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Picosecond Pulse Generation and Pulse Train Stability of A Monolithic Passively Mode-Locked Semiconductor Quantum-Well Laser at 1070 nm
/forschung/publikationen/picosecond-pulse-generation-and-pulse-train-stability-of-a-monolithic-passively-mode-locked-semiconductor-quantum-well-laser-at-1070-nm
We experimentally study the pulse generation and the pulse train timing and amplitude stability of a monolithic passively mode-locked multisection quantum-well semiconductor laser. The laser emits a…
Superconductive coupling in tailored [(SnSe)1+δ]m(NbSe2)1 multilayers
/forschung/publikationen/superconductive-coupling-in-tailored-snse1-deltamnbse21-multilayers
Ferecrystals are a new artificially layered material system, in which the individual layers are stacked with monolayer precision and are turbostratically disordered. Here, the superconducting…
GaN-based digital transmitter architectures for 5G
/forschung/publikationen/gan-based-digital-transmitter-architectures-for-5g
Fully digital transmitter chains are an important step towards the software-defined radio. Digital amplification is obtained by encoding the baseband signal into a binary bit stream and amplifying…
Novel approach for E/D transistors integration in GaN HEMT technology
/forschung/publikationen/novel-approach-for-ed-transistors-integration-in-gan-hemt-technology
The purpose of this work is to introduce a novel concept for integrating enhancement mode (E-mode) and depletion mode (D-mode) AlGaN/GaN HEMTs in the same fabrication process. Unlike existing E/D…
Effects Degrading Accuracy of CPW mTRL Calibration at W Band
/forschung/publikationen/effects-degrading-accuracy-of-cpw-mtrl-calibration-at-w-band
On-wafer measurements of a Device Under Test (DUT) can yield accurate results only if the properties of the measurement environment are well defined and unwanted effects can be removed from the data.…
Load Tuning Assisted Discrete-Level Supply Modulation Using BST and GaN Devices for Highly Efficient Power Amplifiers
/forschung/publikationen/load-tuning-assisted-discrete-level-supply-modulation-using-bst-and-gan-devices-for-highly-efficient-power-amplifiers
The combination of supply modulation and load tuning using highly efficient GaN components and very linear thin-film barium-strontium-titanate varactors constitutes an agile and reconfigurable…
Digital Sequential PA for Flexible Efficiency Tuning Over Wide Power Back-Off Range
/forschung/publikationen/digital-sequential-pa-for-flexible-efficiency-tuning-over-wide-power-back-off-range
This paper presents the first digitally designed sequential power amplifier (DSPA) module setup for the 900 MHz range. The demonstrator applies an H-bridge (peak PA) as well as a single-ended…
Modeling the Virtual Gate Voltage in Dispersive GaN HEMTs
/forschung/publikationen/modeling-the-virtual-gate-voltage-in-dispersive-gan-hemts
The main contribution of this paper is to present a direct solution to model the virtual gate voltage describing GaN HEMT dispersion. This virtual gate voltage is related to a fitting parameter,…
An Active High Conversion Gain W-Band Up-Converting Mixer for Space Applications
/forschung/publikationen/an-active-high-conversion-gain-w-band-up-converting-mixer-for-space-applications
This paper presents an active W-band up-converting double-balanced Gilbert mixer realized in 800 nm transferred substrate (TS) InP-DHBT technology. It consists of an active balun and a frequency…
Impact of Drain-Lag Induced Current Degradation for a Dynamically Operated GaN-HEMT Power Amplifier
/forschung/publikationen/impact-of-drain-lag-induced-current-degradation-for-a-dynamically-operated-gan-hemt-power-amplifier
In this paper, the impact of charge trapping effects in a GaN-HEMT power amplifier is analyzed and quantified, using a low complexity model for drain-lag effects. The peak drain-source voltage under…