TY - GEN A1 - Mendonca, Lucas Sangoi A1 - Radecker, Matthias A1 - Killat, Dirk A1 - Bisogno, Fábio Ecke T1 - Normalized State-Space Models of Resonant Rectifiers T2 - 2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany N2 - 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. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8890156 SN - 978-3-948571-00-9 ER - TY - GEN A1 - Ulmann, Bernd A1 - Killat, Dirk T1 - Solving systems of linear equations on analog computers T2 - 2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany N2 - 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. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8890096 SN - 978-3-948571-00-9 ER - TY - GEN A1 - Mendonca, Lucas Sangoi A1 - Martins, Leandro Tomé A1 - Radecker, Matthias A1 - Bisogno, Fábio Ecke A1 - Killat, Dirk T1 - Normalized Modeling of Piezoelectric Energy Harvester Based on Equivalence Transformation and Unit-Less Parameters T2 - Journal of Microelectromechanical Systems N2 - 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]. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8745680 U6 - https://doi.org/10.1109/JMEMS.2019.2921649 SN - 1941-0158 SN - 1057-7157 VL - 28 IS - 4 SP - 666 EP - 677 ER - TY - PAT A1 - Hong, Zhiliang A1 - Killat, Dirk A1 - Xu, Weiwei T1 - Switching converter and method for controlling a switching converter Y1 - 2010 ER - TY - GEN A1 - Bramburger, Stefan A1 - Killat, Dirk T1 - 10-bit tracking ADC with a multi-bit quantizer, variable step size and segmented current-steering DAC T2 - Advances in Radio Science N2 - 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. Y1 - 2019 UR - https://ars.copernicus.org/articles/17/161/2019/ U6 - https://doi.org/10.5194/ars-17-161-2019 SN - 1684-9973 SN - 1684-9965 VL - Vol. 17 SP - 161 EP - 167 ER - TY - PAT A1 - Killat, Dirk A1 - Pitonak, Pavol T1 - Verfahren und Schaltungsanordnung zur reduzierung eines Einflusses eines Taktjitters in einem Delta-Sigma-Modulator Y1 - 2017 ER - TY - PAT A1 - Killat, Dirk A1 - Pitonak, Pavol T1 - Analog-Digital-Umsetzer und Verfahren zur Umwandlung eines ursprünglich analogen Signals in ein konvertiertes Digitalsignal Y1 - 2017 ER - TY - PAT A1 - Killat, Dirk A1 - Rombach, Pirmin T1 - Vorrichtung und Verfahren zur berührungslosen Messung von Drehmomenten an Wellen Y1 - 1993 ER - TY - GEN A1 - Ulmann, Bernd A1 - Köppel, Sven A1 - Killat, Dirk T1 - Open Hardware Analog Computer for Education – Design and Application T2 - 2021 Kleinheubach Conference, 28-30 September 2021 Y1 - 2021 SN - 978-3-948571-04-7 SN - 978-1-6654-0711-3 U6 - https://doi.org/10.23919/IEEECONF54431.2021.9598447 ER - TY - GEN A1 - Köppel, Sven A1 - Ulmann, Bernd A1 - Heimann, Lars A1 - Killat, Dirk T1 - Using analog computers in today's largest computational challenges T2 - Advances in Radio Science Y1 - 2021 U6 - https://doi.org/10.5194/ars-19-105-2021 SN - 1684-9973 VL - 19 SP - 105 EP - 116 ER - TY - GEN A1 - Venkatesha, Shishira S. A1 - Pitonak, Pavol A1 - Killat, Dirk T1 - Active and continuous compensation of clock jitter in CT Delta-Sigma ADCs T2 - 3rd URSI Atlantic and Asia Pacific Radio Science Meeting, 30 May - 04 June 2022, Gran Canaria, Spain Y1 - 2022 SN - 978-9-4639-6-8058 SN - 978-1-6654-9986-6 U6 - https://doi.org/10.23919/AT-AP-RASC54737.2022.9814404 PB - IEEE Explore ER - TY - GEN A1 - Pitonak, Pavol A1 - Killat, Dirk T1 - Time-continuous Delta-Sigma-Modulator with switchable resistors in 65 nm CMOS Technology T2 - 3rd URSI Atlantic and Asia Pacific Radio Science Meeting, 30 May - 04 June 2022, Gran Canaria, Spain Y1 - 2022 SN - 978-9-4639-6-8058 SN - 978-1-6654-9986-6 U6 - https://doi.org/10.23919/AT-AP-RASC54737.2022.9814345 PB - IEEE Xplore ER - TY - GEN A1 - Killat, Dirk A1 - Ulmann, Bernd A1 - Köppel, Sven T1 - Hybrid integrators for analog computers T2 - Kleinheubach Conference, 27. - 29. September, 2022, Miltenberg, Germany Y1 - 2022 UR - https://ieeexplore.ieee.org/document/9954508 SN - 978-3-948571-07-8 SP - 1 EP - 4 PB - IEEE ER - TY - GEN A1 - Venkatesha, Shishira S. A1 - Killat, Dirk T1 - A fully differential 3-stage CMOS op-amp for high-speed sampling applications T2 - 2023 Kleinheubach Conference, September 26 - 28, 2023, Miltenberg, Germany Y1 - 2023 UR - https://ieeexplore.ieee.org/document/10296724 SN - 978-3-948571-08-5 SP - 1 EP - 4 PB - IEEE CY - Piscataway ER - TY - GEN A1 - Pitonak, Pavol A1 - Killat, Dirk T1 - Dynamic delta sigma ADC with variable clock on 65 nm CMOS T2 - 2023 Kleinheubach Conference, September 26-28, 2023, Miltenberg, Germany Y1 - 2023 UR - https://ieeexplore.ieee.org/document/10296769 SN - 978-3-948571-08-5 SP - 1 EP - 3 PB - IEEE CY - Piscataway ER - TY - GEN A1 - Killat, Dirk A1 - Ulmann, Bernd A1 - Köppel, Sven T1 - Hybrid integrators with predictive overload estimation for analog computers and continuous-time ΔΣ modulators T2 - Advances in Radio Science Y1 - 2023 U6 - https://doi.org/10.5194/ars-21-89-2023 SN - 1684-9973 VL - 21 SP - 89 EP - 100 ER - TY - GEN A1 - Killat, Dirk A1 - Köppel, Sven A1 - Ulmann, Bernd A1 - Wetzel, Lucas T1 - Solving Partial Differential Equations with Monte Carlo / Random Walk on an Analog-Digital Hybrid Computer T2 - Tagungsband MikroSystemTechnik Kongress 2023, Dresden, 23. - 25. Oktober 2023 Y1 - 2023 SN - 978-3-8007-6203-3 SN - 978-3-8007-6204-0 SP - 556 EP - 564 PB - VDE Verlag CY - Berlin ER - TY - GEN A1 - Vijayakumar, Shreyas Subramanya A1 - Pitonak, Pavol A1 - Killat, Dirk T1 - A Function Generator on TSMC 65nm CMOS for Analog Computing T2 - 2024 Kleinheubach Conference, September 24-26, 2024, Miltenberg, Germany N2 - This paper presents a detailed analysis of a function generator that utilizes a fully differential analog input processed through a current subtractor, offset comparators, thermometercoded current steering X-iDAC, programmable ROM, 11-to-32 decoder and Y-iDAC. This configuration enables precise and customizable waveform generation, crucial for various applications in analog computing and signal processing. KW - Signal generators;Decoding;Read only memory;Function generator;current subtractor;offset comparators;X-iDAC;programmable ROM;11-to-32 decoder;Y-iDAC Y1 - 2024 UR - https://ieeexplore.ieee.org/document/10739166 U6 - https://doi.org/10.23919/IEEECONF64570.2024.10739166 PB - IEEE ER - TY - GEN A1 - Venkatesha, Shishira S A1 - Killat, Dirk T1 - Design of a fully differential track-and-hold amplifier T2 - 2025 Kleinheubach Conference N2 - This paper presents a fully differential track-and-hold amplifier (THA) architecture for high-speed applications. The proposed design employs a distinctive switching arrangement that converts non-linear errors into a constant offset and provides an initialization sub-phase before tracking. The circuit utilizes two capacitors in the signal path to enable gain flexibility, providing an accurate output during hold mode. The THA was implemented in 65−nm CMOS technology with a 1.2 V supply voltage. The results of the simulation after layout demonstrate a droop rate of 2.5mV/μS, a hold-mode settling time of 2ns for a 1pF hold capacitor. KW - CMOS KW - Track-and-hold KW - Switched capacitor KW - High-speed KW - Transmission gates KW - Charge injection Y1 - 2025 U6 - https://doi.org/10.23919/IEEECONF67516.2025.11225213 SP - 1 EP - 4 PB - IEEE CY - Piscataway, NJ ER - TY - GEN A1 - Killat, Dirk A1 - Pitonak, Pavol A1 - Ulmann, Bernd T1 - High-precision CMOS multiplier with wide dynamic range T2 - 2025 32nd IEEE International Conference on Electronics, Circuits and Systems (ICECS) N2 - Multipliers are an important general-purpose analog function. Precision multipliers are still mostly based on bipolar transistors. In CMOS, small-signal based multipliers are often used as mixers. There are many approaches in CMOS that use the squaring characteristics of the MOSFET, but they do not come close to the accuracy and linearity of bipolar multipliers. This paper presents a new principle and verifies it on a four-quadrant multiplier on a test chip in 65 nm CMOS technology. A new type of input predistortion is used to drive the cascaded differential stage. With a supply voltage of 1.2 V and differential input signals of up to ±700 mV, a linearity of better than 0.5 % of the measurement range is achieved over a wide temperature and frequency range. KW - Multiplier KW - CMOS KW - Linear KW - Gilbert cell Y1 - 2025 SN - 979-8-3315-9585-2 U6 - https://doi.org/10.1109/ICECS66544.2025.11270705 SN - 2995-0589 SP - 1 EP - 4 PB - IEEE CY - Piscataway, NJ ER -