M.Sc. Johannes Wagner

I studied electrical engineering at the University of Ulm, where I received my B.Sc. degree in 2012 and my M.Sc. degree in 2015. During my Bachelor I focused on material science for electrical devices resulting in the Bachelor thesis with the title "Herstellung von Probenträgern für Hallmessungen an Graphen in-situ in einem Transmissionselektronenmikroskop". My master was focused on microelectronics. I finished it with the Master thesis titled "Model Extension of an Online Tool for the Heuristic Design of CT Sigma-Delta Modulators".

In September 2015 I began my work at the University of Ulm towards the Ph.D. degree under the supervision of Professor Dr.-Ing. Maurits Ortmanns. My research area is the modeling and optimization of Sigma-Delta modulators.

Projekte

Online Tool for Rapid Continuous-Time ΣΔ Modulator Design

J. Wagner: ΣΔ A/D converters are the state of the art for many different applications. The basis for this type of A/D converter is the ΣΔ modulator. For a long time, discrete-time (DT) ΣΔ modulators dominated as their design techniques could easily be adopted to ensured high performance... [ more]

Studentische Arbeiten

[mt] = Masterarbeit, [rp] = Bachelorarbeit

Abgeschlossene Arbeiten

  • Alexander Kast
    Architectural Optimization of CT ΣΔ ADCs [rp]
  • Sinan Yargeldi
    Implementation of Digital Filters in the Feedback Path of Sigma-Delta Modulators for an Automated Synthesis Tool [rp]
  • Felix Vogel
    Modelling, Simulation and Verification of Higher Order Filters for a Sigma-Delta ADC Synthesis Tool [rp]
  • Manuel Keller
    Implementierung und Evaluation eines zellularen Genetischen Algorithmus für die Optimierung von zeitkontinuierlichen Sigma-Delta Modulatoren [rp]

Publikationen


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Vogelmann, P.; Wagner, J.; Hänsler, A.; Ortmanns, M.
Improved SQNR and MSA in Incremental ΔΣ Modulators by Using a Recuperation Phase
IEEE Transactions on Circuits and Systems—II: Express Briefs, Vol. 65, No. 5,
May 2018
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Vogelmann, P.; Wagner, J.; Hänsler, A.; Ortmanns, M.
On Incremental ∆Σ Modulators with SNR and SQNR Enhancement by Recuperation Phase
IEEE International Symposium on Circuits and Systems (ISCAS), Florence, Italy,
May 2018
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Wagner, J.; Ortmanns, M.; de la Rosa, J. M.
Man or Machine — Design Automation of Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Florence, Italy, pp. 1-5,
May 2018
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Wagner, J.; Chi, J.; Ortmanns, M.
Designing CT Bandpass Sigma-Delta Modulators with Arbitrary STF Shapes
IEEE International Symposium on Circuits and Systems (ISCAS 2017), Baltimore, USA,
May 2017
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Chi, J.; Wagner, J.; Anders, J.; Ortmanns, M.
Digital Interferer Suppression and Jitter Reduction in Continuous-Time Bandpass Sigma Delta Modulators
IEEE International Symposium on Circuits and Systems (ISCAS 2017), Baltimore, USA,
May 2017
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Wagner, J.; Chi, J.; Ortmanns, M.
Designing CT ΣΔ Modulators with Shaped Feedback Waveforms using www.sigma-delta.de
23rd IEEE International Conference on Electronics, Circuits and Systems (ICECS), Monaco,
December 2016
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Wagner, J.; Reich, S.; Ritter, R.; Anders, J.; Ortmanns, M.
Finite GBW in Single OpAmp CT ΣΔ Modulators
23rd IEEE International Conference on Electronics, Circuits and Systems (ICECS), Monaco,
December 2016
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Chi, J.; Ritter, R.; Wagner, J.; Ortmanns, M.
Phase Noise vs. Jitter Analysis in Continuous-Time LP and BP Sigma Delta Modulators with Interferers
23rd IEEE International Conference on Electronics, Circuits and Systems (ICECS), Monaco,
December 2016
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Chu, C.; Wagner, J.; Al Marashli, A.; Chi, J.; Ortmanns, M.
A Study on Op-amp Nonlinearity in a Single-bit CT Modulator Employing GBW Compensation
Conference on PhD Research in Microelectronics and Electronics (PRIME 2016), Lisbon, Portugal,
June 2016
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Wagner, J.; Ritter, R.; Ortmanns, M.
STF Engineering in CT Sigma-Delta Modulators using www.sigma-delta.de
Conference on PhD Research in Microelectronics and Electronics (PRIME 2016), Lisbon, Portugal,
June 2016
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Wagner, J.; Ritter, R.; Ortmanns, M.
Using www.sigma-delta.de to Rapidly Obtain ELD Compensated CT ΣΔ Modulators
IEEE International Symposium on Circuits and Systems (ISCAS 2016), Montréal, Québec, Canada,
May 2016

Wissenschaftl. Mitarbeiter

Johannes Wagner