Abstract
The design and implementation of an asymmetrical Doherty power amplifier are discussed, where two Cree GaN High Electron Mobility Transistors (HEMTs) devices are used for designing an asymmetrical Doherty power amplifier to achieve saturated power of 48 dBm and optimal back-off efficiency of 8 dB in the frequency band of 3.3–3.5 GHz. Rogers RO4350B material is used as a substrate material, a back-off of 8 dB was achieved with an average gain of 10 dB. Load-pull data are an important tool for determining the optimum load impedance that the transistor needs to see. Additionally, the measured efficiency was 50% when the designed amplifier was tested by a modulated signal of 8 dB peak-to-average-power ratio when the average output power was 40 dBm. At the same time, the linearity of the designed amplifier was measured and found 31.8 dB which can be improved using a digital pre-distorter. The gain phase measurement can be used as an indicator for compensating the phase difference between the two cells.
Highlights
Current and future mobile communications need to deal with high data and video traffic which needs to be transmitted within a limited bandwidth, mainly because the user is more attracted by the social media contents, online gaming, and video streaming, as well as the Internet of Things (IoTs) technology revolution
MIMO, and more complex modulation schemes, where the modulated signal will have a high signal envelope that increases the peak to average power ratio (PAPR)
Modern power amplifiers should be designed to deal with high input PAPR, so that, it should work with a large output power back-off (OBO) with high efficiency
Summary
Current and future mobile communications need to deal with high data and video traffic which needs to be transmitted within a limited bandwidth, mainly because the user is more attracted by the social media contents, online gaming, and video streaming, as well as the Internet of Things (IoTs) technology revolution. Modern power amplifiers should be designed to deal with high input PAPR, so that, it should work with a large output power back-off (OBO) with high efficiency. 22 of of 13 technique of obtaining good efficiency and linearity concurrently is the Doherty amplifier, where obtaining good efficiency and linearity concurrently is the Doherty amplifier, where neither signal neither signal processing blocks nor additional controlling circuits are needed [2,3,4,5,6,7,8].
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