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Circuit d'amplification Doherty intégré large bande pour applications radio cellulaires de puissance

Hao Zhang 1 
Abstract : This work presents the design, realization and measurement result of integrated broadband Doherty amplification circuits for base stations, required for 5G. Initially, based on the research for techniques to improve electrical efficiency for signals with high dynamic range, the Doherty technique is chosen to continue the work. Studies on different Doherty architectures showed that performance can be improved and extended by adding a third stage (3-way Doherty) with calculated auxiliary transistors’ sizes for which are operated in class C mode. Limitations on the practical use of the Doherty technique is demonstrated by the considerations of various non linearities of the LDMOS transistors. The research of wideband architectures shows simultaneous advantages of integration and broadband capability by the CdS absorption technique and the use of mixed type of input splitters. Based on the results of various studies, three-way Doherty MMIC power amplifiers were designed and realized using the CdS absorption technique with an asymmetry ratio of 1 : 3 : 3 in the band of 1805 MHz to 2170 MHz. Experimental performances have shown the potentialities of the 3-way Doherty and a clear efficiency improvement over the entire frequency band. Specific wideband operating conditions are presented to reduce distortion products of third (IMD 3), 10th and 12th (IMD 10/12). The linearity measurements at different instantaneous bandwidths are very encouraging and validate the new asymmetric three-way Doherty architecture.
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Submitted on : Wednesday, September 7, 2022 - 11:33:15 AM
Last modification on : Thursday, September 8, 2022 - 4:03:06 AM


Version validated by the jury (STAR)


  • HAL Id : tel-03771298, version 1



Hao Zhang. Circuit d'amplification Doherty intégré large bande pour applications radio cellulaires de puissance. Micro et nanotechnologies/Microélectronique. Université de Poitiers, 2019. Français. ⟨NNT : 2019POIT2265⟩. ⟨tel-03771298⟩



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