Switched Doherty Power Amplifiers for CDMA and WCDMA

Author

Apel, Thomas ; Tang, Yu-Lung ; Berger, Otto

Author_Institution

Triquint Semicond., Hillsboro

fYear

2007

fDate

3-5 June 2007

Firstpage

259

Lastpage

262

Abstract

Power amplifiers for CDMA and WCDMA applications must provide competitive power efficiency at low power levels as well as at full power. This paper presents a novel approach that utilizes a modified Doherty architecture as a solution to this problem. PA ICs in both cellular and PCS bands are presented. Typical performance is -50 dBc ACPR at PAE levels of 40% in high power mode (+28 dBm) and 21% in low power mode (+16.5 dBm). Design methodology, new cell geometry and manifold are also discussed.

Keywords

code division multiple access; heterojunction bipolar transistors; power amplifiers; radiofrequency amplifiers; CDMA system; PCS bands; WCDMA system; cellular PA chips; cellular bands; fishbone base HBT geometry; heterojunction bipolar transistors; modified Doherty architecture; switched Doherty power amplifiers; Delay lines; Heterojunction bipolar transistors; Impedance; Inverters; Multiaccess communication; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Semiconductor optical amplifiers; Voltage; Doherty; HBT; Heterojunction bipolar transistors; Linear integrated circuits; MMIC power amplifiers; Power amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE

Conference_Location

Honolulu, HI

ISSN

1529-2517

Print_ISBN

1-4244-0530-0

Electronic_ISBN

1529-2517

Type

conf

DOI

10.1109/RFIC.2007.380878

Filename

4266426