Power-amplifier module with digital adaptive predistortion for cellular phones

Author

Kusunoki, Shigeo ; Yamamoto, Katsuya ; Hatsugai, Tadanaga ; Nagaoka, Hiroaki ; Tagami, Kenshi ; Tominaga, Naoto ; Osawa, Kanji ; Tanabe, Ken ; Sakurai, Satoshi ; Iida, Tetsuya

Author_Institution

Sony Ericsson Mobile Commun. Japan Inc, Tokyo, Japan

Volume

50

Issue

12

fYear

2002

fDate

12/1/2002 12:00:00 AM

Firstpage

2979

Lastpage

2986

Abstract

This paper describes a new type of power amplifier (PA) module with a predistortion function and can be applied to a N-CDMA (narrow-band CDMA system defined in IS-95B Standard) handset terminals. Distortion compensation technology to improve the efficiency of the PA is discussed, quantitatively. Various parameters to be considered in designing are investigated in detail. The predistortion technology proposed is based on the lookup-table method using the input and output signal envelopes and can operate independently from the baseband block. By omitting adaptative predistortion for amplitude/phase modulation and integrating the main controlling functions on a single CMOS integrated-circuit chip, the predistortion capability has been realized in a PA module. The PA module has a power-added efficiency (PAE) of 48% at an output power of 27.5 dBm. This PAE is very high in comparison with that of the conventional PA module for N-CDMA.

Keywords

CMOS digital integrated circuits; UHF power amplifiers; adaptive signal processing; code division multiple access; compensation; distortion; mobile handsets; modules; table lookup; 48 percent; AM/AM; AM/PM; CMOS chip; IS-95B standard; N-CDMA handset terminals; amplitude-amplitude modulation; amplitude/phase modulation; cellular phones; code division multiple access; control functions; digital adaptive predistortion; distortion compensation technology; input signal envelopes; lookup-table method; narrow-band CDMA system; output signal envelopes; power amplifier efficiency; power amplifier module; power-added efficiency; Baseband; CMOS technology; Cellular phones; Multiaccess communication; Narrowband; Phase modulation; Power amplifiers; Power generation; Predistortion; Telephone sets;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2002.805137

Filename

1098021