This letter presents a power amplifier (PA) design and network synthesis approach to achieve wideband and efficient performance with a very compact circuit size. A design method is presented in detail to convert a canonical filterbased high-order matching network to the proposed matching configuration with transistor parasitic and packaged elements absorption, and a compact passive network footprint. As a proof of concept, a prototype GaN HEMT PA is implemented. Starting from a fourth-order output network filter, the inductances and capacitance of the filter elements are re-organized to model, and thus absorb the output parasitics of the transistor, leading to a compact footprint with only four transmission lines. The measured results show that the prototype PA achieves an output power of 41.9-44.3 dBm and a 55-74% drain efficiency, over a record-high decade bandwidth (0.35-3.55 GHz).
This research has been carried out in Gigahertz-ChaseOn Bridge Center in a project financed by Chalmers, Ericsson, Gotmic, Infineon, Kongsberg, Saab, and UniqueSec H. Zhou and C. Fager are with the
In concurrent multi-band settings with large carrier spacings between bands, digital pre-distorter (DPD) implementations face the issue of how to linearize a sparse signal spectrum spanned over large bandwidths at low computational complexity. Frequency relocation is one possible approach, which involves relocating baseband carriers to have reduced frequency spacing with the help of band-limiting functions, to yield a denser and smaller signal bandwidth for the DPD to linearize. In this paper, frequency relocation for transmitters with frequency varying gain and phase is explicitly considered. It is shown that bandwise pre-equalization during frequency relocation can reduce the computational complexity for a certain allowed in-band error.
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