A Switch-Type Power Amplifier and Its Application to a CDMA Cellphone

Author

Kawakami, K. ; Kusunoki, S. ; Kobayashi, T. ; Hashizume, M. ; Shimada, M. ; Hatsugai, T. ; Koimori, T. ; Kozakai, O.

Author_Institution

Sony Ericsson Mobile Commun. Japan, Inc., Tokyo

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

348

Lastpage

351

Abstract

To address the demand for miniaturization and low cost in a cellphone, we aimed to eliminate the isolator and DC-DC converter. We propose a novel switch-type power amplifier (PA) using a strong junction PHEMT (JPHEMT) PA instead of HBT from the point of view of the performance under load-impedance variation. In high output power mode, the performance of this PA is the same as that of the conventional PA. In low output power mode, it operates as a single-stage PA and satisfies distortion characteristics without causing deterioration of efficiency

Keywords

HEMT integrated circuits; UHF power amplifiers; cellular radio; code division multiple access; CDMA cellphone; JPHEMT PA; distortion characteristics; load-impedance variation; single-stage power amplifier; strong junction PHEMT; switch-type power amplifier; Cellular phones; Costs; DC-DC power converters; FETs; Heterojunction bipolar transistors; Isolators; Multiaccess communication; Power amplifiers; Power generation; Power semiconductor switches; CDMA; DC-DC converter; JPHEMT; isolator; power amplifier;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281328

Filename

4057821