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