Title :
A multi-mode envelope tracking power amplifier for software defined radio transmitters
Author :
Kim, Bumman ; Choi, Jinsung ; Kang, Daehyun ; Kim, Dongsu
Author_Institution :
Dept. of Electr. Eng., Pohang Univ. of Sci. & Technol., Pohang, South Korea
Abstract :
A multi-mode envelope tracking power amplifier is presented for software defined and cognitive radio solutions. A new 0.13 um CMOS hysteretic-controlled hybrid switching supply modulator is developed for the mode dependent operation of the power supply modulator. Combined with 1.88 GHz HBT class-AB/F PA operating with novel envelope shaping method, the proposed envelope tracking power amplifier shows high efficiency and linearity over broad output power range. It achieves the PAE of 45/46/34.3% at the average output power of 27.8/29/23.9 dBm for EDGE/WCDMA/Mobile-WiMax, respectively, while satisfying the linearity specification without any digital pre-distortion technique. There are about 7% and 3% improvements of the overall PAE for EDGE and WCDMA, respectively, through the adaptive multi-mode operation.
Keywords :
3G mobile communication; CMOS integrated circuits; WiMax; code division multiple access; cognitive radio; modulators; power amplifiers; radio transmitters; software radio; telecommunication switching; tracking; CMOS hysteretic-controlled hybrid switching supply modulator; EDGE; Mobile-WiMax; WCDMA; envelope shaping method; multimode envelope tracking power amplifier; software defined radio transmitters; Cognitive radio; Heterojunction bipolar transistors; Hysteresis; Linearity; Multiaccess communication; Power amplifiers; Power generation; Power supplies; Radio transmitters; Software radio; Polar transmitter; envelope-tracking; multi-mode; power amplifiers;
Conference_Titel :
RF Front-ends for Software Defined and Cognitive Radio Solutions (IMWS), 2010 IEEE International Microwave Workshop Series on
Conference_Location :
Aveiro
Print_ISBN :
978-1-4244-5751-9
DOI :
10.1109/IMWS.2010.5441009
