Unbalanced Power Amplifier: An Architecture for Broadband Back-Off Efficiency Enhancement
نویسندگان
چکیده
In this article, we present a new broadband power amplifier (PA) architecture with back-off efficiency enhancement that supports very wide modulation bandwidths. The unbalanced PA is composed of two cooperating sub-PAs using the Lange couplers as input splitter and output combiner. operation controlled by transistors' width ratio coupling coefficients couplers. (OPBO) level given coefficient coupler, while maximum achieved at point. These features provide more design flexibility compared conventional Doherty PA, where OPBO can be set only ratio, peak power. Using harmonic matching networks, main auxiliary operate in continuous mode to improve over broad bandwidth. A fully integrated implemented 250-nm GaN-on-SiC process, achieves 32.2-34.3-dBm power, 27%-37% 27%-40% 5-6-dB back-off, across 4.5-6.5 GHz. provides 3.7/4.5% (-28.6/-26.9 dB) rms error vector magnitude (EVMrms) 30% average for 256-QAM signal 100-/200-MHz bandwidth, 7.2-dB PAPR, 25.5-dBm without any predistortion.
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ژورنال
عنوان ژورنال: IEEE Journal of Solid-state Circuits
سال: 2021
ISSN: ['0018-9200', '1558-173X']
DOI: https://doi.org/10.1109/jssc.2020.3014244