Jahr Name
2021

Development and Construction of a Parameterizable Condition Classification System for Electromagnetic Proportional Valves using Neuronal Networks (Nemoh / Neuromorphe Hardware für Anwendungen mit KI)

D. Rossbach, M. Rüb, M. Kuderer, Y. Manoli

MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany

Kurzfassung einblenden

In this paper the development of a compact condition classification system for electromagnetic proportional valves is shown. It allows the generation of training data as well as a fast testing and comparison of different trained neuronal networks. By using quantization and pruning, a neuronal network with drastically reduced complexity has been created, so an FPGA implementation was possible. The developed and implemented network shows a very high classification rate and can distinguish 12 different error reasons of the valves. The system requires the measurement of the supply current only, which allows a simple integration of such a false detection circuitry into existing systems. In the future, the system can be modified easily, e.g. to use and test a hardware based AI accelerator instead of the FPGA implementation.

 

Link zum Paper

2021

Entwurf einer CMOS-integrierten, rauscharmen Stromausleseschaltung mit niedriger Eingangskapazität für die medizinische Diagnostik via biologischer Nanoporen

M. Amayreh, S. Elsaegh, N. Butz, M. Kuderer, Y. Manoli

MikroSystemTechnik Kongress 2021, 08.11.2021 - 10.11.2021, Stuttgart-Ludwigsburg, Deutschland


Link zum Paper

2021

Delta-Kodierung zur Reduzierung der Datenrate in neuronalen Sonden mit In-Situ Delta-Sigma Analog-Digital-Wandler Front-End

D. Wendler, J. Koerber, D. De Dorigo, R. Willaredt, Y. Manoli

MikroSystemTechnik Kongress, 08.-10. November 2021, Ludwigsburg

2021

A 0.00378mm2 Scalable Neural Recording Front-End for Fully Immersible Neural Probes Based on a Two-Step Incremental Delta-Sigma Converter with Extended Counting and Hardware Reuse

D. Wendler, D. De Dorigo, M. Amayreh, A. Bleitner, M. Marx, Y. Manoli

IEEE International Solid- State Circuits Conference (ISSCC), 13.-22. Februar 2021, San Francisco, CA, USA

2021

Active Charge Balancer With Adaptive 3.3 V to 38 V Supply Compliance for Neural Stimulators

N. Butz, U. Kalita, Y. Manoli

IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, issue 10, Electronic ISSN: 1558-0806, DOI: 10.1109/TCSI.2021.3101550

2021

Vapor HF Etching Based Surface Micromachining Process for Fabricating a Micromechanical Sterilization Cycle Counter

R. Vora, I. Spies, D. Hoffmann, H. Trautner, C. Blattert, A. Dehé

MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany

Kurzfassung einblenden

It is mandatory for manufacturers of reusable medical devices to specify the maximum of allowed sterilization cycles. This work focuses on the fabrication of an autonomous sterilization cycle counter in MEMS technology. Surface microm-achining is applied utilizing vapor HF (vHF) etching and subsequent polymer anti-stiction coating as an efficient tech-nique to remove sacrificial buried oxide layers and to release micro structure without stiction. The vHF etching process has been optimized and reaches etch rates of 900 nm/min for the buried oxide with a uniformity of more than 95 % across a 100 mm wafer. Based on this process a compatible design with perforated structures is implemented. Finally, devices of the sterilization cycle counter are successfully tested by a simulated sterilization cycle temperature test.

 

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2021

Optimization of a High-g Acceleration Sensor for Crash-test Application

A. Srivastava, J. Rockstroh, A. Dehé

MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany

Kurzfassung einblenden

Piezoresistive accelerometers are a popular and widely used method of acceleration sensing due to their simplicity in fabrication, packaging and inherent ruggedness. These devices usually have simpler electronics for example compared to capacitive sensors. There are products available without ASICs as well. [1] This work takes an existing high-g piezoresistive accelerometer as a reference sensor and works on optimizing this design. The work delves into different design and optimization techniques to deliver novel high-performance piezoresistive acceleration sensor prototypes. These techniques exploit the device physics and mechanics to point towards the new designs. The sensor is designed and optimized to have higher bandwidth. The adaptation of SOI wafers instead of currently used epitaxial wafers, results in smaller chip size, enabling more chips/wafer and reducing the sensor cost. Extra emphasis has been laid to maintain high sensitivity, for specified doping of the piezoresistors, while still not compromising much on the resonance frequency. Finite element analysis with ANSYS Workbench offers insights into the device performance and helps in the determination of some key sensor parameters for the new designs. It also helps to establish trends and this provides an idea for the successive models. After several iterations and incorporating different optimization techniques, new models are achieved.

 

Link to publication

2021

Development of a hybrid microsystem for acquisition of sterilization cycles

D. Hoffmann, H. Trautner, S. Spieth, S. Herrlich, K. Pagel, A. Dehé

MikroSystemTechnik Congress 2021, 8-10 Nov. 2021, Stuttgart-Ludwigsburg, Germany

Kurzfassung einblenden

In this paper we present a hybrid microsystem for acquisition and counting of sterilisation cycles. The device includes a micromechanical counter mechanism and a thermal actuator based on a shape memory alloy (SMA). The device is designed to count 100 sterilization cycles. The basic functionality is investigated on a hotplate using a thermal temperature profile with a peak temperature of 135 deg C. In this manner, counting of thermal cycles is demonstrated.

 

Link to publication

2021

A Non-Linear Lumped Model for the Electro-Mechanical Coupling in Capacitive MEMS Microphones

S. Anzinger, C. Bretthauer, D. Tumpold, A. Dehé

Journal of Microelectromechanical Systems 30 (3), 360-368, doi: 10.1109/JMEMS.2021.3065129

Kurzfassung einblenden

This work provides an analytical non-linear model for the capacitive transduction in MEMS transducers with perforated counter-electrodes, especially applicable to capacitive MEMS microphones. Starting from an electrostatic description of a perforated unit cell of the transducer, analytical formulations of the variable capacitance and electrostatic forces are derived, accounting for the deflection profile of a clamped circular plate. A lumped implementation into conventional circuit simulations tools is enabled via behavioral modeling based on hardware description languages, such as Verilog-A. Therefore, the analytical model is approximated via Taylor series expansions, allowing for a stable and non-linear behavioral implementation. The resulting model finally enables both a small- and large-signal analysis of capacitive MEMS microphones, precisely accounting for non-linearities in the capacitive transduction. This allows to simulate the harmonic distortion of the microphone's output signal and to account for electrostatic spring-softening in simulations of its bias voltage dependent sensitivity.

 

Link to publication

2021

Development of A Z-Axis Out of Plane MEMS Accelerometer

A. Basavanna, M. Dienger, J. Rockstroh, S. Keller, A. Dehé

2021 IEEE 34th International Conference on Micro Electro Mechanical Systems (MEMS), 25-29 Jan. 2021, Gainesville, USA

Kurzfassung einblenden

MEMS are minute electro-mechanical systems that are able to sense small changes in the environment and are responsible for a large chunk of the sensor market. MEMS inertial sensors such as gyroscopes and accelerometers have helped in realizing new products across a multitude of fields. One of the next aspects of MEMS Inertial sensors is the Internet of Things [IOT] and Industry 4.0. Hence, the following work depicts a sensor element design for vibration detection in Out Of Plane [OOP] axis (z-axis) proposed for closed loop control considering a system bandwidth of 20 kHz. The current work highlights the concept of an "anti-phase" design type sensor element developed considering either top or bottom electrodes allowing for the possibility of closed loop control. The translational motion of the sensor element along with the larger mass elements provides higher performance and lower noise. The analysis indicates a sensor element with size 1mm*1mm showcasing a specific open loop sensor sensitivity per area of 1.12 nF/g/m 2 with resonance frequency of 10.5 kHz and can be considered as a viable alternative to see-saw design type.

 

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2021

Printed low-voltage crossbar-puf for identification

A. Scholz, L. Zimmermann, A. Sikora, M. B. Tahoori, J. Aghassi-Hagmann

2021 IEEE International Flexible Electronics Technology Conference (IFETC), pp. 62-66, 08. - 11. August 2021


Link to publication

2021

Classification of cow behaviour for sensor assisted alpine milk production

T. Peikenkamp, D. Plaia, T. Hehn, D. Gaida, M. Hoenen, A. Ule

72nd Annual Meeting of the European Federation of Animal Science (EAAP), p. 387, 30.08. - 03.09.2021, Davos, Schweiz

2021

SESAM sensor technology for milk producers

L. Dale, Z. Vassilev, J. Bieger, K. Droessler, F. J. Auer, M. Erhart, T. Hehn, T. Peikenkamp, M. Klopcic, A. Werner, M. Hoenen

72nd Annual Meeting of the European Federation of Animal Science (EAAP), p. 386, 30.08. - 03.09.2021, Davos, Schweiz

2021

Telemetrische Verformungsmessung mit einem CMOS-integrierten Sensorchip

T. Hehn, H. Rietsche

Sensor und Test 2021, 04. - 06. Mai 2021, Online

2021

Joystick mit mehrachsigem Miniaturkraftsensor

T. Hehn

Innovationstag des Bundesministeriums für Wirtschaft und Energie (BMWi), 17.06.2021, Online

2021

Multi-Axis Micro Force Sensor Based on a CMOS Integrated Chip

B. Folkmer, T. Hehn, M. Köhler, A. Willmann, D. Landler-Gärtner, A. Dehé

Mikrosystemtechnik-Kongress 2021, 9. - 10. November 2021, Ludwigsburg

2021

A performance-based tabular approach for joint systematic improvent of risk control and resilience applied to telecommunication grid, gas network, and ultrasound localization system (MERLIN)

I.Häring, M. Fehling-Kaschek, N. Miller, K. Faist, S. Ganter, K. Srivastava, A.K. Jain, G. Fischer, J. Finger, A. Stolz, T. Leismann, S. Hiermaier, M. Carli, F. Battisti, R. Makri, G. Celozzi, M. Belesioti, E. Sfakianakis, E. Agrafioti, A. Chalkidou, G. Papadakis, C. Fuggini, F. Bolletta, A. Neri, G. Giunta, H. Scheithauer, F. Höflinger, D.J. Schott, C. Schindelhauer, S. Köhler, I. Linkov

Springer nature, Environment Systems and Decisions 41, 286–329 (2021)

Kurzfassung einblenden

Organizational and technical approaches have proven successful in increasing the performance and preventing risks at socio-technical systems at all scales. Nevertheless, damaging events are often unavoidable due to a wide and dynamic threat landscape and enabled by the increasing complexity of modern systems. For overall performance and risk control at the system level, resilience can be a versatile option, in particular for reducing resources needed for system development, maintenance, reuse, or disposal. This paper presents a framework for a resilience assessment and management process that builds on existing risk management practice before, during, and after potential and real events. It leverages tabular and matrix correlation methods similar as standardized in the field or risk analysis to fulfill the step-wise resilience assessment and management for critical functions of complex systems. We present data needs for the method implementation and output generation, in particular regarding the assessment of threats and the effects of counter measures. Also included is a discussion of how the results contribute to the advancement of functional risk control and resilience enhancement at system level as well as related practical implications for its efficient implementation. The approach is applied in the domains telecommunication, gas networks, and indoor localization systems. Results and implications are further discussed.

 

Link to publication

2021

Characterization of hermetically sealed metallic feedthroughs through injection-molded epoxy-molding compounds

Mehmet Haybat, Thomas Guenther, Romit Kulkarni, Serhat Sahakalkan, Tobias Grözinger, Thilo Rothermel, Sascha Weser and André Zimmermann

Applied Mechanics, MPDI

Kurzfassung einblenden

Electronic devices and the associated sensors are exposed to increasing mechanical, ther- 12 mal and chemical stress in modern applications. In many areas of application, the electronics are 13 completely encapsulated with thermosets in a single process step using the injection molding tech- 14 nology, especially with epoxy molding compounds (EMC). The implementation of the connection 15 of complete systems for electrical access through a thermoset encapsulation is of particular im- 16 portance. In practice, metal pin contacts are used for this purpose, which are encapsulated together 17 with the complete system in a single injection molding process step. However, this procedure con- 18 tains also challenges because the interface between the metallic pins and the plastic represents a 19 weak point for reliability. In order to investigate the reliability of the interface, metallic pin contacts 20 made of copper-nickel-tin alloy (CuNiSn) and bronze (CuSn6) are encapsulated with standard EMC 21 materials within the scope of this study. The metal surfaces made of CuNiSn are further coated with 22 silver (Ag) and tin (Sn). An injection molding tool to produce test specimens is designed and man- 23 ufactured according to the design rules of EMC processing. The reliability of the metal-plastic in- 24 terfaces are investigated by means of shear and leak tests. The results of the investigations show 25 that the reliability of the metal-plastic joints can be increased by using different material combina- 26 tions.

2021

Breitbandiger, adaptierbarer MEMS-Beschleunigungssensor für Industrie 4.0- Anwendungen (BABSI4.0)

M. Dienger, C. Grandauer

Schlussbericht zu IGF-Vorhaben Nr. 19896 N

Kurzfassung einblenden

Im Rahmen dieses Forschungsvorhabens soll ein in Mikrotechnologie hergestellter multiaxialer,
hoch miniaturisierter Beschleunigungssensor mit integrierter Ausleseelektronik zur breitbandigen
und hochauflösenden Vibrationsmessung (u.a. für Zustandsüberwachung) entlang aller drei
Raumrichtungen realisiert werden.

Link zum Schlussbericht

2021

Rapid wet-chemical oxidative activation of graphite felt electrodes for vanadium redox flow batteries

B. Shanahan, K. Seteiz, P. A. Heizmann, S. Koch, J. Büttner, S. Ouardi, S. Vierrath, A. Fischer and M. Breitwieser

RSC Advances 11 (51) 32095 - 32105, doi: 10.1039/D1RA05808H