TR2022-012

A Hybrid Heuristic Search Control Assisted Optimization of Dual-Input Doherty Power Amplifier


    •  Kantana, C., Ma, R., Benosman, M., Komatsuzaki, Y., Yamanaka, K., "A Hybrid Heuristic Search Control Assisted Optimization of Dual-Input Doherty Power Amplifier", European Microwave Conference 2021, February 2022.
      BibTeX TR2022-012 PDF
      • @inproceedings{Kantana2022feb,
      • author = {Kantana, Chouaib and Ma, Rui and Benosman, Mouhacine and Komatsuzaki, Yuji and Yamanaka, Koji},
      • title = {A Hybrid Heuristic Search Control Assisted Optimization of Dual-Input Doherty Power Amplifier},
      • booktitle = {European Microwave Conference 2021},
      • year = 2022,
      • month = feb,
      • url = {https://www.merl.com/publications/TR2022-012}
      • }
  • MERL Contacts:
  • Research Areas:

    Communications, Electronic and Photonic Devices, Optimization

Abstract:

This paper proposes an auto-tuning approach to find the optimal configuration of a dual-input Doherty poweramplifier (DIDPA) to enhance power efficiency while maintaininga good linearity level. The DIDPA configuration consists of a setof circuits and system-level parameters called free-parametersthat are optimized through a hybrid heuristic search control(HHSC), which is the core of the auto-tuning approach. TheHHSC convergence towards the optimal solution is conducted bya cost function designed to present a trade-off between efficiencyand linearity. The HHSC was validated through experimentalusing a 20 MHz LTE signal at 3 GHz, where DIDPA exhibited adrain efficiency (DE) of 60% at an output power level of 36 dBm. The linearizability of DIDPA has been validated through digitalpredistortion (DPD), where the error vector magnitude (EVM) isreduced to 2.5%, and the adjacent channel power ratio (ACPR)is improved to -48 dBc.