| Autor: |
Catarina Belchior, Luis C. Nunes, Pedro M. Cabral, Jose C. Pedro |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
IEEE Access, Vol 11, Pp 69916-69927 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2169-3536 |
| DOI: |
10.1109/ACCESS.2023.3293425 |
| Popis: |
This article proposes an automatic methodology for the design of a sequential load-modulated balanced amplifier (SLMBA), which takes corrections for its output combiner’s (a 90° hybrid) frequency response. The method uses a properly selected control amplifier phase to compensate for the 90° hybrid frequency response and finds the accurate impedances that are observed towards the hybrid. Based on this, and on a multi-dimensional search performed over the control and balanced devices’ load-pull data, the optimum termination impedance profiles are found, considering the desired output power levels and efficiency. The balanced power amplifiers off-state impedance is also incorporated in the methodology to prevent the otherwise unavoidable SLMBA performance degradation. Consequently, three scattering parameter matrices are obtained in a polynomial form, corresponding to the output matching networks of the balanced and control amplifiers, and the required post-matching network at the $50~\Omega $ output port. Finally, the method is validated with a practical SLMBA implementation, synthesizing real matching networks that realize the derived S-parameter matrices. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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