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Reliability issues of GaN based high voltage power devices
/forschung/publikationen/reliability-issues-of-gan-based-high-voltage-power-devices
GaN based power devices for high efficiency switching applications in modern power electronics are rapidly moving into the focus of world wide research and development activities. Due to their unique…
Widely Tunable High-Power Tapered Diode Laser at 1060 nm
/forschung/publikationen/widely-tunable-high-power-tapered-diode-laser-at-1060nbspnm
We report a large tuning range from 1018 to 1093 nm from a InGaAs single quantum-well 1060-nm external cavity tapered diode laser. More than 2.5-W output power has been achieved. The tuning…
Thermal optimization of second harmonic generation at high pump powers
/forschung/publikationen/thermal-optimization-of-second-harmonic-generation-at-high-pump-powers
We measure the temperature distribution of a 3 cm long periodically poled LiNbO3 crystal in a single-pass second harmonic generation (SHG) setup at 488 nm. By means of three resistance…
Diode-pumped mode-locked Yb:YCOB laser generating 35 fs pulses
/forschung/publikationen/diode-pumped-mode-locked-ybycob-laser-generating-35nbspfs-pulses
Direct sub-50-fs pulse generation is demonstrated with a mode-locked Yb:YCa4O(BO3)3 laser. With external compression, pulses as short as 35 fs are generated at 1055nm. The oscillator operating…
Miniaturized Tunable External Cavity Diode Laser with Single-Mode Operation and a Narrow Linewidth at 633 nm
/forschung/publikationen/miniaturized-tunable-external-cavity-diode-laser-with-single-mode-operation-and-a-narrow-linewidth-at-633nbspnm
A miniaturized, standalone tunable semiconductor laser module operating at a wavelength of 633 nm with a footprint as small as 10 mm x 5 mm is presented. The module is based…
Optimized Coding Scheme for Class-S Amplifiers
/forschung/publikationen/optimized-coding-scheme-for-class-s-amplifiers
This paper is based on a voltage-mode class-S power amplifier for the 450 MHz band using GaN-MMICs. To optimize back-off performance, the conventional topology is modified and the circuit is…
Radiation, Multimode Propagation, and Substrate Modes in W-Band CPW Calibrations
/forschung/publikationen/radiation-multimode-propagation-and-substrate-modes-in-w-band-cpw-calibrations
We investigate the degradation of the accuracy of coplanar waveguide calibration standards at higher frequencies due to multi-mode propagation, substrate modes, and radiation. Based on a typical…
Shifted linear systems in electromagnetics. Part II: Systems with multiple right-hand sides
/forschung/publikationen/shifted-linear-systems-in-electromagnetics-part-ii-systems-with-multiple-right-hand-sides
We consider the solution of multiply shifted linear systems for multiple right-hand sides. The coefficient matrix is symmetric, complex, and indefinite. The matrix is shifted by different multiples…
Calibration residual error propagation analysis using conformal mapping
/forschung/publikationen/calibration-residual-error-propagation-analysis-using-conformal-mapping
In this paper a new method is introduced for analyzing the error propagation when calibrating a vector network analyzer (VNA) with non-ideal calibration elements ("standards"). The…
60 GHz Power Amplifier Utilizing 90 nm CMOS Technology
/forschung/publikationen/60-ghz-power-amplifier-utilizing-90-nm-cmos-technology
This paper presents a fully integrated 60 GHz two stage power amplifier for wireless applications using common source topology and power combining. The PA is implemented in a 90 nm low…