@inproceedings{24342, abstract = {{Two half-wavelength 122 GHz patch antennas were designed and manufactured by using Benzocyclobutene (BCB) as a dielectric layer above the SiGe BiCMOS wafer. It enables the full integration of the millimeter-wave transceiver circuits and the antennas on a single chip to simplify the packaging procedure at millimeter-wave frequencies, thereby reducing the cost. The two patch antennas are fed by different feeding methods, i.e. microstrip transmission line direct feed and proximity-coupled feed. They exhibit similar performance and offer the flexibility of designing the interconnects (feed lines routing) between the circuits and the antennas within the very limited chip area. The measured gain is 3.4 dBi at 122.5 GHz (the center frequency of the ISM band of 122-123 GHz) for both designs with a simulated efficiency of about 50%.}}, author = {{Wang, Ruoyu and Kaynak, Mehmet and Sun, Yaoming and Borngräber, Johannes and Beer, Stefan and Goettel, B. and Scheytt, Christoph}}, booktitle = {{24th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications}}, title = {{{122 GHz Patch Antenna Designs by Using BCB Above SiGe BiCMOS wafer process for system-on-chip applications}}}, doi = {{10.1109/PIMRC.2013.6666358}}, year = {{2013}}, } @article{24347, abstract = {{In this paper, an integrated dielectric sensor with a read-out circuit in an unmodified SiGe BiCMOS technology at 125 GHz is presented. The sensor consists of a 500-μm shorted half-wave coplanar-waveguide transmission line in the uppermost metal layer of the silicon process, while the read-out is obtained by reflection coefficient measurement with an integrated reflectometer and a signal source. The reflectometer is verified with a circuit breakout including an integrated dummy sensor. The reflectometer is able to measure the phase of the reflection coefficient from 117 to 134 GHz with a resolution of 0.1° and a standard deviation of 0.082°. The integrated sensor with the reflectometer circuit have been fabricated in a 190-GHz fT SiGe:C BiCMOS technology. It spans an area of 1.4 mm 2 and consumes 75 mA from a 3.3-V supply. The circuit has been assembled on a printed circuit board for characterization by immersion into test liquids. The sensor is controlled by a controller board and a personal computer enabling a measurement time of up to 1 ms per frequency point. Functionality of the sensor is demonstrated from 118 to 133 GHz with immersion of the sensor into different binary methanol-ethanol mixtures, showing good correlation between theory and measurement. The sensor shows a standard deviation of the measured phase of 0.220° and is able to detect a difference in ε' r of 0.0125}}, author = {{Laemmle, Benjamin and Schmalz, Klaus and Scheytt, Christoph and Weigel, Robert and Kissinger, Dietmar}}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{5}}, pages = {{2185--2194}}, title = {{{A 125-GHz Permittivity Sensor With Read-Out Circuit in a 250-nm SiGe BiCMOS Technology}}}, doi = {{10.1109/TMTT.2013.2253792}}, volume = {{61}}, year = {{2013}}, } @inproceedings{24348, author = {{Scheytt, Christoph and Grau, Günter}}, booktitle = {{Wissenschaftsforum 2013, Intelligente Technische Systeme, Heinz Nixdorf Institut}}, title = {{{Neue Ansätze für miniaturisierte, hochintegrierte Abstands-, Geschwindigkeits- und Drehwinkelsensoren}}}, year = {{2013}}, } @inproceedings{24346, author = {{Scheytt, Christoph}}, booktitle = {{System, IC and Integrated Antenna Design for Miniaturized, Millimeter-wave Radar Sensors}}, title = {{{Introduction to Integrated mm‐Wave Sensors}}}, year = {{2013}}, } @article{24350, abstract = {{This paper describes the design of D-band phased-array circuits in 0.25 μm technology. The first part describes the design of the passive components which are used in the phased-array systems such as balun, Wilkinson divider and branch-line coupler. A millimeter-wave vector-modulator is designed to support both amplitude and phase control for beam-forming applications. In the second part the designed circuits are integrated together to form a two channel 110-130 GHz phased-array chip. Each channel exhibits 360° phase control with 15 dB of amplitude control range and gain of -10 dB. The entire chip draws 45 mA from 3.3 V supply. The millimeter-wave phase shifting and the low-power consumption makes it ideal for highly integrated scalable beam-forming systems for both imaging and communication.}}, author = {{Elkhouly, Mohamed and Glisic, Srdjan and Meliani, Chafik and Ellinger, Frank and Scheytt, Christoph}}, journal = {{Microwave Theory and Techniques, IEEE Transactions on}}, number = {{99}}, pages = {{1--13}}, title = {{{220–250-GHz Phased-Array Circuits in 0.13- \mu\hbox m SiGe BiCMOS Technology}}}, doi = {{10.1109/TMTT.2013.2258032}}, volume = {{PP}}, year = {{2013}}, } @article{24352, abstract = {{This paper analyses substrate-related spurious tones in fractional-N phase- locked loops with integrated VCOs. Spur positions are calculated and experimentally verified as a function of the divider ratios of prescaler and programmable divider. For an integrated wideband PLL in SiGe BiCMOS technology the spur power levels are measured and compared with theoretical expectations. The power in these spurs is minimized by layout techniques shielding the reference input buffer. Spur minimization by using a variable reference frequency is experimentally demonstrated. Based on this observation, a programmable integer-N PLL for driving the fractional-N synthesizer is suggested to reduce the worst-case spur level significantly. Index Terms — Fractional-N, frequency synthesizers, fractional spurs, substrate spurs, phase-locked loops (PLLs), phase noise. }}, author = {{Osmany, Sabbir Ahmed and Herzel, Frank and Scheytt, Christoph}}, journal = {{Analog Integrated Circuits and Signal Processing}}, number = {{3}}, pages = {{545--556}}, title = {{{Analysis and minimization of substrate spurs in fractional-N frequency synthesizers}}}, doi = {{10.1007/s10470-012-0002-x}}, volume = {{74}}, year = {{2013}}, } @inproceedings{24349, abstract = {{This paper presents the packaging technology and the integrated antenna design for a miniaturized 122-GHz radar sensor. The package layout and the assembly process are shortly explained. Measurements of the antenna including the flip chip interconnect are presented that have been achieved by replacing the IC with a dummy chip that only contains a through-line. Afterwards, radiation pattern measurements are shown that were recorded using the radar sensor as transmitter. Finally, details of the fully integrated radar sensor are given, together with results of the first Doppler measurements.}}, author = {{Beer, Stefan and Girma, Mekdes Gebresilassie and Sun, Yaoming and Winkler, Wolfgang and Debski, Wojciech and Paaso, Jaska and Kunkel, Gerhard and Scheytt, Christoph and Hasch, Jürgen and Zwick, Thomas}}, booktitle = {{7th EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION}}, title = {{{Flip-Chip Package with Integrated Antenna on a Polyimide Substrate for a 122-GHz Bistatic Radar IC}}}, year = {{2013}}, } @inproceedings{29491, author = {{Gail, T. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{43--44}}, title = {{{Computing time investigations for variational multirate integration}}}, volume = {{13(1)}}, year = {{2013}}, } @inbook{29419, author = {{Schütze, O. and Witting, K. and Ober-Blöbaum, Sina and Dellnitz, M. and Tantar, Emilia}}, booktitle = {{EVOLVE - A Bridge Between Probability, Set Oriented Numerics, and Evolutionary Computation}}, pages = {{187--219}}, publisher = {{Springer}}, title = {{{Set oriented methods for the numerical treatment of multi-objective optimization problems}}}, year = {{2013}}, } @inbook{29418, author = {{Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Jean-Claude Samin and Paul Fisette, editors, Multibody Dynamics}}, pages = {{97--121}}, publisher = {{Springer}}, title = {{{A variational approach to multirate integration for constrained systems}}}, volume = {{28}}, year = {{2013}}, } @inproceedings{29441, author = {{Flaßkamp, K. and Ober-Blöbaum, Sina and Schneider, T. and Böcker, J. }}, booktitle = {{52nd IEEE International Conference on Decision and Control }}, location = {{Florence, Italy}}, pages = {{7467--7472}}, title = {{{Optimal control of a switched reluctance drive by a direct method using a discrete variational principle}}}, year = {{2013}}, } @inproceedings{29443, author = {{Ober-Blöbaum, Sina and Seifried, A. }}, booktitle = {{European Control Conference}}, location = {{Zurich, Switzerland}}, pages = {{204--209}}, title = {{{A multiobjective optimization approach for optimal control problems of mechanical systems with uncertainties}}}, year = {{2013}}, } @inproceedings{29442, author = {{Flaßkamp, K. and Murphey, T. and Ober-Blöbaum, Sina}}, booktitle = {{European Control Conference}}, location = {{Zurich, Switzerland}}, pages = {{3179--3184}}, title = {{{Discretized switching time optimization problems}}}, year = {{2013}}, } @inproceedings{29447, author = {{Specht, A. and Ober-Blöbaum, Sina and Wallscheid, O. and Romaus, C. and Böcker, J. }}, booktitle = {{IEEE International Electric Machines & Drives Conference (IEMDC)}}, pages = {{1411--1417}}, title = {{{Discretetime model of an IPMSM based on variational integrators}}}, year = {{2013}}, } @inproceedings{29446, author = {{Ringkamp, M. and Ober-Blöbaum, Sina and Leyendecker, S.}}, booktitle = {{ECCOMAS Thematic Conference on Multibody Dynamics}}, title = {{{A numerical approach to multiobjective optimal control of multibody dynamics}}}, year = {{2013}}, } @inproceedings{29444, author = {{Demoures, F. and Gay-Balmaz, F. and Leitz, T. and Leyendecker, S. and Ober-Blöbaum, Sina and Ratiu, T.S. }}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{45--46}}, title = {{{Asynchronous variational Lie group integration for geometrically exact beam dynamics}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29492, author = {{Ringkamp, M. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{27--28}}, title = {{{Multiobjective optimal control of a four-body kinematic chain}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29445, author = {{Gail, T. and Leyendecker, S. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{43--44}}, title = {{{Computing time investigations of variational multirate systems}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{29490, author = {{Flaßkamp, K. and Murphey, T. and Ober-Blöbaum, Sina}}, booktitle = {{Proceedings of Applied Mathematics and Mechanics}}, pages = {{401--402}}, title = {{{Optimization for discretized switched systems}}}, volume = {{13(1)}}, year = {{2013}}, } @inproceedings{11832, abstract = {{In this paper we propose an approach to retrieve the absolute geometry of an acoustic sensor network, consisting of spatially distributed microphone arrays, from reverberant speech input. The calibration relies on direction of arrival measurements of the individual arrays. The proposed calibration algorithm is derived from a maximum-likelihood approach employing circular statistics. Since a sensor node consists of a microphone array with known intra-array geometry, we are able to obtain an absolute geometry estimate, including angles and distances. Simulation results demonstrate the effectiveness of the approach.}}, author = {{Jacob, Florian and Schmalenstroeer, Joerg and Haeb-Umbach, Reinhold}}, booktitle = {{38th International Conference on Acoustics, Speech, and Signal Processing (ICASSP 2013)}}, issn = {{1520-6149}}, keywords = {{Geometry calibration, microphone arrays, position self-calibration}}, pages = {{116--120}}, title = {{{DoA-Based Microphone Array Position Self-Calibration Using Circular Statistic}}}, doi = {{10.1109/ICASSP.2013.6637620}}, year = {{2013}}, }