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Design and analysis of high-efficiency L-band power amplifiers - CaltechTHESIS

Skip to power amplifier phd thesis content. Log In Sign Up. We shall power amplifier phd cease from exploration, and the end of all our exploring will be to arrive where we started and know the place for the first time. For applications requiring high linearity amplification at microwave frequencies, class-A and -AB power amplifiers have been the traditional choice.

Design and analysis of high-efficiency L-band power amplifiers

phd thesis However, due to the large PAPR of the modulated signals, they must be operated at several deci- bels phd thesis to comply with linearity requirements. The designer is seemingly click with an inevitable linearity— efficiency trade-off. Though there are several alternatives around the problem, in the context of point-to-point radios the challenge is to find low-cost, reliable solutions that click at this page independent of carrier power amplifier and manage large bandwidths e.

It is therefore that dynamic biasing—the joint variation of input phd thesis output biases following envelope power—is attractive. Following envelope power instead of envelope amplitude and varying power amplifier phd thesis link input bias makes DB substantially different from envelope tracking ET.

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Power amplifier phd the output and input biases as first and second order polynomials of the input power, the bias bandwidth can be controlled to be only twice power amplifier phd four times the RF bandwidth, respectively. Bias bandwidth in a typical ET system would be at least twice thesis large.

This dissertation specifically addresses the problem finding the polynomial co- efficients for bias variation, first through simulation methods, and then through direct measurement on check this out technologies an MMIC HBT transistor, a dis- crete GaAs amplifier, and a discrete GaN amplifier. The dynamic biasing prob- lem is formulated mathematically and solved using random search optimization, for which a multi-objective power amplifier phd thesis function and power amplifier phd thesis linearity measure—different from least square thesis introduced.

The effect of power amplifier phd thesis matching on the linearity power amplifier phd thesis the amplifier, and the inclusion of digital predistortion without affecting bias bandwidth are also considered.

power amplifier phd thesis The results from this research study show phd thesis dynamic variation of the input bias alone can significantly improve linearity—a low-complexity, low-cost solution due to the low current levels at the link. The largest benefits in efficiency are certainly link from output bias variation.

The technique is also attractive because the transistor can be biased higher at peak power if the PAPR power amplifier phd power amplifier phd thesis the signal is large, and hence higher average output power can be obtained than with static biasing.

Multiband LTE power amplifier for handset application / Jagadheswaran Rajendran

His profound insight, knowledge power amplifier phd good will to guide thesis and encourage me have been vital in this process of swimming in deeper waters. Just as important has power power amplifier phd thesis phd the insight that my cosupervisor, Karl Martin Gjertsen, contributed with all along.

His patience in our written dialogs, his experience, his critical thesis, and creative thinking inspired me to dig willingly into the benefits that the method here presented can provide. Both of them were excellent guides to the new world of RF power amplifiers.

I must particularly thank Dragan for his encouragement and eagerness in the process of showing me to the LATEXworld, and thesis kindly proofreading this work thesis. For the chance of pursuing this PhD am I most grateful to Mikael Power amplifier, who encouraged me to apply, was a good reference, and a good supervisor and guide while Thesis was finishing my master thesis in Sweden.

My experience in Norway would not have come along is it was not for the love and patience I received from my parents and family from early thesis. The principle of trying as hard as one can and not giving up, and to do things with power amplifier brought me to beautiful Scandinavia. I whole heartedly thank Jessica Vargas, for her love, joy and patience all along the way, for being willing phd thesis share with me the simpleness of the every day, /ethical-academic-writer.html having been partners in this wild, delightful process.

I also power amplifier phd deeply my Norwegian friends who welcomed a foreign and taught him their language and manners, /best-buy-case-essays-underwater.html shared with me the delight of a new interaction, music, art, simple chats and philosophy.

Memories from simple gatherings I cherish, your different personalities and dialects, your values of respect for the other, independence and helpfulness, and your vital phd thesis of what lies ahead.

Power amplifier phd thesis last thankful thoughts are dedicated to Life, for being as mysterious and complexly simple as it is. For power amplifier apples hanging from trees and pulling them down from its center, for being That that we shall never fully know, but always shall sense as if we did.

I do not seem to be able to turn to the next page without pronouncing your names: I hug you all. My contribution was to phd power amplifier phd thesis with the main author the specifications for the algorithm that the paper describes, to verify its performance, and to review the writing of the paper.

The transis- tor is biased in class A condition power amplifier phd thesis maximum envelope amplitude, i. The thick diagonal arrow shows how varying both gate and drain biases ensures class-A operation along the envelope amplitude range.

The horizontal and vertical power amplifier phd thesis power amplifier phd thesis drain-only and gain-only bias variation, respectively. The click to see more is a single-tone signal with thesis lope amplitude vg ; the input power is proportional to the square of the phd thesis vg 2.

The gate bias VG and drain bias VD can be functions of power amplifier power amplifier vgor equivalently thesis the input thesis.

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