Inst. Hochfrequenz- und Halbleiter-Systemtechnologien

133 Items

Recent Submissions
24 GHz low-power switch-channel CMOS transceiver for wireless localization

Zhang, Tao ; Hamidian, Amin ; Shu, Ran ; Subramanian, Viswanathan (2014)

A 24 GHz low-power transceiver is designed, fabricated, and characterized using 130 nm complementary metal-oxide semiconductor (CMOS) process. The designed transceiver is targeted for frequency-modulated-continuous-wave (FMCW) wireless local positioning. The transceiver includes four switchable receiving channels, one transmitting channel and local-oscillator generation circuitries. Several pow...

Evaluation of GaN-HEMT power amplifiers using BST-based components for load modulation

Arnous, Mhd. Tareq ; Wiens, Alex ; Saad, Paul ; Preis, Sebastian ; Zhang, Zihui ; Jakoby, Rolf ; Böck, Georg (2014)

In this paper, the concept of load-modulated power amplifiers (PAs) is studied. Two GaN-HEMT power amplifiers (PAs), targeted for high efficiency at maximum and output back-off (OBO) power levels, are designed, implemented, and tested across 1.8–2.2 GHz. The load modulation in the first design is realized by tuning the shunt capacitors in the output matching network. A novel method is employed ...

Design and analysis of 80-W wideband asymmetrical Doherty amplifier

Bathich, Khaled ; Böck, Georg (2014)

This paper presents the analysis and design of a wideband asymmetrical Doherty amplifier. The frequency response of the output combining network of the Doherty amplifier with arbitrary back-off level configuration is analyzed. Other bandwidth-limiting factors were discussed and analyzed as well. A number of performance enhancement techniques were taken into consideration to obtain high and flat...

A 60 GHz fully differential LNA in 90 nm CMOS technology

Malignaggi, Andrea ; Hamidian, Amin ; Böck, Georg (2013)

The present paper presents a fully differential 60 GHz four stages low-noise amplifier for wireless applications. The amplifier has been optimized for low-noise, high-gain, and low-power consumption, and implemented in a 90 nm low-power CMOS technology. Matching and common-mode rejection networks have been realized using shielded coplanar transmission lines. The amplifier achieves a peak small-...

Efficient technique for ultra broadband, linear power amplifier design

Sayed, Ahmed ; Preis, Sebastian ; Böck, Georg (2012)

In this paper, a 10 W ultra-broadband GaN power amplifier (PA) is designed, fabricated, and tested. The suggested design technique provides a more accurate starting point for matching network synthesis and better prediction of achievable circuit performance. A negative-image model was used to fit the extracted optimum impedances based on source-/load-pull technique and multi-section impedance m...

Future recycling flows of tellurium from cadmium telluride photovoltaic waste

Marwede, Max ; Reller, Armin (2012)

According to the European Photovoltaic Industry Association, photovoltaic energy has the potential to contribute up to 13% to the global electricity supply by 2040. A part of this electricity production will come from thin-film photovoltaic technologies. From various thin-film technologies available on the market today, low-cost cadmium telluride photovoltaics (CdTe-PV) can be considered the ma...

Four wave mixing at 1550 nm in silicon waveguides

Gajda, Andrzej (2017)

Traffic in data communication networks has seen continuous growth over many decades. Taking the example of transport networks we observe a growth rate of about 60% per year in capacity. The increase in traffic is supported by various technologies but mainly driven by applications related to social media, moving images, internet of things etc. An important contender for future increase of fiber ...

Micro-integrated diode laser modules for quantum optical sensors in space

Kohfeldt, Anja (2017)

Quantum sensors are rely on laser technology for preparation and for manipulation of their quantum probes. With the endeavour of operating quantum sensors in micro-gravity in order to gain measurement precision, laser technology has to be developed further to meet the new requirements. In addition to high frequency stability at specific wavelengths and sufficient optical output power, the laser...

Performance analysis of low jitter high-speed photonic analog-to-digital converters in silicon photonics

Krune, Edgar (2017)

The performance of electronic analog-to-digital converters (ADCs) is mainly limited by the sampling instant precision if high-frequency signals are sampled. Its uncertainty is called timing jitter. The electrical clock generation and its distribution on chip are limited to a jitter of 100 fs and no significant improvement was achieved in the last decade. Physical restrictions prevent its furthe...

On-chip automation of cell-free protein synthesis: new opportunities due to a novel reaction mode

Georgi, V. ; Georgi, Leopold ; Blechert, Martin ; Bergmeister, Merlin ; Zwanzig, Michael ; Wüstenhagen, Doreen A. ; Bier, Frank F. ; Jung, Erik ; Kubick, Stefan (2016)

Many pharmaceuticals are proteins or their development is based on proteins. Cell-free protein synthesis (CFPS) is an innovative alternative to conventional cell based systems which enables the production of proteins with complex and even new characteristics. However, the short lifetime, low protein production and expensive reagent costs are still limitations of CFPS. Novel automated microfluid...

Exceptional long-life performance of lithium-ion batteries using ionic liquid-based electrolytes

Elia, Giuseppe Antonio ; Ulissi, Ulderico ; Jeong, Sangsik ; Passerini, Stefano ; Hassoun, Jusef (2016)

Advanced ionic liquid-based electrolytes are herein characterized for application in high performance lithium-ion batteries. The electrolytes based on either N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide (Pyr(14)TFSI), N-butyl-N-methylpyrrolidinium bis(fluoro-sulfonyl) imide (Pyr(14)FSI), N-methoxy-ethyl-N-methylpyrrolidinium bis(trifluoromethane-sulfonyl) imide (Pyr(12O1)TF...

Fabrication and characterization of nanotextures for light management in photovoltaic and optoelectronic devices

Jošt, Marko (2017)

Light management is an important aspect of photovoltaics to assure efficient exploitation of solar energy and improve the efficiency of solar cells. Efficient light management is based on anti-reflection and light scattering. The former results in increased light in-coupling, and the latter prolongs the optical path in the active layer of a solar cell; consequently, the conversion efficiency in...

Interdigitated back-contacts for poly-crystalline thin-film silicon solar cells on glass

Sonntag, Paul (2017)

This thesis is about the liquid phase crystallization (LPC) technology to produce solar cell absorbers of 10 − 40 µm thickness directly on glass, the development of interdigitated back-contact (IBC)-silicon hetero-junction (SHJ) solar cells thereon and the evaluation of material parameters and future prospects of the LPC technology. The latter is a new hybrid technology between wafers and class...

Waveguide integrated MQW p-i-n photodiodes

Zhou, Gan (2017)

In this work, waveguide integrated multiple quantum well p-i-n photodiodes are developed and characterized. Compared to bulk photodiodes, multiple quantum well photodiodes have special properties including a large and tunable polarization dependent loss. It makes multiple quantum well photodiodes a potential candidate for various applications, especially in polarization-diversity coherent optic...

Fiber optical parametric amplifiers in optical communication systems

Marhic, Michel E. ; Andrekson, Peter A. ; Petropoulos, Periklis ; Radic, Stojan ; Peucheret, Christophe ; Jazayerifar, Mahmoud (2015)

The prospects for using fiber optical parametric amplifiers (OPAs) in optical communication systems are reviewed. Phase-insensitive amplifiers (PIAs) and phase-sensitive amplifiers (PSAs) are considered. Low-penalty amplification at/or near 1 Tb/s has been achieved, for both wavelength- and time-division multiplexed formats. High-quality mid-span spectral inversion has been demonstrated at 0.64...

Liquid phase crystallized silicon on sinusoidal textured glass substrates

Köppel, Grit (2017)

The aim of this thesis is to identify a light trapping scheme for liquid phase crystallized silicon thin-film solar cells providing anti-reflective properties in the wavelength range of interest and to demonstrate its suitability for maintaining the silicon material quality. Since the silicon material quality is mainly determined by the crystallization step, the interplay between a substrate te...

Contactless visible light probing for nanoscale ICs through 10 μm bulk silicon

Boit, Christian ; Lohrke, Heiko ; Scholz, Philipp ; Beyreuther, Anne ; Kerst, Uwe ; Iwaki, Y. (2015)

This paper explains why only optical techniques will be able to provide debug and diagnosis of bulk silicon FinFET technologies. In order to apply optical techniques through a convenient thickness of silicon on the one hand, light is limited to NIR to minimize absorption. To match resolution requirements on the other hand, it becomes mandatory to use shorter wavelengths. Two key issues have to ...

Nanocrystalline silicon and silicon oxide contact layers for silicon heterojunction solar cells

Mazzarella, Luana (2017)

Crystalline-silicon solar cells are presently the main technology to supply the rapidly growing market for competitive photovoltaic electricity. To drive conversion efficiency of such cells further up, silicon heterojunction (SHJ) solar cells are promising. This thesis addresses strategies to improve the efficiency of such cells by the integration of nanocrystalline silicon (nc-Si:H) and nanoc...

Differentieller Mikrowellen-Leistungsoszillator für die Realisierung ultrakompakter Plasmaquellen in Matrixanordnung

Bansleben, Christian (2017)

In der vorliegenden Arbeit werden neue Ansätze zur Realisierung besonders platzsparender und effizienter Mikrowellengeneratoren im Leistungsbereich bis 50 W auf Basis von Leistungsoszillatoren demonstriert. Mit einer substanziellen Einsparung an Schaltungsfläche gegenüber den konventionellen Generatorkonzepten lassen sich bislang unerreichbare Anwendungsfelder erschließen. Einen besonders innov...

Transient Liquid Phase Soldering als Verbindungstechnik leistungselektronischer Halbleiter für Hochtemperaturanwendungen

Ehrhardt, Christian (2017)

In zahlreichen Anwendungsfeldern der Elektronik besteht der Wunsch oder die Notwendigkeit die Einsatztemperatur des elektronischen Moduls zu erhöhen, wie beispielsweise in der Leistungselektronik, um aufwändige Kühlsysteme einzusparen. Dazu bedarf es Bauteile, Substratmaterialien und Verbindungstechniken, welche zuverlässig bei diesen erhöhten Betriebstemperaturen sind. Die derzeit am häufigste...