M.Sc. Mahdi Rajabzadeh

Mahdi Rajabzadeh received his B.Sc. degree in Bio-Medical Engineering (bio-electical) from Azad University, Mashhad, Iran, in 2011, where he worked on bio-signal processing. He came to Germany in 2013 to pursue his M.S. degree in Microsystems Engineering at IMTEK, Albert Ludwig University of Freiburg, Germany, and graduated in 2016. His work focused on Bio-amplifiers for his master thesis, and as a student assistant at the Fritz Hüttinger Chair of Microelectronics (IMTEK), he worked on micro-electronic mirror.

In June 2016, he joined the Institute of Microeletronics at University of Ulm as research assistance under the supervision of Prof. Maurits Ortmanns, where he worked on Bio-amplifiers. He started his Ph.d at University of Ulm in October 2016 on the topic: Electrochemical Sensor Integrated Circuits, which is a part of the PULMOSENSE project. He is currently working on developing multi-channel implementations of electrochemical measurement techniques on CMOS integrated circuits for use on lung epithelia in vitro.

M.Sc. Mahdi Rajabzadeh get's Best Paper Award (Bronze) at BioCAS 2019 ( Biomedical Circuits an Systems Conference), Nara, Japan, October 2019


Electrochemical Sensor Integrated Circuits

M. Rajabzadeh: The electrochemical detection of target molecules, the analysis of bioimpedances and the realization in microsystems have received an increasing attention lately. Chronoamperometry (CA), cyclic voltammetry (CV) and electrical impedance spectroscopy (EIS) are the most common methods that are used for the analysis of endogenous and exogenous molecules or electrical properties of tissues ... [more]

Student theses

[rp] = Bachelor theses, [mt] = Master theses

Abgeschlossene Arbeiten

  • Sundareswaran Oblan Balasubramanian
    Current readout Zoom Incremental CT-Sigma Delta modulator for Electrochemical impedance spectroscopy [mt]
  • Steffen Vogelmann
    Single Bit Sigma-Delta Modultor DAC for Electrical Impedance Spectroscopy [mt]



Rajabzadeh, M.; Häberle, M.; Becker, J.; Ortmanns, M.
Comparison Study of DAC Realizations in Current Input CTΣΔ Modulators
IEEE Transactions on Circuits and Systems II: Express Briefs
Juli 2020


Rajabzadeh, M.; Ungethüm, J.; Herkle, A.; Schilpp, C.; Fauler, M.; Wittekindt, O.; Ortmanns, M.
A 24-Ch. Multi-Electrode Array Allowing Fast EIS to Determine Transepithelial Electrical Resistance
2019 IEEE Biomedical Circuits and Systems Conference (BioCAS), Nara, Japan
Oktober 2019
Rajabzadeh, M.; Häberle, M.; Jain, A.; Ortmanns, M.
An Integrated Readout for Current Sensing Based on a Sigma Delta Modulator with Switched Capacitor Feedback
IEEE European Solid-State Circuits conference (ESSDERC/ESSCIRC), Krakow, Poland
September 2019
Rajabzadeh, M.; Häberle, M.; Ortmanns, M.
Comparison of Direct Digitization Current Sensing Circuits for EIS
15th Conference on PhD Research in Microelectronics and Electronics (PRIME 2019), Lausanne, Switzerland
Juli 2019
Rajabzadeh, M.; Ungethüm, J.; Mandry, H.; Schilpp, C.; Wittekindt, O.; Ortmanns, M.
An Evaluation Study of Various Excitation Signals for Electrical Impedance Spectroscopy
IEEE International Symposium on Circuits and Systems (ISCAS), Sapporo, Japan
Mai 2019
Häberle, M.; Djekic, D.; Rajabzadeh, M.; Fantner, G.; Lips, K.; Ortmanns, M.; Anders, J.
Comparison of Different Precision Pseudo Resistor Realizations in the DC-Feedback of Capacitive Transimpedance Amplifiers
IEEE International Conference on Electronics Circuits and Systems (ICECS 2019), Genova, Italy pp. 699-702


Rajabzadeh, M.; Djekic, D.; Häberle, M.; Becker, J.; Anders, J.; Ortmanns, M.
Comparison Study of Integrated Potentiostats: Resistive-TIA, Capacitive-TIA, CT Σ∆ Modulator
IEEE International Symposium on Circuits & Systems (ISCAS), Florence, Italy
Mai 2018


Rajabzadeh, M.; Becker, J.; Ortmanns, M.
Evaluation of Single-Bit Sigma-Delta Modulator DAC for Electrical Impedance Spectroscopy
2017 IEEE Biomedical Circuits and Systems Conference (BioCAS), Torino, Italy
Oktober 2017
Haas, M.; Rajabzadeh, M.; Ortmanns, M.
Performance evaluation of state-of-the-art neural recorder SoCs
BMT 2017, Dresden, Germany
September 2017

Research Assistant

Mahdi Rajabzadeh