O
Oliver Ambacher
Researcher at Fraunhofer Society
Publications - 862
Citations - 29006
Oliver Ambacher is an academic researcher from Fraunhofer Society. The author has contributed to research in topics: Amplifier & Monolithic microwave integrated circuit. The author has an hindex of 64, co-authored 848 publications receiving 26256 citations. Previous affiliations of Oliver Ambacher include Osram & Siemens.
Papers
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Journal ArticleDOI
A 50-nm Gate-Length Metamorphic HEMT Technology Optimized for Cryogenic Ultra-Low-Noise Operation
TL;DR: In this paper, the authors investigated and optimized cryogenic noise mechanisms in InGaAs metamorphic high-electron-mobility transistors (mHEMTs) under room temperature and cryogenic conditions.
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Influence of Different Surface Morphologies on the Performance of High-Voltage, Low-Resistance Diamond Schottky Diodes
Philipp Reinke,Fouad Benkhelifa,Lutz Kirste,Heiko Czap,Lucas Pinti,Verena Zürbig,Volker Cimalla,Christoph E. Nebel,Oliver Ambacher +8 more
TL;DR: In this paper, three diamond Schottky diodes were fabricated on homoepitaxially grown diamond layers with different surface morphologies: smooth as-grown, hillock-rich, and polished.
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Study of inversion domain pyramids formed during the GaN:Mg growth
TL;DR: In this article, the authors present the study of MOCVDgrownGaNs withMgdopingconcentration ranging from 10 to 10 faults per year, which can actastrapsandrecombinationcenters.
Proceedings ArticleDOI
An investigation of millimeter wave switches based on shunt transistors including SPDT SWITCH MMICs up to 300 GHz
TL;DR: In this paper, a design study for millimeter wave single-pole multiple-throw switches, which are based on shunt transistors, is presented, where it is shown that insertion loss and output signal dynamic of a switch are directly correlated to the on-resistance of the utilized semiconductor technology.
Journal ArticleDOI
Realization of a 30-W highly efficient and linear reconfigurable dual-band power amplifier using the continuous mode approach
V. Carrubba,Stephan Maroldt,M. Muser,H. Walcher,Friedbert van Raay,Rudiger Quay,Oliver Ambacher,Dirk Wiegner,Ulrich Seyfried,Thomas Bohn,Andreas Pascht +10 more
TL;DR: In this paper, the authors presented the design methodology and the realization of a highly linear and power-efficient reconfigurable dual-band amplifier based on the continuous/Class-ABJ approach.