TY - CONF AB - In this paper, a novel fully digital modulator for a switch mode power amplifier (SMPA) is presented. The modulator converts the input baseband amplitude and phase signals into a two-level pulse train for driving an RF SMPA. The simulation results demonstrated a proof of the concept. The proposed architecture is analyzed in terms of accuracy by measuring EVM. The impact of the modulator parameters on the SMPA performance is investigated and corresponding results are shown. The modulator was simulated with a 20 MHz LTE signal. AU - Ostrovskyy, Philip AU - Scheytt, Christoph AU - Lee, SungJun AU - Park, BongHyuk AU - Jung, JaeHo ID - 24413 T2 - Proc. IEEE Int Circuits and Systems (ISCAS) Symp TI - A fully digital polar modulator for switch mode RF power amplifier ER - TY - JOUR AB - We present a novel graphene-based-device concept for a high-frequency operation: a hot-electron graphene base transistor (GBT). Simulations show that GBTs have high current on/off ratios and high current gain. Simulations and small-signal models indicate that it potentially allows terahertz operation. Based on energy-band considerations, we propose a specific material solution that is compatible with SiGe process lines. AU - Mehr, Wolfgang AU - Dabrowski, Jarek AU - Lemme, Max C. AU - Lippert, Gunther AU - Lupina, Grzegorz AU - Ostling, Mikael AU - Xie, Ya-Hong AU - Scheytt, Christoph ID - 24414 IS - 5 JF - (Refa) FB/IE Zeitschrift für Unternehmensentwicklung und Industrial Engineering TI - Vertical Graphene Base Transistor VL - 33 ER - TY - CONF AB - Millimeter-Wave (mm-W) is considered a potential technology for high-data rate wireless transmission and for high-resolution short-range radar, due to the 7-9 GHz bandwidth at the 60 GHz unlicensed band available worldwide. Developing ultrawideband architectures including multiple-input-multiple-output (MIMO) antenna systems at mm-W offer many advantages including jointly optimized analogue and digital signal processing at carrier frequency and baseband. This allows for flexible antenna designs and reduced losses, as many passive structures can be avoided at both sides of the link. Besides, based on flexible polarimetric approaches, the polarimetric propagation of electromagnetic waves can be exploited. In this paper we present a 60 GHz polarimetric MIMO system architecture, which includes analogue miniaturized frontends designed and manufactured by multi-layer packaging technologies. Such architecture permitted the design of compact MIMO radar and multi-dimensional channel sounding. The MIMO approach allows not only polarimetric filtering and fully polarimetric/directional signal processing to increase the signal-to-clutter-plus-noise ratio of mm-W radar systems, but also the full characterization of wireless channels including multipath with orthogonal polarizations. AU - Garcia-Ariza, Alexis-Paolo AU - Müller, Robert AU - Stephan, Ralf AU - Wollenschläger, Frank AU - Schulz, Alexander AU - Elkhouly, Mohamed AU - Scheytt, Christoph AU - Trautwein, Uwe AU - Müller, Jens AU - Thomae, Reiner AU - Hein, Matthias ID - 24415 T2 - EuCAP2012 (European Conference on Antennas and Propagation) TI - 60 GHz Polarimetric MIMO Sensing: architectures and technology ER - TY - CONF AB - 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. AU - Elkhouly, Mohamed AU - Glisic, Srdjan AU - Ellinger, Frank AU - Scheytt, Christoph ID - 24416 T2 - GeMIC 2012 TI - 120 GHz phased-array circuits in 0.25 µm SiGe BiCMOS technology ER - TY - CONF AB - In recent years, subthreshold operation has become a research focus for digital systems with limited energy budget (e.g. mobile, battery-powered devices, radio frequency identification (RFID), wireless sensor networks, or biomedical applications). Subthreshold operation allows for such low power consumption by reducing the supply voltage of the circuit below the threshold voltage of the transistors. As dynamic power depends quadratically on supply voltage, and static power depends exponentially on supply voltage, considerable power savings are achieved. At the same time propagation delays increase due to reduced transistor currents. Effectively, energy consumption per cycle can typically be reduced by a factor of 10 using subthreshold operation. AU - Luetkemeier, Sven AU - Jungeblut, Thorsten AU - Porrmann, Mario AU - Rückert, Ulrich ID - 24417 T2 - Proc. IEEE Int. Solid-State Circuits Conf. Digest of Technical Papers TI - A 200mV 32b Subthreshold Processor with Adaptive Supply Voltage Control ER - TY - CONF AB - The paper presents a four stage 245 GHz LNA in an f t /f max =280/425 GHz SiGe technology and a 4 th sub harmonic 245 GHz transconductance mixer in an f t /f max =250/300 GHz SiGe technology. The LNA takes advantage of common base (CB) topology for each stage and has 12 dB gain at 245 GHz, while exhibiting a 3 dB bandwidth of 26 GHz. It has a supply voltage of 2V and power dissipation of 28 mW. The transconductance mixer has -7 dB conversion gain at 245 GHz with an LO power of 8 dBm at 61 GHz. The mixer draws 9.8 mA at 3V. Simulation results of the receiver comprising the CB LNA and SHM mixer are given. AU - Mao, Yanfei AU - Schmalz, Klaus AU - Borngräber, Johannes AU - Scheytt, Christoph ID - 24418 T2 - SiRF 2012 (Silicon Monolithic Integrated Circuits in RF Systems) TI - A 245 GHz CB LNA and SHM mixer in SiGe technology ER - TY - CONF AB - In this publication an integrated reflectometer in SiGe BiCMOS technology for sensor readout at 62 GHz is presented. The circuit includes an oscillator, a six-port reflectometer, and a dummy sensor for verification purposes. The circuit has a bandwidth of 8GHz at a center frequency of 62 GHz. It operates at 3.75V supply voltage and consumes 282 mW. The measurement principle is demonstrated and the scattering parameters of the dummy sensor are compared to measurement of a breakout circuit with a commercially available vector network analyzer. The circuit has been fabricated in a 190-GHz SiGe:C BiCMOS technology and occupies an area of 0.9 mm 2 . AU - Laemmle, Benjamin AU - Schmalz, Klaus AU - Scheytt, Christoph AU - Kissinger, Dietmar AU - Weigel, Robert ID - 24419 T2 - SiRF 2012 (Silicon Monolithic Integrated Circuits in RF Systems) TI - A 62GHz Reflectometer for Biomedical Sensor Readout in SiGe BiCMOS Technology ER - TY - CONF AU - Scheytt, Christoph AU - Debski, Wojciech AU - Sun, Yaoming AU - Wang, Ruoyu AU - Winkler, Wolfgang ID - 24420 TI - 122 GHz Radartransceiver und Komponenten in 0.13ym SiGe BiCMOS ER - TY - CONF AB - This paper presents two local navigation strategies for multi-robot systems in performing exploration of unknown environments. The strategies are based on the frontier cell for mapping the environment and navigating in it. Additionally, two coordination strategies are used to solve possible conflicts among robots. Key criteria investigated are the efficiency and effectiveness represented by the completion time, traveled distance, the total steps, and the task distribution. The developed algorithms are tested in simulations as well as in experiments with Khepera III mini robots running on the Teleworkbench. To evaluate the robustness of the developed algorithms, tests are performed under different environmental configurations and varying numbers of robots. The results show the advantages of both proposed strategies in different situations such as environment types and starting positions. AU - Tanoto, Andry AU - Rückert, Ulrich ID - 24422 T2 - From Simulation to Experimentation with Mini-Robots TI - Local Navigation Strategies for Multi-Robot Exploration VL - 41 ER - TY - CHAP AB - One challenging aspect in the development of multi-robot systems is their validation in a real environment. However, experiments with real robots are considerably tedious as experimenting is repetitive and consists of several steps: setup, execution, data logging, monitoring, and analysis. Moreover, experiments also require many resources especially in the case when involving many robots. This paper describes the role of the Teleworkbench as a platform for conducting experiments involving mini robots. The Teleworkbench offers functionality that can help users in validating their robot software from simulation to prototyping using mini robots. A traffic management system is used as a scenario for demonstrating the support of the Teleworkbench for validating multi-robot systems. AU - Tanoto, Andry AU - Werner, Felix AU - Rückert, Ulrich AU - Sitte, Joaquin ID - 24424 T2 - Advances in Autonomous Mini Robots TI - Multi-Robot System Validation: From Simulation to Prototyping with Mini Robots in the Teleworkbench ER - TY - GEN AB - PSSS-Dekodierschaltung, dadurch gekennzeichnet, dass das analoge PSSS-Eingangssignal mit N Spreizsequenzen und N Verknüpfungselementen (z. B. Multiplizierer) verknüpft werden und die Ausgangssignale der N Verknüpfungselemente mit N analogen Integrierern auf integriert werden, dass die Integrierer jeweils zum Beginn der empfangenen Spreizsequenzen gleichzeitig mit dem Signal SYNC zurückgesetzt werden, dass der Integrator über die Dauer einer Code-Sequenz das Eingangssignal auf integriert, dass nach der Integration an den Ausgängen der Integratoren jeweils das dekodierte Datensignal anliegt, dass die Ausgangssignale der Integrierer mit N parallelen einem AD-Wandler digitalisiert werden. AU - Scheytt, Christoph ID - 24425 TI - Mixed-Signal PSSS-Empfänger ER - TY - CONF AU - Sun, Yaoming AU - Beer, Stefan AU - Scheytt, Christoph AU - Wang, Ruoyu AU - Zwick, Thomas ID - 24543 T2 - RF-MST Cluster Workshop on MEMSWAVE 2012 TI - mm-Wave SOC and SIP Design for 122 GHz Radar SSensor in the EU-FP7 Project SUCCESS ER - TY - CONF AB - Design of a 40 Gb/s VCSEL driver IC capable of providing up to 10mA current to common-cathode VCSELs is presented. Using low-power bandwidth enhancement techniques, a prototype IC is successfully developed in 180-GHz SiGe BiCMOS technology. Measured results show 34 GHz of bandwidth, open eye diagram with rise/fall time below 10 ps, and power dissipation of 130 mW. AU - Sedighi, Behnam AU - Scheytt, Christoph ID - 24544 T2 - Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International TI - 40 Gb/s VCSEL driver IC with a new output current and pre-emphasis adjustment method ER - TY - CONF AB - this paper presents a new circuit for high-speed BiCMOS track-and-holds. The proposed approach improves the signal feedthrough in the hold mode and the bandwidth in the tracking mode. A prototype circuit is implemented in a 0.13 µm BiCMOS technology, operating at 10 GS/s and consuming 19 mW from 3.3 V supply. It is shown that the circuit is capable of providing a harmonic distortion below −50 dB. AU - Sedighi, Behnam AU - Borokhovych, Yevgen AU - Gustat, Hans AU - Scheytt, Christoph ID - 24545 T2 - Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International TI - Low-power BiCMOS track-and-hold circuit with reduced signal feedthrough ER - TY - CONF AB - this paper investigates low-power design of high-speed and high-swing electronic driver circuits. A method to estimate and optimize the power consumption of such driver ICs is presented. A 20-Gb/s driver circuit is fabricated in 0.25 µm SiGe BiCMOS process and an output swing of 2.5 V pp is measured. The driver consumes 0.75 W from 5 V supply. AU - Sedighi, Behnam AU - Ostrovskyy, Philip AU - Scheytt, Christoph AU - Stille, Karl Stephan Christian AU - Böcker, Joachim ID - 24546 T2 - Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International TI - Low-power 20-Gb/s SiGe BiCMOS driver with 2.5 V output swing ER - TY - CONF AU - Joy, M. tech. Mabel Mary AU - Becker, Markus AU - Mathews, Emi AU - Müller, Wolfgang ID - 25744 T2 - In Proceedings of Advanced Computing and Communications Conference 2012 (ADCOM 2012) TI - Automated Source Code Annotation for Timing Analysis of Embedded Software ER - TY - CONF AU - Mauerer, Wolfgang AU - Hillier, Gernot AU - Sawallisch, Jan AU - Hönick, Stefan AU - Oberthür, Simon ID - 25749 T2 - Proceedings of Embedded Linux Conference Europe, 5. - 7. Nov. 2012 TI - Real-Time Android: Deterministic Ease of Use ER - TY - CONF AU - Mathews, Emi AU - Graf, Tobias AU - Kulathunga, K. S. S. B. ID - 25752 T2 - In Proceedings of IEEE International Conference on Systems, Man, and Cybernetics (SMC 2012) TI - Biologically Inspired Swarm Robotic Network Ensuring Coverage and Connectivity ER - TY - CONF AU - Becker, Markus AU - Baldin, Daniel AU - Kuznik, Christoph AU - Joy, M. tech. Mabel Mary AU - Xie, Tao AU - Müller, Wolfgang ID - 25758 T2 - EMSOFT'12: Teenth ACM International Conference on Embedded Software 2012 Proceedings TI - XEMU: An Efficient QEMU Based Binary Mutation Testing Framework for Embedded Software ER - TY - CONF AU - Oliveira, Marcio F. AU - Kuznik, Christoph AU - Le, Hoang M. AU - Große, Daniel AU - Haedicke, Finn AU - Müller, Wolfgang AU - Drechsler, Rolf AU - Ecker, Wolfgang AU - Esen, Volkan ID - 25761 T2 - CODES/ISSS '12: Eighth IEEE/ACM/IFIP International Conference on Hardware/Software Codesign and System Synthesis Proceedings TI - The System Verification Methodology for Advanced TLM Verification ER -