Title :
Linearity improvement and efficiency boosting for parallel power amplifiers
Author :
Kim, Sung Yong ; Jang, Mi Ae ; Kim, Young ; Kim, Ell Kou
Author_Institution :
Sch. of Electron. Eng., Kumoh Nat. Inst. of Technol., Gumi, South Korea
Abstract :
In this paper, a study of linearity improvement and efficiency boosting for parallel power amplifiers is presented. The proposed circuit makes inverse characteristic of upper path power amplifier third order intermodulation distortion (IMD3) signals using lower path power amplifier. So, main carrier power level become double and IMD3 signals are cancelled. The test results show that IMD3 signals of PA are suppressed more than 20dB for CW two-tone signals. Also, overall efficiency is improved 4% to 8% for two-tone signals. When the input signal CDMA 1FA is applied, the measured ACPR is improved 7.54dB at 885kHz offset frequency. Also, overall efficiency is improved 1.6% for CDMA 1FA signals.
Keywords :
code division multiple access; interference suppression; intermodulation distortion; power amplifiers; 885 kHz; ACPR; CDMA 1FA signals; CW two-tone signals; IMD3 signals; efficiency boosting; linearity improvement; lower path power amplifier; parallel power amplifiers; third order intermodulation distortion signals; upper path power amplifier; Attenuators; Boosting; Circuit testing; Intermodulation distortion; Linearity; Multiaccess communication; Phase shifters; Power amplifiers; Power generation; Radiofrequency amplifiers; ACPR; efficiency; intermodulation distortion; linearity; parallel power amplifiers;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606484
