Title :
Practical high-efficiency partial-Envelope Tracking power amplifier system with broadband applications
Author :
Sorsby, William B. ; Kean, Timothy L. ; Heibel, Scott L. ; Hegazi, Gamal M.
Author_Institution :
Rockwell Collins, Inc., Cedar Rapids, IA, USA
Abstract :
Spectrally-efficient high peak-to-average power ratio (PAPR) waveforms exhibit disadvantages compared to constant-envelope waveforms for frequency-agile systems when power-efficiency is paramount. EER and Envelope Tracking offer high efficiency but require precise adjustment and wide bandwidth power supplies/modulators. Frequency agility introduces implementation complexities when systems must tune wide frequency ranges or cover multiple channels. Combining advantages of Envelope Tracking and EER, a partial-envelope tracking power amplifier system demonstrates robust operation across multiple channels, requires no frequency dependent adjustments, and exhibits excellent spectral purity combined with high power-efficiency. Experimental UHF data shows 135 watts of output power with 55% efficiency using LDMOS devices, for uplink WCDMA (approximately 4dB PAPR).
Keywords :
UHF power amplifiers; VHF amplifiers; code division multiple access; wavelength division multiplexing; EER; LDMOS devices; broadband applications; frequency-agile systems; high-efficiency partial-envelope tracking power amplifier system; peak-to-average power ratio waveforms; power 135 W; uplink WCDMA; Bandwidth; Broadband amplifiers; Frequency dependence; High power amplifiers; Operational amplifiers; Peak to average power ratio; Power amplifiers; Power generation; Power supplies; Robustness; EER; Envelope Elimination and Restoration; Envelope Tracking; OFDM; Polar Modulation; WCDMA; high-efficiency; power amplifiers; pre-distortion;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2010 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-4725-1
Electronic_ISBN :
978-1-4244-4726-8
DOI :
10.1109/RWS.2010.5434183
