Abstract
This article presents a highly efficient Doherty power amplifier (DPA) with 4.4% relative signal bandwidth for long-term evolution (LTE) application at frequency band of 450–470 MHz.To maintain high efficiency at large back-off power (BOP), the DPA is unsymmetrical and the carrier and peaking amplifiers are implemented to show unequal saturation power. Experimental results using continuous wave signal indicate a power-added efficiency (PAE) of 64.3% at saturation power of 49.9 dBm and a PAE of 62% at about 6-dB BOP. For 20 MHz LTE signal, the adjacent channel leakage ratio is −30 dBc and can be improved to −49 dBc by using the digital predistortion technique at an average output power of 41.5 dBm with a PAE of 51%. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2352–2356, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27043
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