Load Resilient Double Balanced Sequential Power Amplifier for MIMO Transceivers

Loose M, Deublein A, Musolff C, Franchi N, Fischer G (2026)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2026

Publisher: IEEE

Pages Range: 49 - 52

Event location: Hollywood, CA, USA US

ISBN: 979-8-3315-6160-4

URI: https://ieeexplore.ieee.org/document/11408514

DOI: 10.1109/PAWR69496.2026.11408514

Abstract

This work presents a power amplifier (PA) demonstrator targeting circulatorless base stations to facilitate dense MIMO integration. Implemented using a novel RF GaN-on-Si technology developed by Infineon, the demonstrator addresses the inherent mismatch resilience required in such frontends, which conventional Doherty power amplifier (DPA) or load modulated balanced amplifier (LMBA) lack due to their mismatch phase sensitivity. The double balanced sequential amplifier (DBSA), also referred to as PD-LMDBA, was selected for its superior mismatch resilience. A design technique is presented, which makes use of non-mutual load modulation, which enables a sequential design flow: First the main branch is optimized independently, subsequently used for nonlinear analysis of the auxiliary branch under unidirectional load modulation. A hardware demonstrator covering the 5G NR n104 band (6.425 to 7.125 GHz) was implemented using a novel RF GaN-on-Si technology developed by Infineon and verified via pulsed CW measurements. At 6.8 GHz, 68.7% drain efficiency and 42dBm output power were achieved at P2dB. The average efficiency under a clipped OFDM waveform with 8 dB PAPR is estimated to 42%.

Authors with CRIS profile

Michael Loose Lehrstuhl für Intelligente Technische Elektronik und Systeme Alexander Deublein Lehrstuhl für Intelligente Technische Elektronik und Systeme Christian Musolff Lehrstuhl für Technische Elektronik (LTE) Norman Franchi Lehrstuhl für Technische Elektronik (LTE) Georg Fischer Professur für Technische Elektronik

How to cite

APA:

Loose, M., Deublein, A., Musolff, C., Franchi, N., & Fischer, G. (2026). Load Resilient Double Balanced Sequential Power Amplifier for MIMO Transceivers. In Proceedings of the 2026 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR) (pp. 49 - 52). Hollywood, CA, USA, US: IEEE.

MLA:

Loose, Michael, et al. "Load Resilient Double Balanced Sequential Power Amplifier for MIMO Transceivers." Proceedings of the 2026 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), Hollywood, CA, USA IEEE, 2026. 49 - 52.

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