Efficiency improvement techniques at low power levels for linear CDMA and WCDMA power amplifiers

Author

Fowler, T. ; Burger, K. ; Nai-Shuo Cheng ; Samelis, A. ; Enobakhare, E. ; Rohlfing, S.

Author_Institution

Conexant Syst. Inc., Newbury Park, CA, USA

fYear

2002

fDate

3-4 June 2002

Firstpage

41

Lastpage

44

Abstract

Power amplifiers are significant contributors to current consumption within mobile phones resulting in continued focus on design techniques to improve power amplifier efficiency. The techniques presented here use variable bias current and supply voltage, which allow enhanced efficiency at low power levels, and variable load impedance, which provides tradeoffs for optimum linearity and efficiency as a function of power level and battery voltage.

Keywords

code division multiple access; mobile radio; power amplifiers; telephone sets; battery voltage; current consumption; design technique; efficiency; linear CDMA power amplifier; linear WCDMA power amplifier; linearity; mobile phone; power level; variable bias current; variable load impedance; variable supply voltage; Batteries; Current supplies; High power amplifiers; Linearity; Mobile handsets; Multiaccess communication; Power amplifiers; Power generation; Random variables; 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.2002.1011506

Filename

1011506