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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 presents the methods to improve load modulation in Doherty along with two modified GaN Doherty power amplifiers (PAs) with high efficiency and linearity at large back-off power for 100 MHz LTE-advanced application. To improve load modulation, the peaking amplifier is designed to achieve similar output current with that of the carrier amplifier by choosing optimal load impedances in class...
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