Title :
A digitally controlled PA with tunable matching network
Author :
Fei Jia ; Dong Huang ; Shengxi Diao ; Zhongqian Fu ; Fujiang Lin
Author_Institution :
Dept. of EE, Univ. of Sci. & Technol. of China (USTC), Hefei, China
Abstract :
A class AB power amplifier (PA) with output power digital controllability for WSNs is implemented in 65nm CMOS technology. The programmable output power is realized by altering the number of working cells and adjusting the load through a tunable matching network, which can increase the back-off efficiency significantly. Dummy FETs are used for neutralization to increase reverse isolation. The measurement results show a peak output power of 3dBm and a PAE of 40% with a 1.2V supply. Drain efficiency at back off (above 3dB) increases by more than 10%, comparing to traditional digital controlled PA.
Keywords :
CMOS analogue integrated circuits; digital control; power amplifiers; wireless sensor networks; CMOS technology; WSN; class AB power amplifier; digitally controlled PA; dummy FET; efficiency 40 percent; size 65 nm; tunable matching network; voltage 1.2 V; Arrays; Capacitors; Dynamic range; FETs; Inductors; Power generation; Digital control; neutralization; power amplifier; tunable matching network; wireless sensor networks;
Conference_Titel :
Radio-Frequency Integration Technology (RFIT), 2012 IEEE International Symposium on
Conference_Location :
Singapore
Print_ISBN :
978-1-4673-2303-1
DOI :
10.1109/RFIT.2012.6401674
