Title :
Wideband envelope elimination and restoration power amplifier with high efficiency wideband envelope amplifier for WLAN 802.11g applications
Author :
Wang, Feipeng ; Kimball, Donald ; Popp, Jeremy ; Yang, Annie ; Lie, Donald Y C ; Asbeck, Peter ; Larson, Lawrence
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., La Jolla, CA, USA
Abstract :
This paper presents the design of a silicon bipolar Class-E wideband envelope elimination and restoration (WBEER) power amplifier with a wideband high efficiency envelope amplifier. The envelope amplifier is composed of a linear op-amp stage and a switch buck converter, which achieves high fidelity and high efficiency amplification of wideband high peak to average (PAR) envelope signals. Experimental results show that the envelope amplifier has a bandwidth of 20MHz and 50-60% efficiency. An overall EER power added efficiency (PAE) of 28% at an output power of 19 dBm was achieved for a WEAN OFDM signal at 2.4 GHz.
Keywords :
OFDM modulation; wideband amplifiers; wireless LAN; 0.80211 kg; 2.4 GHz; 20 MHz; 28 percent; 50 to 60 percent; Class B amplifier; Class E amplifier; EER power added efficiency; WEAN OFDM signal; WLAN applications; dc-dc converter; envelope tracking; high efficiency wideband envelope amplifier; hysteretic control; linear op-amp stage; power amplifiers; restoration power amplifier; switch buck converter; wideband envelope elimination; wideband high peak average envelope signals; Bandwidth; Broadband amplifiers; Buck converters; High power amplifiers; Operational amplifiers; Peak to average power ratio; Signal restoration; Silicon; Switches; Wireless LAN;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1516688
