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@inproceedings{faucris.122448304,
author = {Stumpf, Christopher and Frank, Tobias and Vester, Markus and Martius, Siegfried and Rehner, Robert and Engelbrecht, Rainer and Schmidt, Lorenz-Peter},
booktitle = {Intl. Soc. Mag. Reson. Med. 22th},
faupublication = {yes},
note = {lhft{\_}intern.bib::Stumpf2014},
peerreviewed = {Yes},
title = {{Current} limited superconducting {RF} coils},
venue = {Milan},
year = {2014}
}
@article{faucris.113986224,
abstract = {An electrical large-signal circuit model for a 30-W high-power laser diode module is presented. Such modules are designed primarily for continuous wave (cw) operation but can be pulsed in the sub-\mu{\rm s} temporal range for special applications. Our model is thus valid up to 20 MHz in the electrical frequency domain. The elements of the circuit model have been derived from RF impedance measurements using a calibrated vector network analyzer and a high-current dc/RF bias-T. The impedance is dominated by the inductance of the high-current connecting leads from the laser driver to the laser chip. The skin effect has been found to influence considerably both resistive and inductive impedances at high frequencies. For large-signal circuit simulations in the time domain, the current-voltage characteristic of the diode p-n junction is included by an analytic equation. The model is verified by comparison of simulation results with measured currents, voltages, and laser powers in large-signal pulsed-mode operation. This model is well suited for the design of optimized pulsed-current driver circuits. © 1989-2012 IEEE.},
author = {Engelbrecht, Rainer and Groh, Jannis and Stumpf, Christopher and Adametz, Julian and Schmauß, Bernhard},
doi = {10.1109/LPT.2014.2304299},
faupublication = {yes},
journal = {IEEE Photonics Technology Letters},
keywords = {Circuit modeling; Equivalent circuits; High-power laser diode; Impedance measurement; Large-signal; Optical pulses; Parameter extraction; Radio-frequency; Simulation},
note = {UnivIS-Import:2015-03-09:Pub.2014.tech.IE.LEH.larges},
pages = {761-764},
peerreviewed = {Yes},
title = {{Large}-{Signal} {RF} {Circuit} {Model} for a {High}-{Power} {Laser} {Diode} {Module}},
volume = {26},
year = {2014}
}
@misc{faucris.255208117,
abstract = {The numerical calculation of the signal-to-noise ratio (SNR) of magnetic
resonance imaging (MRI) coil arrays is a powerful tool in the
development of new coil arrays. The proposed method describes a complete
model that allows the calculation of the absolute SNR values of
arbitrary coil arrays, including receiver chain components. A new method
for the SNR calculation of radio frequency receive coil arrays for MRI
is presented, making use of their magnetic B1−" role="presentation">B−1 transmit pattern and the S-parameters of the network. The S-parameters and B1−" role="presentation">B−1
fields are extracted from an electromagnetic field solver and are
post-processed using our developed model to provide absolute SNR values.
The model includes a theory for describing the noise of all components
in the receiver chain and the noise figure of a pre-amplifier by a
simple passive two-port network. To validate the model, two- and
four-element receive coil arrays are investigated. The SNR of the
examined arrays is calculated and compared to measurement results using
imaging of a saline water phantom in a 3 T" role="presentation">3 T
scanner. The predicted values of the model are in good agreement with
the measured values. The proposed method can be used to predict the
absolute SNR for any receive coil array by calculating the transmit B1−" role="presentation">B−1
pattern and the S-parameters of the network. Knowledge of the
components of the receiver chain including pre-amplifiers leads to
satisfactory results compared to measured values, which proves the
method to be a useful tool in the development process of MRI receive
coil arrays.},
author = {Stumpf, Christopher and Malzacher, Matthias and Schmidt, Lorenz-Peter},
doi = {10.3390/jimaging4050067},
faupublication = {yes},
keywords = {receive coil array; SNR modeling; MRI; pre-amplifier noise; noise coupling},
peerreviewed = {Yes},
title = {{Radio} {Frequency} {Modeling} of {Receive} {Coil} {Arrays} for {Magnetic} {Resonance} {Imaging}},
year = {2018}
}