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A GaN Voltage-Mode Class-D MMIC with Improved Overall Efficiency for Future RRH Applications
/forschung/publikationen/a-gan-voltage-mode-class-d-mmic-with-improved-overall-efficiency-for-future-rrh-applications
This paper reports on a compact voltage-mode class-D power amplifier module suitable for the LTE frequency band of 800 MHz. It includes a 3-stage GaN MMIC and a hybrid lumped-element output filter…
GaN-HEMTs as Switches for High-Power Wideband Supply Modulators
/forschung/publikationen/gan-hemts-as-switches-for-high-power-wideband-supply-modulators
A highly efficient GaN-HEMT based supply modulator suitable for envelope tracking (ET) systems is designed and analyzed. Varying the transistor size in the power switching stage reveals the critical…
Bandwidth versus Efficiency Performance using Power Combining in GaN HEMT Power Amplifiers
/forschung/publikationen/bandwidth-versus-efficiency-performance-using-power-combining-in-gan-hemt-power-amplifiers
Transistors manufacturers are increasing the output power of their devices presently by enlarging the gate width of the transistors. This work discusses the tradeoff between the increased parasitic…
Compact High-Power GaN Oscillator with 2.45 GHz Differential Output
/forschung/publikationen/compact-high-power-gan-oscillator-with-245-ghz-differential-output
This paper describes a very small 2.45 GHz high power oscillator with differential outputs. A pair of GaN HEMTs delivers 42 W of output power at 39 % efficiency. Easy load matching is…
Thick-Film Barium-Strontium-Titantate Varactors for RF Power Transistors
/forschung/publikationen/thick-film-barium-strontium-titantate-varactors-for-rf-power-transistors
This work addresses the properties of Barium- Strontium-Titanate based thick-film varactors at conditions that are expected to arise when the varactors are integrated in a packaged RF power…
Load-Modulated GaN Power Amplifier Implementing Tunable Thick Film BST Components
/forschung/publikationen/load-modulated-gan-power-amplifier-implementing-tunable-thick-film-bst-components
In this work, a novel adaptive broadband power amplifier (PA) design based on barium-strontium-titanate (BST) components for dynamic load modulation (DLM) is presented. The designed PA, driven in…
180 GHz Frequency Doubler in Transferred-Substrate InP HBT Technology with 4 dBm Output Power
/forschung/publikationen/180-ghz-frequency-doubler-in-transferred-substrate-inp-hbt-technology-with-4-dbm-output-power
A single-ended frequency doubler in transferredsubstrate (TS) InP-DHBT technology is presented with state-ofthe- art results. A maximum output power of 4 dBm and 9.6 dB conversion loss at…
Tapered Diode Pumped Continuous Wave Alexandrite Laser
/forschung/publikationen/tapered-diode-pumped-continuous-wave-alexandrite-laser
We describe a low-cost and efficient Alexandrite (Cr:BeAl2O4) laser that is pumped by a high-brightness tapered diode laser. The tapered diode provides up to 1.1 W of output power and its…
Advances in High Power Semiconductor Lasers
/forschung/publikationen/advances-in-high-power-semiconductor-lasers
We review high power semiconductor laser development at the Ferdinand-Braun-Institut, focusing on studies to improve material quality, design development for peak performance in standard structures…
Progress in efficiency-optimized high-power diode lasers
/forschung/publikationen/progress-in-efficiency-optimized-high-power-diode-lasers
High-power diode lasers are highly efficient sources of optical energy for industrial and defense applications, either directly or as pump sources for solid state or fiber lasers. We review here how…