Paul, Steffen
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Paul, Steffen
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Paul, Steffen
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Item-typ:Veröffentlichung, Rapid Digital Architecture Design of Computationally Complex Algorithms(2019-02-07); ; ; Traditional digital design techniques hardly keep up with the rising abundance of programmable circuitry found on recent Field-Programmable Gate Arrays. Therefore, the novel Rapid Data Type-Agnostic Digital Design Methodology (RDAM) elevates the design perspective of digital design engineers away from the register-transfer level to the algorithmic level. It is founded on the capabilities of High-Level Synthesis tools. By consequently working with data type-agnostic source codes, the RDAM brings significant simplifications to the fixed-point conversion of algorithms and the design of complex-valued architectures. Signal processing applications from the field of Compressed Sensing illustrate the efficacy of the RDAM in the context of multi-user wireless communications. For instance, a complex-valued digital architecture of Orthogonal Matching Pursuit with rank-1 updating has successfully been implemented and tested.Dissertation333 406 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Alterungsanalyse komplexer analoger integrierter Schaltungen aus Systemsicht(2019-05-22); ; ; The design of analog circuits ranges from the specifications on system level, the selection of a suitable circuit topology up to the choice of the concrete physical dimensions of components like transistors. The individual steps are performed within computer-aided design environments. These environments are based on a database made available by the semiconductor manufacturers containing process parameters and influences on the components. In particular, the influences to be considered in the design have increased in recent years due to the continuous reduction of the producible structural sizes. Thus, it must be possible to analyze the deviations due to process, temperature, time degradation and, for special applications, radiation influences during the design phase. Conventional approaches regard these additional effects as standing next to the actual design process. As a result, the latter is no longer consistent and it is much more complex to consider different circuits and effects on different abstraction levels within the design flow. The focus of this work lies on the development of a consistent consideration of process, voltage, temperature, aging and radiation influences (PVTAR) during the entire design process of analog circuits to the initial measurement of manufactured circuits. To achieve this goal, a transistor model was extended by the influences to be considered. Thereby, the analysis of the additional effects is seamlessly integrated into conventional design processes and methods. In addition, the possibility of a structured analog design is evaluated. This approach allows the estimation of PVTAR influences on dedicated analog function blocks and their propagation on circuit level. Thus, the enormous simulation effort associated with aging analyses can be reduced. The design and manufacture of circuits is always followed by the measurement of the core properties of these circuits. In the context of this work a method was developed which makes it possible to use all insights from the design of a circuit for the improvement of the measuring results. In addition, the internal parameter sets of individual components can be inferred from the terminal behavior of circuits and systems. Finally, the results of the measurement method can be used for the automated calculation of circuit reliability parameters.Dissertation409 764 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Maskierte Erfassung und inpaintingbasierte Wiederherstellung von großen Datenvolumen in Systemen mit eingeschränkter Berechnungskapazität(2018-06-15); ; ; The exponential growth of the generated data volume, due to the increasing number of participants in data traffic as well as networking, confronts many application-specific systems worldwide with new and future challenges. Based on the large amount, the high speed and the large variety of data, individual problems arise in the acquisition, transmission and processing. Managing such data volumes with traditional data processing approaches is often infeasible to resource-constrained applications, because of limitations of the computational capacity. This thesis focusses on solutions for the processing of high data volumes in systems with limited computational capacity. The key concept is based on a methodology for the asymmetric distribution of computational effort through the use of algorithmic tools in the field of multidimensional digital data restoration (inpainting). The combination of masking for data reduction and inpainting for data recovery opens up the potential to innovative solutions for currently unresolved problems and to improve existing approaches. From the field of medicine, space technology as well as imaging recording media, problems to evaluate the developed solutions of the innovative methodology in this thesis. Furthermore, the approaches are compared to different reference methods. Both, the degree of data reduction and the reconstruction quality of the inpainting-based recovery, serve as figures of merit to evaluate the developed approaches within simulated examinations of the application-specific scenarios.Dissertation346 226 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Entwurf und Implementierung von digitalen Fehlerkorrekturverfahren für Mixed-Signal-Frontend-Schaltungen(2019-06-19); ; ; Various non-ideal effects as well as environmental influences can affect the transfer characteristics of analog microelectronic circuits. In order to reduce the consequences of these effects, additional circuitry or different compensation techniques are usually used. Unfortunately, most of these methods have several drawbacks. They significantly increase the design time and costs of the circuit and lead to a higher consumption of energy and chip area. For this reason, an innovative method of error detection and correction is developed in this work, which is based on digital calibration and particularly well suited for the application in mixed-signal systems. With this approach, the error correction is no longer performed by complex, analog compensation techniques but by additional digital signal processing. First of all, a suitable test signal is fed into the analog circuit to make different errors visible. Subsequently, the test signal is evaluated in the digital part of the system by adaptive filters and appropriate algorithms to determine the kind and size of present errors. This information is used afterwards to eliminate any errors from the test and the useful signal. With this procedure, the disadvantages of analog compensation methods are removed with only a low overhead on digital circuitry. Furthermore, it is not only possible to correct static as well as time-variant errors but the circuit also gains the ability to monitor itself. As a result, the whole system becomes more reliable and robust. In order to demonstrate the performance of the introduced approach, it is used to correct different gain- and offset-errors in a generic sensor interface circuit. For this purpose, a simulation-based and a practical verification are performed to analyze various application and error cases. While a simulation model of the interface-circuit is used for the first task, a printed circuit board with electronic components is used for the second one. With both forms of verification, the successful application of the developed method can be shown.Dissertation354 161 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Low power design of a versatile analog mixed Signal sensor module(2018-03-02); ; ; The development of space electronics especially for launcher such as Ariane 6 has to fulfill space standards and space requirements provided by the space industries. The standards of the European Cooperation for Space Standardization (ECSS) are used extensively to ensure a development process that meets the space requirements. This standard covers space project management, space product assurance and space engineering. The ECSS is a cooperative effort of the European Space Agency, national Space Agencies and European Industry Associations for the purpose of developing and maintaining common standards. The work presented in this dissertation was carried out to fill the gap of developing wireless sensor network for Ariane launchers. The development process follows the space requirements that demand the sensor node to survive the environmental condition inside the launcher. This makes the work uniquely compared to commercial wireless sensor network development. The versatile analog mixed signal module proposed in this work consists of infrared transmitter, VLC receiver, power management, data processing with digital/analog sensor interface unit and solar cell as energy harvester. The sensor module is used to build wireless sensor network inside the Vehicle Equipment Bay (VEB) of Ariane 5.Dissertation542 204