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A Spur-Reduced Multimode Power-Level Tracking Power Amplifier Using a Frequency-Hopping DC–DC Converter

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5 Author(s)
Jau-Horng Chen ; Dept. of Eng. Sci. & Ocean Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Pang-Jung Liu ; Yu-Ling Hung ; Hao-Shun Yang
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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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:58 ,  Issue: 5 )