Title :
A Spur-Reduced Multimode Power-Level Tracking Power Amplifier Using a Frequency-Hopping DC–DC Converter
Author :
Chen, Jau-Horng ; Liu, Pang-Jung ; Hung, Yu-Ling ; Yang, Hao-Shun ; Chen, Yi-Jan Emery
Author_Institution :
Dept. of Eng. Sci. & Ocean Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
5/1/2010 12:00:00 AM
Abstract :
This paper presents a power-level tracking power amplifier with reduced spurious emission by utilizing a dc-dc converter with frequency-hopping capability. Measurements were performed for a wideband code-division multiple access (W-CDMA) signal and an EDGE signal at 836.5 MHz. The results show a two times improvement in average efficiency while showing negligible spectral degradation for the W-CDMA standard. For the EDGE standard, the efficiency was also improved by a factor of 2 for medium power levels compared to not using a dc-dc converter. Moreover, the spurious emissions were improved by up to 4.5 dB using the proposed technique.
Keywords :
3G mobile communication; DC-DC power convertors; cellular radio; code division multiple access; power amplifiers; switching convertors; telecommunication standards; EDGE standard; W-CDMA standard; frequency 836.5 MHz; frequency-hopping DC-DC converter; negligible spectral degradation; spur-reduced multimode power-level tracking power amplifier; spurious emission; wideband code-division multiple access signal; DC–DC power conversion; microwave amplifiers; power amplifiers (PAs); radio transmitters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2010.2042858
