@phdthesis{Killat, author = {Killat, Dirk}, title = {St{\"o}rgr{\"o}ßeneliminierende Sensorsignalverarbeitung}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {3-18-326509-5}, pages = {XV, 136}, language = {de} } @inproceedings{PashminehKillat, author = {Pashmineh, Sara and Killat, Dirk}, title = {A high-voltage driver based on stacked low-voltage transistors with minimized on-resistance for a buck converter in 65 nm CMOS}, series = {2016 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 15-18 May 2016}, booktitle = {2016 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), 15-18 May 2016}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-4673-8721-7}, doi = {10.1109/CCECE.2016.7726692}, pages = {1 -- 5}, abstract = {This paper presents a high-voltage (HV) driver for switching a buck converter. The circuit is based on 3-stacked CMOS using gate control circuits to drive maximum current which indicates minimized on-resistance of the HV-driver thus achieving faster switching. The circuit is designed and fabricated using 65 nm CMOS TSMC process technology with a nominal voltage of 2.5 V and with a supply voltage of 5.5 V. Since the design is based on stacked CMOS transistors, the circuit is technology-independent. The initial on-resistances of the driver pull-up and the pull-down paths have an improvement of 75\% and 36\% respectively. Due to a buck converter switched by the designed HV-driver, output voltages in the range of 0.45 V to 2.45 V can be achieved from different high supply voltages in the range of 3.5 V to 5.5 V. The circuit occupies an area of 0.187 mm2.}, language = {en} } @inproceedings{PashminehKillatBramburger, author = {Pashmineh, Sara and Killat, Dirk and Bramburger, Stefan}, title = {Design of a high-voltage rail-to-rail error amplifier based on standard CMOS used in an LDO}, series = {2016 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE, 15-18 May 2016}, booktitle = {2016 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE, 15-18 May 2016}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-4673-8721-7}, doi = {10.1109/CCECE.2016.7726693}, pages = {1 -- 5}, abstract = {This paper presents the design of a high-voltage (HV) rail-to-rail error amplifier. This circuit controls the output signal of a low drop-out voltage regulator (LDO) according to the reference voltages and based on stacked standard transistors. The circuit is designed using 65 nm CMOS process technology with a nominal voltage of 2.5 V and is optimized for arbitrary values of supply voltage up to 5.0 V. The error amplifier consists of 3 stages and 2 feedback loops. The stages are internally connected rail-to-rail to achieve high GBW and DC accuracy. The simulation and measurement results for the designed HV-error amplifier show that the output signal of the LDO tracks the reference voltages. The circuit design is technology-independent and compatible with scaled CMOS.}, language = {en} } @misc{BramburgerPitonakKillat, author = {Bramburger, Stefan and Pitonak, Pavol and Killat, Dirk}, title = {A unary coded current steering DAC with sequential stepping of the thermometer coded register in 1 and 2 LSB steps}, series = {41st International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 21-25 May 2018, Opatija, Croatia}, journal = {41st International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 21-25 May 2018, Opatija, Croatia}, publisher = {IEEE}, address = {Piscataway}, isbn = {978-953-233-095-3}, doi = {10.23919/MIPRO.2018.8400017}, pages = {89 -- 92}, abstract = {This paper presents an 8-bit current steering DAC that uses unary current sources and a thermometer coded register. The thermometer coded register is controlled by sequentially stepping one or two steps up or down dependent on the control input. The enhanced step size mitigates the slew-rate limitation if the DAC is used in a delta-encoded tracking ADC. The sequential switching of thermometer coded DAC register does not require a binary to thermometer decoder and reduces complexity of error compensation.}, language = {en} } @misc{BramburgerZinkeKillat, author = {Bramburger, Stefan and Zinke, Benny and Killat, Dirk}, title = {Interpolation algorithm for asynchronous ADC-data}, series = {Advances in radio science}, volume = {15}, journal = {Advances in radio science}, issn = {1684-9973}, doi = {10.5194/ars-15-163-2017}, pages = {163 -- 168}, abstract = {This paper presents a modified interpolation algo- rithm for signals with variable data rate from asynchronous ADCs. The Adaptive weights Conjugate gradient Toeplitz matrix (ACT) algorithm is extended to operate with a contin- uous data stream. An additional preprocessing of data with constant and linear sections and a weighted overlap of step- by-step into spectral domain transformed signals improve the reconstruction of the asycnhronous ADC signal. The interpo- lation method can be used if asynchronous ADC data is fed into synchronous digital signal processing.}, language = {en} } @misc{PitonakKillatZhu, author = {Pitonak, Pavol and Killat, Dirk and Zhu, Haoran}, title = {Einfluss der Taktratensteuerung auf die Genauigkeit asynchroner ADCs}, series = {ANALOG 2018, Beitr{\"a}ge der 16. GMM/ITG-Fachtagung, 13.-14. September 2018 in M{\"u}nchen}, journal = {ANALOG 2018, Beitr{\"a}ge der 16. GMM/ITG-Fachtagung, 13.-14. September 2018 in M{\"u}nchen}, publisher = {VDE Verlag}, address = {Berlin}, isbn = {978-3-8007-4754-2}, pages = {62 -- 63}, abstract = {Es wurde die Genauigkeit von zwei asynchronen ADCs untersucht; einem Nyquist-Rate Tracking ADC und einem 1-Bit Delta-Sigma-ADC, bei denen die Taktfrequenz selbst{\"a}ndig geregelt wird. Speziell wurde die Genauigkeit der ADCs f{\"u}r realistische Signale aus dem Bereich der Automobilindustrie untersucht. Die Analyse erfolgte mithilfe von MATLAB und Simulink. Die Ergebnisse der transienten Simulationen werden dargestellt und bewertet.}, language = {de} } @misc{MendoncaRadeckerKillatetal., author = {Mendon{\c{c}}a, Lucas Sangoi and Radecker, Matthias and Killat, Dirk and Bisogno, F{\´a}bio Ecke}, title = {Ultrasound Piezo-Harvester Energy Transfer Systems for Machine Tool Sensor-Charger Applications}, series = {PCIM Europe : International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, 07.- 09. May 2019}, journal = {PCIM Europe : International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, 07.- 09. May 2019}, publisher = {VDE VERLAG}, address = {Berlin}, isbn = {978-3-8007-4938-6}, pages = {4}, abstract = {Ultrasound energy transfer systems can be an alternative for sensor-chargers aiming battery replacement avoidance and can be used in machine tool applications. An ultrasound input source can be used to send an acoustic signal through a machine. The signal is received by an ultrasound receiver based on piezoelectric component and should be converted into an electrical signal to supply or charge the sensor. Notwithstanding, for rotating machines, an air gap must be considered between the input source and the machine tool part. This paper deals with the acoustic-electrical energy transfer considering the changes in the propagation media of the ultrasound. Theoretical results are verified by means of an experimental setup.}, language = {en} } @misc{MartinsRadeckerFracaroetal., author = {Martins, Leandro Tom{\´e} and Radecker, Matthias and Fracaro, Marcelo Henrique and Mendon{\c{c}}a, Lucas Sangoi and Bisogno, F{\´a}bio Ecke and Killat, Dirk}, title = {Modeling and Design of a Linear-Assisted Zeta Conveter}, series = {21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)}, journal = {21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)}, publisher = {VDE}, address = {Berlin}, doi = {10.23919/EPE.2019.8914764}, pages = {10}, abstract = {Linear-assisted switching (PWM) converters have advantages over single switching topologies, mainly because of the reduction or elimination of bulky output capacitors and ultra-fast dynamical response. In this paper, a linear-assisted zeta converter is presented. The linear regulator circuit is composed by three bipolar transistors and an operational amplifier, which drives the transistor based on the error between the output voltage and its reference. The modeling of the whole circuit is presented, as well as a design example. The modeling of the zeta converter is similar to the conventional topology modeling, except the fact that the linear regulator current is considered as an extra state that substitutes the state regarding the output capacitor voltage. The zeta converter can be designed independently of the linear regulator circuit and simulations are used to validate the static operation of the overall topology. Experimental results confirm in practice the ripple compensation of the main zeta converter, where extra current is provided by the main converter, in order to drive the linear regulator that is responsible for the ripple compensation.}, language = {en} } @misc{MendoncaRadeckerKillatetal., author = {Mendonca, Lucas Sangoi and Radecker, Matthias and Killat, Dirk and Bisogno, F{\´a}bio Ecke}, title = {Normalized State-Space Models of Resonant Rectifiers}, series = {2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany}, journal = {2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany}, isbn = {978-3-948571-00-9}, pages = {4}, abstract = {In AC-DC power conversion, the input source features: time dependence and phase angle, combined with the complexity of resonant circuits, lead to solutions that are difficult to obtain. In this sense, an analysis and design methodology of resonant rectifiers is proposed, in which, iterative numerical solutions are replaced by analytic solutions with the help of computer algebra systems. The method allows obtaining the AC-to-DC transfer function, the quality factor, the phase angle and the resonance frequency. A case study for the Class-E zero-derivative voltage switched resonant rectifier is performed. Experimental results are shown in order to validate the theoretical approach.}, language = {en} } @misc{UlmannKillat, author = {Ulmann, Bernd and Killat, Dirk}, title = {Solving systems of linear equations on analog computers}, series = {2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany}, journal = {2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany}, isbn = {978-3-948571-00-9}, pages = {4}, abstract = {Solving systems of linear equations is a central task not only in artificial intelligence. This article outlines a technique making it possible to employ analog computers to the solution of such equations. Using iterative techniques it is even possible to setup a hybrid computer, i. e. a combination of a classic digital and an analog computer, where the analog portion can be used as a co-processor. If the solutions obtained by pure analog computing are not of the required accuracy, it is possible to use these as initial vectors for a classic iterative algorithm running on the digital computer to further enhance the precision of the solution obtained.}, language = {en} } @misc{MendoncaMartinsRadeckeretal., author = {Mendonca, Lucas Sangoi and Martins, Leandro Tom{\´e} and Radecker, Matthias and Bisogno, F{\´a}bio Ecke and Killat, Dirk}, title = {Normalized Modeling of Piezoelectric Energy Harvester Based on Equivalence Transformation and Unit-Less Parameters}, series = {Journal of Microelectromechanical Systems}, volume = {28}, journal = {Journal of Microelectromechanical Systems}, number = {4}, issn = {1941-0158}, doi = {10.1109/JMEMS.2019.2921649}, pages = {666 -- 677}, abstract = {Micro-electromechanical systems are ubiquitous in several energy harvesting solutions and can be used in applications such as bio-implantable devices and wireless micro-sensors. Piezoelectricity is an interesting key to perform the interface between environmental extracted energy and the power delivered to the load due to the use of mechanical vibration and resonance features. However, it is necessary for a detailed analysis in order to obtain an accurate understanding of the system. In this regard, some works deal with the normalization procedures to analyze the piezoelectric component behavior based on the mechanical resonance frequency. In order to enhance the system modeling, the electromechanical resonance frequency must also be analyzed. This paper deals with an approach to model the piezoelectric component that allows analyzing several unitless parameters that are critical to improve the performance of the system. In addition, a state-space model for the piezo-harvester based on the Class-E resonant rectifier is presented. Some experimental results are shown to validate the theoretical approach. [2019-0082].}, language = {en} } @misc{HongKillatXu, author = {Hong, Zhiliang and Killat, Dirk and Xu, Weiwei}, title = {Switching converter and method for controlling a switching converter}, language = {en} } @misc{BramburgerKillat, author = {Bramburger, Stefan and Killat, Dirk}, title = {10-bit tracking ADC with a multi-bit quantizer, variable step size and segmented current-steering DAC}, series = {Advances in Radio Science}, volume = {Vol. 17}, journal = {Advances in Radio Science}, issn = {1684-9973}, doi = {10.5194/ars-17-161-2019}, pages = {161 -- 167}, abstract = {This paper presents a 10-bit tracking ADC using a multi-bit quantiser and a segmented current-steering DAC. The quantiser allows a dynamical adjustment of the step size dependent on the input signal waveform. This mitigates the limited slew rate of delta encoded ADCs. Energy consumption induced by 1 LSB ripple is removed by the quantiser. The segmented current-steering DAC allows simple control, good monotonicity and improved transient response when compared to previous design as well as potential power reduction.}, language = {en} }