Now showing items 1-5 of 5

    • 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 ...
    • 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 ...