Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Limitations and Implementation Strategies of Interstage Matching in a 6-W, 28-38-GHz GaN Power Amplifier MMIC

: Neininger, Philipp; John, Laurenz; Thome, Fabian; Friesicke, Christian; Brueckner, Peter; Quay, Rüdiger; Zwick, Thomas

Volltext ()

IEEE transactions on microwave theory and techniques 69 (2021), Nr.5, S.2541-2553
ISSN: 0018-9480
ISSN: 1557-9670
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IAF ()
gallium nitride (GaN); high-electron-mobility transistor (HEMT); Ka-Band; milimeter-wave (mmW); monolithic microwave integrated circuit (MMIC); power amplifier (PA); space mapping; wideband matching

In this article, we summarize the theoretical matching boundaries and show the limitations they implicate for real-world amplifier design. Starting with a common schematic prototype, we investigate the question of how to realize its electrical response in a densely routed, massively parallelized layout. To that end, we develop a comprehensive study on the application of space-mapping techniques toward the design of high-power amplifiers (HPAs). We derive three reference design procedures and compare their performance in terms of convergence, speed, and practicality when laying out a densely routed HPA interstage matching network. Subsequently, we demonstrate the usefulness of the study by designing the networks of a compact three-stage eight-way wideband HPA in the Ka-band. The processed monolithic microwave integrated circuit features a 1-dB large-signal bandwidth of more than 11 GHz (a fractional bandwidth of 32.8%) and thus covers most of the Ka-band with an output power exceeding 6 W in 3 dB of gain compression. This demonstrates the highest combination of power and bandwidth to date using a reactively matched topology in the Ka-band.