Increasing the talk-time of mobile radios with efficient linear transmitter architectures

Author

Mann, S. ; Beach, M. ; Warr, P. ; McGeehan, J.

Author_Institution

Dept. of Electr. & Electron. Eng., Bristol Univ., UK

Volume

13

Issue

2

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

65

Lastpage

76

Abstract

Power efficiency of the RF transmitter stage in mobile handsets has a direct impact on battery capacity as well as talk-time between battery recharge cycles. Unfortunately the power amplifier (PA) linearisation methods in common usage today to meet the linearity specification of standards such as GSM EDGE, TETRA and UMTS result in low DC to RF efficiency. This paper discusses the relationship between linearity and transmitter efficiency and reviews various linearisation schemes: Cartesian loop, polar loop, 2nd harmonic injection, envelope elimination and restoration (EER), predistortion methods, and synthesis techniques (e.g. LINC and CALLUM). The paper also shows that to increase the power efficiency (and thus talk-time) hybrid solutions to power amplifier linearisation are required and these are also discussed

Keywords

cellular radio; linear network synthesis; linearisation techniques; power amplifiers; radio transmitters; radiofrequency amplifiers; telecommunication standards; 2nd harmonic injection; CALLUM; Cartesian loop; DC to RF efficiency; GSM EDGE; LINC; RF transmitter; TETRA; UMTS; battery capacity; battery recharge cycles; efficient linear transmitter architectures; envelope elimination; envelope restoration; hybrid solutions; mobile handsets; mobile radios; polar loop; power amplifier linearisation methods; power efficiency; predistortion methods; standards linearity specification; synthesis techniques; talk-time; transmitter efficiency;

fLanguage

English

Journal_Title

Electronics & Communication Engineering Journal

Publisher

iet

ISSN

0954-0695

Type

jour

DOI

10.1049/ecej:20010204

Filename

920678