Methods of optimising power amplifier efficiency and closed-loop power amplifier controllers
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United States of America Patent
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Mar 9, 2004
Grant Date -
Jun 26, 2003
app pub date -
Dec 26, 2001
filing date -
Dec 26, 2001
priority date (Note) -
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Abstract
A significant part of the cost of a base station in the cellular mobile radio system is the power amplifier. Thus it is desirable to maximise usage of a power amplifier and in particular to gain the best power output from the amplifier or to improve its efficiency. Such power amplifiers, however, must operate within strict spectral boundaries and thus power amplifiers are typically over-specified in order to ensure that the spectral requirements are met. By measuring the output of the amplifier and determining distortion factors and then adaptively adjusting the operating characteristics of the amplifier, the degree of over-specification of the amplifier required may be reduced with consequent cost and environmental savings.
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