Inst. Hochfrequenz- und Halbleiter-Systemtechnologien

190 Items

Recent Submissions
Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technology

Georgieva, Galina ; Voigt, Karsten ; Peczek, Anna ; Mai, Christian ; Zimmermann, Lars (2020-04-08)

Focusing grating couplers for the excitation of the fundamental transverse-magnetic (TM) mode in integrated silicon photonic waveguides are designed and characterized under the boundary conditions of a photonic BiCMOS foundry. Two types of waveguide geometries are considered – a nanowire and a rib waveguide. Wafer-scale experimental results for nanowire TM grating couplers are in excellent agre...

MM-wave RF-MEMS switches in SiGe BiCMOS technologies

Tolunay Wipf, Selin (2020)

In the last decade, silicon germanium (SiGe) bipolar complementary metal oxide semiconductor (BiCMOS) technologies opened a new cost-efficient market for the mm-wave applications. Starting with the commercial use of automotive radars at 77 GHz, the market now has a strong interest on radar, sensor and imaging products at mm-wave and sub-THz frequencies. The latest developments on SiGe hetero bi...

Tunable lasers on a polymer-based hybrid photonic integration platform

de Felipe Mesquida, David (2020)

Durchstimmbare Halbleiterlaser als miniaturisierte optische Quellen mit der Fähigkeit bei verschiedenen Wellenlängen zu emittieren sind Schlüsselelemente in diversen Anwendungen, von Telekommunikation bis Sensorik. Viele Ansätze wurden in der Literatur untersucht um integrierte Lösungen anzubieten, die sowohl ihre Miniaturisierung als auch ihre Kointegration mit anderen optischen Funktionalität...

Development of metal oxide thin films as carrier selective contacts for silicon heterojunction solar cells

Chistiakova, Ganna (2020)

The main focus of this thesis is on metal oxide layers and their possible implementation as carrier selective contacts in silicon heterojunction (SHJ) solar cells. The dominant topics in this work are the development of deposition processes for such metal oxide layers and their further analysis, covering layer composition, layer properties and their interface with perovskite, crystalline silico...

Vibrational dynamics in lead halide hybrid perovskites investigated by Raman spectroscopy

Ibaceta-Jaña, Josefa ; Muydinov, Ruslan ; Rosado, Pamela ; Mirhosseini, Hossein ; Chugh, Manjusha ; Nazarenko, Olga ; Dirin, Dmitry N. ; Heinrich, Dirk ; Wagner, Markus R. ; Kühne, Thomas D. ; Szyszka, Bernd ; Kovalenko, Maksym V. ; Hoffmann, Axel (2020-02-26)

Lead halide perovskite semiconductors providing record efficiencies of solar cells have usually mixed compositions doped in A- and X-sites to enhance the phase stability. The cubic form of formamidinium (FA) lead iodide reveals excellent opto-electronic properties but transforms at room temperature (RT) into a hexagonal structure which does not effectively absorb visible light. This metastable ...

Design of CMOS circuits for a 24 GHz FMCW radar receiver

Ding, Yaoshun (2020)

In this work, contributions to the development of a 24 GHz CMOS receiver for frequency-modulated continuous-wave (FMCW) radar front-ends are presented. At the beginning, based on the behavior models of circuit blocks, the FMCW radar transceiver is analyzed and simulated on system level. After a brief review of the 65 nm standard CMOS technology, characterization and modeling of transistors and ...

Electron-beam-induced current measurements with applied bias provide insight to locally resolved acceptor concentrations at p-n junctions

Abou-Ras, Daniel ; Schaefer, Norbert ; Baldaz, N. ; Brunken, Stephan ; Boit, Christian (2015-07-31)

Electron-beam-induced current (EBIC) measurements have been employed for the investigation of the local electrical properties existing at various types of electrical junctions during the past decades. In the standard configuration, the device under investigation is analyzed under short-circuit conditions. Further insight into the function of the electrical junction can be obtained when applying...

Flexibler Modulator und Digitalverstärker-MMIC für den energieeffizienten Betrieb einer digitalen Sendekette im GHz-Bereich

Hühn, Florian (2020)

Schaltverstärker für Mikrowellenanwendungen versprechen gegenüber analogen Verstärkern ein hohes Energieeinsparungspotential, deutlich gesteigerte Flexibilität, z.B. in Form von maximaler Frequenzagilität und Einsparungsmöglichkeiten bei Volumen und Gewicht, sowie geringere Empfindlichkeit gegenüber Bauteiltoleranzen. Bislang konnten diese Vorzüge in der Praxis jedoch nicht genutzt werden, da d...

Impact of stochastic transmission effects on the design of digital back propagation

Goroshko, Kseniia (2020)

During the last three decades optical telecommunications industry is constantly pushing for new data transmission capacity limits. With a nowadays paradigm of coherent communication, one of the ways to increase the data rates is closely related to increasing the signal transmission power. That in turns allows reaching higher optical signal-to-noise ratio (OSNR). An intrinsic part of this soluti...

Impairment analysis and mitigation for cost-effective OFDM-based access systems

Duarte Sequeira André, Nuno Miguel (2020)

The growth in broadband connection speed has been exponential, and this trend will continue in the foreseeable future [1]. An access network is a connection between users and service providers and therefore a key element in support of this growth. While expanding its broadband offer a service provider must ensure seamless migration through compatibility with legacy networks, and also create an ...

Fully integrated 240 GHz transmitter and receiver for high data rate communication

Eissa, Mohamed Hussein (2020)

The need for higher data rate wireless communication is increasing rapidly for different kind of applications. Hence the utilization of the wide and unallocated band above 200 GHz opens a lot of opportunities to serve these applications. This work presents the design, implementation and demonstration of fully integrated transmitter and receiver circuits for wireless communication at 240 GHz car...

Investigation of the Mechanical and Electrical Properties of Elastic Textile/Polymer Composites for Stretchable Electronics at Quasi-Static or Cyclic Mechanical Loads

Dils, Christian ; Werft, Lukas ; Walter, Hans ; Zwanzig, Michael ; Krshiwoblozki, Malte von ; Schneider-Ramelow, Martin (2019-11-01)

In the last decade, interest in stretchable electronic systems that can be bent or shaped three-dimensionally has increased. The application of these systems is that they differentiate between two states and derive there from the requirements for the materials used: once formed, but static or permanently flexible. For this purpose, new materials that exceed the limited mechanical properties of ...

Fully integrated BiCMOS high-voltage driver circuits for on-chip RF-MEMS switch matrices

Wipf, Christian (2019)

In this work, building blocks required to control electrostatically actuated radio frequency micro- electro- mechanical system (RF-MEMS) matrices were developed and integrated into demonstrator circuits. The realized chips include the high-voltage (HV) generation and switching units integrated together with the RF-MEMS switches. To the author’s knowledge, this work is the first to present monol...

Untersuchung der Degradation von InAlGaN-basierten ultravioletten Leuchtdioden zur Verbesserung der Zuverlässigkeit

Glaab, Johannes (2019)

Zentraler Bestandteil dieser Arbeit ist die Untersuchung des Degradationsverhaltens von ultravioletten (UV) Leuchtdioden (LEDs), die im UV-C (200 nm bis 280 nm) und UV-B (280 nm bis 340 nm) Spektralbereich emittieren. Als Degradationsverhalten ist dabei die Änderung von elektrooptischen Parametern, wie beispielsweise der optischen Leistung oder der Strom-Spannungskennlinie im Betrieb bei konsta...

Laser-based attacks on secure integrated circuits

Lohrke, Heiko (2019)

To defend against attackers, knowledge about their approach is helpful. This work evaluates attacks on integrated circuits (ICs) using laser scanning microscopes (LSMs) in combination with semiconductor failure analysis (FA) techniques. It identifies likely attack paths, develops suitable setups, and tests attack feasibility. All attacks are performed through the silicon backside. Three main at...

Optimierung von koplanaren GaN-MMIC-Leistungsverstärkern im X-Band

Ersoy, Erhan (2019)

Seit der Erfindung des Transistors haben diese Halbleiter-Bauteile mit fortschreitender Entwicklung die bis dato in Verstärkern verwendeten Bauteile, die Elektronenröhren, immer mehr verdrängt. Als ein weiterer Schritt dieser Entwicklung findet im X-Band (8 bis 12 GHz) die Verdrängung in Radar- und Satellitenanwendungen statt. Für den Einsatz in solchen Anwendungen werden Leistungsverstärker in...

Schaltungsentwurf und Aufbautechnologie hocheffizienter GaN-HEMT Leistungsverstärker in MIC-Technologie

Rautschke, Felix (2019)

Diese Dissertation ist das Ergebnis von mehr als drei Jahren Forschung und Entwicklung an der Technischen Universität Berlin, Fachgebiet Mikrowellentechnik. Während dieser Zeit wurden hochfrequente, hybride Leistungsverstärker auf Basis von Gallium-Nitrid HEMT Technologie der Firma Wolfspeed im Ku-Band und X-Band entwickelt und aufgebaut. Das hybride Design der Verstärkerstufen stützt sich auf ...

High-performance transceiver front-ends in SiGe technologies for 400Gb/s optical links

García López, Iria (2019)

Die optische Glasfaserkommunikation ist ein wichtiger Bestandteil in der heutigen industriellen Entwicklung und des wirtschaftlichen Fortschrittes in unserer modernen Gesellschaft geworden. Um die Anforderungen des zunehmenden Datenverkehrs zu erfüllen, die für Anwendungen wie das Internet der Dinge (IoT) und Cloud-Computing benötigt werden, müssen die Bandbreite, die Leistungsaufnahme und die ...

SiGe BiCMOS integrated circuits for optical communication transmitters

Vieira Rito, Pedro Filipe (2019)

Telecommunications play a crucial role in our daily lives, not only because of their significance in allowing interaction between all of us, but also due to the forthcoming expansion of connection and exchange of data between machines, the so-called Internet of Things (IoT), which will result in a massive network of thousands of millions of devices around the world. Such growth of the internet ...

Design and Fabrication of a BiCMOS Dielectric Sensor for Viscosity Measurements: A Possible Solution for Early Detection of COPD

Soltani Zarrin, Pouya ; Jamal, Farabi Ibne ; Guha, Subhajit ; Wessel, Jan ; Kissinger, Dietmar ; Wenger, Christian (2018-08-21)

The viscosity variation of sputum is a common symptom of the progression of Chronic Obstructive Pulmonary Disease (COPD). Since the hydration of the sputum defines its viscosity level, dielectric sensors could be used for the characterization of sputum samples collected from patients for early diagnosis of COPD. In this work, a CMOS-based dielectric sensor for the real-time monitoring of sputum...