Now showing items 1-16 of 16

    • A high speed/high linearity continuous-time delta-sigma modulator 

      Chu, Chao (Universität Ulm, 2017-12-01)
      Modern wireless communication systems demand wideband ADCs with high resolution and high linearity. Among different ADC topologies, CT Delta Sigma modulators are very popular due to inherent anti-aliasing filtering and ...
    • An Arbiter PUF employing eye-opening oscillation for improved noise suppression 

      Beitrag zu einer Konferenz
      Herkle, Andreas; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2018-05-04)
      Like every integrated circuit, Arbiter-PUFs suffer from any ambience variations such as electrical noise, supply voltage variations and temperature fluctuations. In this work, we show that most bit-errors are related to ...
    • An evaluation study of various excitation signals for electrical impedance spectroscopy 

      Beitrag zu einer Konferenz
      Rajabzadeh, Mahdi; Ungethuem, Jonathan; Mandry, Holger; Schilpp, Carolin; Wittekindt, Oliver; Ortmanns, Maurits (Universität Ulm, 2019-05-01)
      Electrical Impedance Spectroscopy (EIS) is a popular method for investigating tissue properties. Implementing the signal generator for EIS measurements with a suitable excitation signal type is thereby one of the two system ...
    • An integrated readout for current sensing based on a delta sigma modulator with switched capacitor feedback 

      Beitrag zu einer Konferenz
      Rajabzadeh, Mahdi; Häberle, Matthias; Jain, Ankesh; Ortmanns, Maurits (Universität Ulm, 2019-11-18)
      This work presents a current input continuous-time sigma-delta modulator (C-CTSDM) for biomedical application such as electrochemical impedance spectroscopy. Low noise and low area current input digitizers are required to ...
    • Comparison of direct digitization current sensing circuits for EIS 

      Beitrag zu einer Konferenz
      Rajabzadeh, Mahdi; Häberle, Matthias; Ortmanns, Maurits (Universität Ulm, 2019-08-05)
      In this work, a qualitative comparison between state of the art current recorders for biomedical applications is presented. Prior work showed that direct digitizing frontends outweight their analog counterparts. This work ...
    • Comparison study of integrated potentiostats : Resistive-TIA, Capacitive-TIA, CT ΣΔ Modulator 

      Beitrag zu einer Konferenz
      Rajabzadeh, Mahdi; Djekic, Denis; Häberle, Matthias; Becker, Joachim; Anders, Jens; Ortmanns, Maurits (Universität Ulm, 2018-05-04)
      In this paper, a comparison between three different current readouts for micro-potentiostats is presented: resistive transimpedance amplifier (R-TIA), capacitive transimpedance amplifier (C-TIA), and current-mode continuous-time ...
    • Concept and design of a high speed current mode based SAR ADC 

      Elkafrawy, Abdelrahman (Universität Ulm, 2016-07-20)
      There is continuous research to exploit the improved speed of scaled CMOS technologies in realizing high-speed analog-to-digital converters and SAR ADCs are one of the candidates which can significantly benefit from this ...
    • Enhanced Arbiter PUFs using custom sized structures for reduced noise sensitivity 

      Beitrag zu einer Konferenz
      Herkle, Andreas; Schuster, Markus; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2019-08-14)
      This paper presents a simple yet effective way of improving delay based Physical Unclonable Functions by changing transistor gate sizes only. All utilized components of an Arbiter PUF were simulated in a 90nm CMOS process ...
    • Evaluation of single-bit sigma-delta modulator DAC for electrical impedance spectroscopy 

      Beitrag zu einer Konferenz
      Rajabzadeh, Mahdi; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2017-03-29)
      In this paper, single-bit sigma-delta modulator based digital-analog conversion (DAC) is evaluated as potential driver in multichannel electrical impedance spectroscopy (EIS) arrays. The sinusoidal excitation with typical ...
    • Exploiting Weak PUFs from Data Converter Non-Linearity - E.g. A multibit CT ∆Σ Modulator 

      Wissenschaftlicher Artikel
      Herkle, Andreas; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2019-08-14)
      This paper presents a novel approach of deriving Physical Unclonable Functions (PUF) from correction circuits measuring and digitizing non-linearities of data converters. The often digitally available correction data can ...
    • Fully integrated, multichannel IC for brain machine interfaces 

      Haas, Michael (Universität Ulm, 2019-10-25)
      The rapid progress of technology in the semiconductor industry over the last decades allowed the development of a whole new generation of fully integrated neuromodulators. By an increase in the level of integration, new ...
    • High linearity Sigma-Delta-enhanced SAR ADCs 

      AlMarashli, Ahmad (Universität Ulm, 2019-06-11)
      SAR ADCs recorded the highest power efficiency in the last decade, while employing a simple architecture and making a perfect use of the advanced digital capabilities in modern deeply-scaled CMOS technologies. Recently, ...
    • In-depth Analysis and Enhancements of RO-PUFs with a Partial Reconfiguration Framework on Xilinx Zynq-7000 SoC FPGAs 

      Beitrag zu einer Konferenz
      Herkle, Andreas; Mandry, Holger; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2019-08-14)
      Physical unclonable functions (PUFs) are excellent candidates to generate secret information on-chip without the need for secure storage. Ring-oscillator (RO) based PUFs have been receiving great attention over the years ...
    • Methoden zur Verbesserung von CMOS integrierten Arbiter-PUFs 

      Beitrag zu einer Konferenz
      Herkle, Andreas; Becker, Joachim; Ortmanns, Maurits (Universität Ulm, 2019-08-16)
      In diesem Beitrag wird eine Auswahl von Methoden zur Verbesserung integrierter CMOS PUFs vorgestellt. Am Beispiel der Arbiter-PUF zeigen wir, dass sowohl die PUF-definierenden Zufallsquellen erheblich optimiert werden ...
    • Modular PUF coding chain with high-speed Reed-Muller decoder 

      Beitrag zu einer Konferenz
      Mandry, Holger; Herkle, Andreas; Kürzinger, Ludwig; Müelich, Sven; Becker, Joachim; Fischer, Robert F. H.; Ortmanns, Maurits (Universität Ulm, 2019-05-01)
      Physical Unclonable Functions (PUFs) offer the possibility to produce unique fingerprints for integrated circuits. As raw PUF responses are affected by noise, some post-processing steps are necessary. We present a coding ...
    • Pulse modulation techniques for switched-mode transmitter 

      Ostrovskyy, Pylyp (Universität Ulm, 2016-04-25)
      Nowadays more and more communication devices incorporate multiple transceivers operating in different frequency bands. To reduce form factor and power consumption of such devices, a fully digital, multi-standard, multiband ...