Title :
Switched Doherty Power Amplifiers for CDMA and WCDMA
Author :
Apel, Thomas ; Tang, Yu-Lung ; Berger, Otto
Author_Institution :
Triquint Semicond., Hillsboro
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;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
1-4244-0530-0
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2007.380878
