Title :
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
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;
Conference_Titel :
Microwave Conference, 2006. 36th European
Conference_Location :
Manchester
Print_ISBN :
2-9600551-6-0
DOI :
10.1109/EUMC.2006.281328
