power amplifiers
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Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 84
Author(s):  
Anna Piacibello ◽  
Vittorio Camarchia

This paper discusses some of the design choices underlying the development of watt-level integrated Doherty power amplifiers in the K and Ka band, focusing on compound semiconductor technologies. The key aspect of on-chip power combination is discussed, presenting and comparing some of the possible alternatives. Then, the impact on the achievable bandwidth and performance of different parameters is quantified, adopting an approximate analysis, which focuses on the Doherty output combiner and allows estimating the non-linear performance of the amplifier thanks to some simplifying assumptions, without requiring a full, non-linear model of the active devices. Two sample GaAs and GaN technologies are compared first, considering parameters that are representative of the currently available commercial processes, and then several power combination strategies are analyzed, adopting the GaN technology, which is currently the only one that allows achieving the power levels required by the applications directly on chip. Finally, some hints as to the impact of the output parasitic effects of the transistors on the presented analysis are given.


Author(s):  
Hanlin Xie ◽  
Zhihong Liu ◽  
Wenrui Hu ◽  
Yu Gao ◽  
Hui Teng Tan ◽  
...  

Abstract AlN/GaN metal-insulator-semiconductor high electron mobility transistors (MISHEMTs) on silicon substrate using in-situ SiN as gate dielectric were fabricated and their RF power performance at mobile system-on-chip (SoC) compatible voltages was measured. At a mobile SoC-compatible supply voltage of Vd = 3.5 V/5 V, the 90-nm gate-length AlN/GaN MISHEMTs showed a maximum power-added efficiency (PAE) of 62%/58%, a maximum output power density (Poutmax) of 0.44 W/mm/0.84 W/mm and a linear gain of 20 dB/19 dB at the frequency of 5 GHz. These results suggest that the in-situ-SiN/AlN/GaN-on-Si MISHEMTs are promising for RF power amplifiers in 5G mobile SoC applications.


Author(s):  
Mohammad Behdad Jamshidi ◽  
Saeed Roshani ◽  
Jakub Talla ◽  
Maryam S. Sharifi-Atashgah ◽  
Sobhan Roshani ◽  
...  

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