An overview of efficiency enhancements with application to linear handset power amplifiers

Author

Staudinger, J.

Author_Institution

Semicond. Products Sector, Motorola Inc., Tempe, AZ, USA

fYear

2002

fDate

3-4 June 2002

Firstpage

45

Lastpage

48

Abstract

A consequence of high spectral efficiency provided by second and third generation cellular systems is the requirement for linear power amplifiers in the transmitter unit of the mobile handset. The battery nature of the mobile phone emphasizes high amplifier efficiency for extending talk time and battery life. This represents an inherent trade-off between amplifier efficiency and linearity. Recent efforts have focused on considering alternative approaches with the goal of improving the efficiency/linearity performance trade-off compared to traditional single-ended Class A/B topologies. Some alternative approaches are examined here.

Keywords

HEMT integrated circuits; UHF integrated circuits; UHF power amplifiers; cellular radio; code division multiple access; telephone sets; GaAs PHEMT based amplifier; IS-95 CDMA systems; W-CDMA systems; amplifier efficiency; amplifier linearity; battery life; efficiency/linearity performance trade-off; envelope following amplifier; envelope tracking; high spectral efficiency; linear power amplifiers; mobile handset transmitter unit; overview; second generation cellular systems; talk time; third generation cellular systems; two-stage GaAs HEMT IC; High power amplifiers; Linearity; Power amplifiers; Power generation; RF signals; Radio frequency; Radiofrequency amplifiers; Semiconductor optical amplifiers; Telephone sets; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2002 IEEE

Conference_Location

Seattle, WA, USA

ISSN

1529-2517

Print_ISBN

0-7803-7246-8

Type

conf

DOI

10.1109/RFIC.2002.1011507

Filename

1011507