Title :
A 31.5dBm outphasing class-D power amplifier in 45nm CMOS with back-off efficiency enhancement by dynamic power control
Author :
Tai, Wei ; Xu, Hongtao ; Ravi, Ashoke ; Lakdawala, Hasnain ; Degani, Ofir B. ; Carley, L. Richard ; Palaskas, Yorgos
Author_Institution :
Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
A transformer-combined fully Integrated outphasing class-D PA In 45nm CMOS achieves 31.5dBm peak output power at 2.4GHz with 27% efficiency, and supports over 86dB of output power range. The PA employs Dynamic Power Control (DPC) whereby sections of the PA are turned on-off dynamically according to the OFDM amplitude to reduce power dissipation at backoff. The PA delivers 24.8dBm average power while meeting 64-QAM WLAN requirements. PAE is 16% when using DPC, which represents a 33% efficiency enhancement compared to the DPC-disabled mode. At lower average power of 20.5dBm, DPC enables a 140% enhancement in average efficiency, hence battery life.
Keywords :
CMOS analogue integrated circuits; OFDM modulation; UHF power amplifiers; nanoelectronics; wireless LAN; 64-QAM WLAN requirements; CMOS; OFDM amplitude; back-off efficiency enhancement; battery life; dynamic power control; frequency 2.4 GHz; outphasing class-D power amplifier; power dissipation; size 45 nm; transformer-combined fully Integrated outphasing class-D PA; CMOS integrated circuits; Coils; IEEE 802.11 Standards; OFDM; Power control; Power generation; WiMAX;
Conference_Titel :
ESSCIRC (ESSCIRC), 2011 Proceedings of the
Conference_Location :
Helsinki
Print_ISBN :
978-1-4577-0703-2
Electronic_ISBN :
1930-8833
DOI :
10.1109/ESSCIRC.2011.6044882
