Aktuelle Projekte

High-Resolution, Efficient Incremental Sigma-Delta Modulators

M. Mokhtar: Sigma-Delta (ΣΔ) ADCs are suitable for various applications, due to its oversampling and noise-shaping behavior, thus high resolutions can be achieved independent on the matching accuracy of the analog components. For multiplexed applications, where an ADC is used to digitize the input coming from multi-channels ... [more]

Transimpedance Amplifiers for Life and Material Science

M. Häberle: Many life and material science applications like Scanning Ion Conductance Microscopy (SICM) and Electrically Detected Magnetic Resonance put demanding constraints on readout electronics. In a SICM experiment a pipette is used to map the surface of soft biological samples. An EDMR experiment is used to derive the efficency of solar cell materials ... [more]

Electrochemical Sensor Integrated Circuits

M. Rajabzadeh: The electrochemical detection of target molecules, the analysis of bioimpedances and the realization in microsystems have received an increasing attention lately. Chronoamperometry (CA), cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) are the most common methods that are used for the analysis of endogenous and exogenous molecules or electrical properties of tissues ... [more]

High-Resolution Incremental Sigma Delta ADCs for Biomedical Signals

P. Vogelmann:  In the past few years, an increased interest in biomedical implants like neural recorders is noticeable as measured by the number of publications. These devices are integrated circuits (ICs) that comprise more and more functionality which increases their versatility and importance in medical research...  [more]

Data Compression Techniques for Brain Machine Interfaces

M. Pagin: In last decades development of Brain Machine Interfaces (BMIs) became more and more widespread. The technology allows recording of electrical activity in the brain, to further understand its complex dynamics. But not just for pure research, BMIs offer a bridge between thoughts and actions, robotic prosthesis activated by “thoughts” have already been tested on human patients ... [ more ]

Ultra-low Power, Wide Bandwidth Continuous-time Sigma Delta Analog to Digital Converter Design

A. Abdelaal: Continues time delta sigma modulators (CTDS) have recently become the key device for broadband wireless and wireline communication.  Due to there built in anti-aliasing filter and the ability to have relaxed sampling requirements the CTDS modulators are preferred over there discrete time counterparts ... [more]

Physical Unclonable Functions (PUFs)

A. Herkle, H. Mandry: Im Lauf des letzten Jahrzehnts haben Physikalisch Unklonbare Funktionen (PUFs) sich als fester Bestandteil auf dem Gebiet der Kryptographie und der Authentifizierung etabliert. Diese basieren auf physikalischen Abweichungen, die sich aufgrund beschränkter Präzision während des Herstellungsprozess ergeben. PUFs bieten daher hervorragende Eigenschaften für die genannten Forschungsfelder, inbesondere Einzigartigkeit, Unvorhersagbarkeit und Unklonbarkeit ... [ mehr]

Blocker and Jitter-Tolerant Continuous-Time Sigma-Delta ADCs

J. Chi: Continuous-time (CT) Sigma-Delta ADCs are a promising candidate for high-speed receiver applications, such as software-defined radio (SDR), due to its inherent anti-aliasing and signal filtering, potential lower power consumption because of less stringent requirements on Op-Amps, and easy reconfigurability ... [ more]

Online Tool for Rapid Continuous-Time ΣΔ Modulator Design

J. Wagner: ΣΔ A/D converters are the state of the art for many different applications. The basis for this type of A/D converter is the ΣΔ modulator. For a long time, discrete-time (DT) ΣΔ modulators dominated as their design techniques could easily be adopted to ensured high performance... [ more]

High resolution SAR ADC employing Sigma Delta DACs

Y. Luo: ADCs are essential building blocks for almost all electronic systems, they represent the key element that allows the digital representation of any electrical signal located in the analog domain, and hence these by-nature analog signals could be processed by the latest sophisticated digital processing units only after well A/D conversion in the ADCs ... [ more]

CMOS Circuits for Multi-Channel, Bidirectional Neural Interfaces

M. Haas, M. Pagin, S. Reich, M. Sporer, P. Vogelmann: Bidirectional, neural interfaces are a tool which is widely used in the study of the complex interconnections between neurons within the brain. To understand the activity of neural cells, nervous tissue is first stimulated with a current or voltage signal and afterwards its electrical activity is observed ... [more]

Adaptierbare Architekturen für Mikrocontroller-Bausteine

E. Schubert: Moderne, verteilte Regelsysteme (wie z.B. Cyber-Physical Systems) benötigen eine schnelle Adaptierbarkeit der mikroelektronischen Bauteile. Mit Fokus auf Methoden zur Implementierung von unterschiedlichen analogen und digitalen I/O Standards in frei verfügbaren Bauteilen wie FPGAs, untersuchen wir die optimale Realisierung der gesamten Signalstrecke einschließlich Signalkonditionierung für Sensoren, Signalverarbeitung und -visualisierung, sowie Leistungsansteuerungen für Aktoren ... [mehr]

Circuit design for a subretinal stimulator

S. Moll, H. Schütz, R. Steinhoff: In this project we develop CMOS circuits optimized for the usage in medical implants. The emphasis is on low-power, optimized silicon area, and optimized performance ... [more]

Feld-Programmierbare Analoge Bausteine (FPAAs)

J. Becker: Es existieren viele Versuche, die aus der digitalen Domäne bekannten rapid-prototyping Techniken auf analoge Schaltungen anzuwenden. Das Ziel unserer Arbeit ist einen feld-programmierbaren analogen Baustein zu entwickeln, der für die rekonfigurierbare Implementierung von zeitkontinuierlichen analogen Hochfrequenzfiltern auf integrierten Schaltungen geeignet ist ... [mehr]