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Power amplifier model for optimizing battery current, interference, and link margin

The power amplifier consumes a large function of the total battery current used by a portable transceiver. The power amplifier's bias and input power can be adjusted to decrease battery current demands. These adjustments may introduce nonlinearities in the power amplifier gain that will increase out-of-channel power and decrease the link margin when variable envelope digital modulations are used. In this paper, the authors describe a portable transceiver power amplifier model, derived from measurements, that allows engineers to optimize battery current, out-of-channel interference and link margin. The models and approach presented in this paper are useful for assessing the electromagnetic compatibility of portable transceivers and receivers operating in adjacent bands.