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Feedback linearization of RF power amplifiers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Feedback linearization of RF power amplifiers.
作者:	Dawson, Joel Lawrence.
面頁冊數:	173 p.
附註:	Adviser: Thomas H. Lee.
附註:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4518.
Contained By:	Dissertation Abstracts International64-09B.
標題:	Engineering, Electronics and Electrical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3104217
ISBN:	0496517856

Feedback linearization of RF power amplifiers.
Dawson, Joel Lawrence.

Feedback linearization of RF power amplifiers. [electronic resource] - 173 p.

Adviser: Thomas H. Lee.

Thesis (Ph.D.)--Stanford University, 2003.

Designers of RF power amplifiers (PA's) for modern wireless systems are faced with a difficult tradeoff. On one hand, the PA consumes the lion's share of the power budget in most transceivers. It follows that in a cellular phone, for example, battery lifetime is largely determined by the power efficiency of the PA. On the other hand, it may be desirable to have high spectral efficiency---the ability to transmit data at the highest possible rate for a given channel bandwidth. The design conflict is that while spectral efficiency demands a highly linear PA, power efficiency is maximized when a PA is run as a constant-envelope, nonlinear element. The current state of the art is to design a moderately linear PA and employ some linearization technique. The amplifier operates as close to saturation as possible, maximizing its power efficiency, and the linearization system maximizes the spectral efficiency in this near-saturated region.

ISBN: 0496517856Subjects--Topical Terms:

226981
Engineering, Electronics and Electrical.

Feedback linearization of RF power amplifiers.
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502 $a Thesis (Ph.D.)--Stanford University, 2003.
520 # $a Designers of RF power amplifiers (PA's) for modern wireless systems are faced with a difficult tradeoff. On one hand, the PA consumes the lion's share of the power budget in most transceivers. It follows that in a cellular phone, for example, battery lifetime is largely determined by the power efficiency of the PA. On the other hand, it may be desirable to have high spectral efficiency---the ability to transmit data at the highest possible rate for a given channel bandwidth. The design conflict is that while spectral efficiency demands a highly linear PA, power efficiency is maximized when a PA is run as a constant-envelope, nonlinear element. The current state of the art is to design a moderately linear PA and employ some linearization technique. The amplifier operates as close to saturation as possible, maximizing its power efficiency, and the linearization system maximizes the spectral efficiency in this near-saturated region.
520 # $a There are many different linearization techniques. Our work focuses on Cartesian feedback systems for two main reasons: (1) because they employ analog feedback, the requirement for a detailed nonlinear model of the PA is greatly relaxed; (2) they automatically and elegantly compensate for process variations, temperature fluctuations, and aging. Nevertheless, historically the technique has suffered the practical shortcoming of relying on synchronous downconversion, which has been difficult to realize without manual trimming. This problem, combined with the recent trend toward fully monolithic systems, has caused Cartesian feedback to languish for years as little more than an academic curiosity.
520 # $a We have solved the synchronous downconversion problem with a new, nonlinear, analog phase alignment regulator. What this enables, for the first time, is a fully integrated Cartesian feedback system that can function with an absolute minimum of trimming. The focus of this work is a prototype IC, complete with power amplifier, phase alignment regulator, and Cartesian feedback circuitry, fabricated in National Semiconductor's 0.25mum CMOS process.
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