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This paper presents a digitally-controlled highly efficient supply modulator. This supply modulator is implemented as a multilevel converter in series with a linear amplifier. The multilevel converter output which controlled by digital signals is employed to supply the linear amplifier. The digitally controlled strategy and the optimization of the supply levels can make the converter output to approach...
This paper proposes a new form of polynomial model for concurrent dual-band digital predistortion. Different with usual 2D-DPD models, the new model introduces (x1(n-m) + x2(n-m))and (x1(n-m) - x2(n-m))two terms, avoids (x1(n-m) + x2(n-m)j term to make the polynomial form simplified. A High efficiency Broadband GaN HEMT power amplifier is used to verify the model. The dual 20MHz band spacing 140MHz...
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