DocumentCode :
3608659
Title :
A Highly Efficient LTE Pulse-Modulated Polar Transmitter Using Wideband Power Recycling
Author :
Hao-Shun Yang ; Chun-Wei Chang ; Jau-Horng Chen
Author_Institution :
Dept. of Eng. Sci. & Ocean Eng., Nat. Taiwan Univ., Taipei, Taiwan
Volume :
63
Issue :
12
fYear :
2015
Firstpage :
4437
Lastpage :
4443
Abstract :
This paper presents a wideband power recycling technique for pulse-modulated polar transmitters (PMPTs). The technique allows unwanted out-of-band modulation spurs in PMPTs to be rectified and recovered back to the power supply for efficiency improvement. By configuring the power amplifiers as a balanced amplifier with dual-phase digital pulse-width modulation, the odd modulation spurs can be extracted directly from the isolation port of the output-combining quadrature coupler. Using the proposed architecture, the prototype transmitter achieved 59.1% drain efficiency at an output channel power of 26.2 dBm using a 10-MHz bandwidth long-term evolution 16-quadrature amplitude modulation test signal at 836.5 MHz. After output signal restoration by a surface-acoustic-wave filter, an output power level of 24.8 dBm and 42.8% drain efficiency were achieved while passing the spectral and receive-band-noise requirements without using any digital pre-distortion techniques.
Keywords :
Long Term Evolution; PWM rectifiers; UHF filters; UHF power amplifiers; broadband networks; coupled circuits; differential amplifiers; pulse modulation; quadrature amplitude modulation; radio transmitters; surface acoustic wave filters; 16-quadrature amplitude modulation test signal; LTE pulse-modulated polar transmitter; Long-Term Evolution; PMPT; balanced amplifier; bandwidth 10 MHz; digital pre-distortion technique; dual-phase digital pulse-width modulation; efficiency 42.8 percent; efficiency 59.1 percent; frequency 836.5 MHz; output signal restoration; output-combining quadrature coupler; power amplifier; power supply; receive-band-noise requirement; spectral-band-noise requirement; surface-acoustic-wave filter; unwanted out-of-band modulation; wideband power recycling technique; Couplers; Impedance; Pulse width modulation; Radio frequency; Recycling; Wideband; Long-term evolution (LTE); polar transmitters; power amplifier linearization; power amplifiers (PAs); rectifier;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2015.2484349
Filename :
7302094
Link To Document :
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