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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Chen et al. (2010) studied this question.
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