Drain Voltage Impact on a Doherty Power Amplifier's Optimal Splitting Parameters

Illmer A, Deublein A, Loose M, Musolff C, Weigel R, Fischer G (2025)

Publication Language: English

Publication Type: Conference contribution, Conference Contribution

Publication year: 2025

Publisher: IEEE

Pages Range: 106-108

Event location: Bali

ISBN: 979-8-3503-6354-8

URI: https://ieeexplore.ieee.org/document/10867729

DOI: 10.1109/apmc60911.2024.10867729

Abstract

Switching the Drain voltage Vdd of a power amplifier (PA) in a quasi-static manner is an effective way of achieving efficient operation at a reduced aver-age output power. This work investigates the impact of Vdd on the optimal drive function parameters of a GaN-on-Si dual-input Doherty power amplifier (di-DPA). Measurement sweeps were conducted on the frequency, power ratio, relative phase, and Gate bias setting of the Auxiliary PA for two distinct values of Vdd. A predis-torted 20-MHz signal is applied and adjusted to a fixed average output power. A quasi-static drive function is used, meaning the parameters are not dynamically modulated over power. The goal is to find an optimum set of drive parameters for each Vdd. It is demonstrated that the optimum set of drive parameters does not vary significantly over the frequency. Switching Vdd results in a shift of the operating state of the di-DPA away from the efficiency maximum, which can be compensated for by adjustina the relative drive phase.

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How to cite

APA:

Illmer, A., Deublein, A., Loose, M., Musolff, C., Weigel, R., & Fischer, G. (2025). Drain Voltage Impact on a Doherty Power Amplifier's Optimal Splitting Parameters. In Proceedings of the 2024 IEEE Asia-Pacific Microwave Conference (APMC) (pp. 106-108). Bali, ID: IEEE.

MLA:

Illmer, Andreas, et al. "Drain Voltage Impact on a Doherty Power Amplifier's Optimal Splitting Parameters." Proceedings of the 2024 IEEE Asia-Pacific Microwave Conference (APMC), Bali IEEE, 2025. 106-108.

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