Title :
Load modulation power amplifier with lumped-element combiner for IEEE 802.11b/g WLAN applications
Author :
Nam, J. ; Shin, J. ; Kim, B.
Author_Institution :
Dept. of Electr. Eng., Postech, Gyungbuk, South Korea
Abstract :
A new monolithic microwave integrated circuit power amplifier for 802.11b/g wireless local area network (WLAN) has been implemented using the load modulation concept of a Doherty amplifier. The λ/4 transmission line for the load modulation circuit of the carrier amplifier is replaced by a lumped element based π-network, which dual functions as an output matching network, simultaneously. This amplifier shows that error vector magnitude is about 4.6% and power added efficiency (PAE) about 31.8% at Pout of 19 dBm for a 802.11g 64QAM signal. PAE of the power amplifier is about 49.6%, and adjacent channel leakage ratio below 37.2dBc at 11 MHz offset at Pout of 23 dBm for the 802.11b complementary code keying signal
Keywords :
MMIC power amplifiers <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; bipolar MMIC <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; impedance matching <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; lumped parameter networks <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; quadrature amplitude modulation <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; wireless LAN <load modulation power amp., lumped-element combiner for IEEE 802.11b/g WLAN appls.>; 2.4 GHz; 64 QAM signal; Doherty amplifier; IEEE 802.11b/g WLAN applications; MMIC chip; adjacent channel leakage ratio; complementary code keying signal; error vector magnitude; load modulation concept; lumped element based π-network; lumped-element combiner; monolithic microwave integrated circuit; output matching network; power added efficiency; power amplifier; wireless local area network;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20063591
