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Nonideality sources and implementation considerations in polar transmitters

Published online by Cambridge University Press:  19 March 2009

José A. García ,
José C. Pedro ,
Pedro Miguel Cabral ,
Christian Fager ,
Hossein Mashad Nemati ,
Anding Zhu  and
Paolo Colantonio
José A. García*
Affiliation:
University of Cantabria, Santander, Spain. (Email: joseangel.garcia@unican.es)
José C. Pedro
Affiliation:
Institute of Telecommunications, University of Aveiro, Aveiro, Portugal. (Email: jcpedro@ua.pt and pcabral@ua.pt)
Pedro Miguel Cabral
Affiliation:
Institute of Telecommunications, University of Aveiro, Aveiro, Portugal. (Email: jcpedro@ua.pt and pcabral@ua.pt)
Christian Fager
Affiliation:
Chalmers University of Technology, Gothenburg, Sweden. (Email: christian.fager@chalmers.se and mashadne@chalmers.se)
Hossein Mashad Nemati
Affiliation:
Chalmers University of Technology, Gothenburg, Sweden. (Email: christian.fager@chalmers.se and mashadne@chalmers.se)
Anding Zhu
Affiliation:
University College Dublin, Dublin, Ireland. (Email: anding.zhu@ucd.ie)
Paolo Colantonio
Affiliation:
University of Roma Tor Vergata, Rome, Italy. (Email: paolo.colantonio@uniroma2.it)
*
Corresponding author: José A. García Email: joseangel.garcia@unican.es
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Abstract

In this paper, the main nonidealities appearing in polar transmitters will be addressed, together with several implementation considerations. Special attention will be paid to the role of AM modulation nonlinearity and parasitic AM-to-PM conversion, once architecture mechanisms such as time-delay mismatch between branches or limited bandwidth in the amplitude path are controlled. The device limiting factors for a highly efficient switched mode operation and a linear amplitude modulation will be identified. Some circuit design and implementation guidelines for the RF modulating stage and the envelope amplifier will be discussed, to finish with system-level analysis considerations under two-tone and real communication signal excitations.

Keywords

EfficiencyLinearityNonlinear distortionPolar transmittersPower amplifiersWireless systems
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 1 , Special Issue 2: TARGET , April 2009 , pp. 109 - 116
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2009

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References

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