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Behavioural modelling of amplifier asymmetry in the time domain
Author(s) -
Jang W.,
Kriplani N. M.,
Steer M. B.
Publication year - 2012
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1002/jnm.1842
Subject(s) - amplifier , transient (computer programming) , baseband , rf power amplifier , nonlinear system , asymmetry , computer science , electronic engineering , frequency domain , time domain , power (physics) , radio frequency , scaling , electrical engineering , physics , telecommunications , engineering , bandwidth (computing) , mathematics , geometry , quantum mechanics , computer vision , operating system
SUMMARY Power amplifier asymmetry is captured by a behavioural model that contains multiple slices representing the amplifier's nonlinearity and long‐term, that is low frequency, memory. The simulation is performed entirely in the time domain, and the expense associated with performing a purely transient radio frequency (RF) simulation is circumvented by scaling down the carrier frequency by two orders of magnitude. This leads to a manageable transient simulation with results scaling back to the original carrier frequency. The model is empirical and can be easily implemented in any general purpose circuit simulation environment. The baseband portion of the model parameters was extracted and the simulation result was compared with measurement, thereby demonstrating that a nonlinear and accurate transient analysis routine can be effectively employed to capture memory‐related RF power amplifier phenomena. Copyright © 2012 John Wiley & Sons, Ltd.