A Wideband Doherty Architecture With 36% of Fractional Bandwidth

作者：Piazzon Luca^*; Giofre Rocco; Colantonio Paolo; Giannini Franco

来源：IEEE Microwave and Wireless Components Letters, 2013, 23(11): 626-628.

DOI：10.1109/LMWC.2013.2281413

• Broadband
• Doherty amplifier
• GaN
• high efficiency
• wideband

This letter presents the design and characterization of a novel wideband Doherty architecture. Both input splitter and output combiner are realized by means of two-sections branch-line alike couplers. The realized prototype based on commercial GaN active devices shows more than 36% of fractional bandwidth, from 1.67 to 2.41 GHz. In this frequency range, the measured drain efficiency is within 59% and 43% at 6 dB of output power back-off and within 72% and 53% at saturation, with an output power around 41 dBm. More than 47% average efficiency and less than -40 dBc adjacent channel power ratio are measured applying a 20 MHz LTE digitally pre-distorted signal when the average output power is around 4 W.

• 出版日期2013-11