proving the feasibility of this new design.
The last section of the report describes the testing of a novel power amplifier. The aim of this test
was to observe the effect on various parts of the power amplifier while removing the circulator
from it. The test was performed to reduce the cost and size of the power amplifier. The test was
not completely successful indicating the need for redesigning the power amplifier. The work
presented in this report represents initial research that needs to be extensively examined in the
future to reduce the cost and manufacturing time of the RF products.

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FOREWORD
I would like to express my gratitude to some of the people without whose help and support I
would not have successfully completed my thesis work. Foremost I would like to sincerely thank
my supervisor in NXP, Freek Van Straten who was there with me in each and every step of my
thesis work. Without his guidance and support it would have been impossible to complete my
work within the given time. His patience to my mistakes and freedom for the decisions helped
me a lot to enhance both my personal and professional personality. Along with him I would like
to thank my examiner Dr. Li-Rong Zheng who gave me the opportunity to do the master thesis in
my university. This opportunity was a great support as without it all my work would have been
in vain.
I would also like to thank my supervisor in KTH, Zhuo Zou who helped me from the process of
registration to the final presentation of the thesis work. He made my thesis work smooth even
when I was doing my thesis miles away from my university. I would also like to thank my course
coordinator May-Britt Eklund-Larson who supported me in each and every administration work
and made my stray in Netherlands comfortable.
I would like to express my gratitude to Paul Hunneman, Huub Keultjes, Hans Marijnissen, Robin
Stenfert, and Tennyson Nguty, in NXP Semiconductor for their ever ready help and guidance in
different steps of my thesis work. They made my thesis work done rapidly without any
hindrance.
I am extremely grateful to my family for their unconditional love, support and inspiration
without which it would have been difficult to complete this work as this spirit.
Last but not least I would like to thank god who is always there with me in every second of my
life.
Priyam Rastogi
Nijmegen, September and 2012

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ABBREVIATIONS

ADS Advance Design System
BJT Bipolar Junction Transistor
DC Direct Current
ESD Electrostatic Discharge
FM Frequency Modulation
HTCC High Temperature Cofired Ceramic
IR Infra Red
LDMOS Laterally Diffused Metal Oxide Semiconductors
MRI Magnetic Resonance Imaging
PA Power Amplifier
PCB Printed Circuit Board
RADAR Radio Detection and Ranging
RF Radio frequency
SMD Surface Mount Device
UHF Ultra High Frequency
VHF Very High Frequency

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