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

Aktuelle Arbeiten

  • Sebastian Kaltenstadler
    Analysis of Neural Networks for the Prediction of Stability and Performance of Sigma-Delta ADCs [mt]

Abgeschlossene Arbeiten

  • Roman Dorsch
    Analysis of CT Incremental Sigma-Delta ADCs with low Oversampling Ratios [mt]
  • Benedikt Merk
    Implementierung und Evaluation von FIR Filtern im Rückkoppelpfad von Sigma-Delta Modulatoren für ein automatisiertes Entwurfswerkzeug [rp]
  • David Schultheiß
    Entwurf und Evaluation eines neuronalen Netzwerks zur Vorhersage der Stabilität und Performanz von Sigma-Delta Modulatoren [rp]
  • Jonathan Ungethüm
    Design and Evaluation of a Reconfigurable ΣΔ-Modulator on PCB Level for Verification of an Online Optimization Tool [mt]
  • Felix Vogel
    Nonlinearity Modelling in the Loop Filter of Continuous-Time Sigma-Delta Modulators for an Automated Synthesis Tool [mt]
  • Alexander Kast (Z)
    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

2019

17.
Wagner , J. ; Vogelmann , P. ; Ortmanns , M.
On the Signal Filtering Property of CT Incremental Sigma-Delta ADCs
IEEE Transactions on Circuits and Systems—II: Express Briefs
November 2019
16.
Luo , Y. ; Jain , A. ; Wagner , J. ; Ortmanns , M.
Input Referred Comparator Noise in SAR ADCs
IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 66, no. 5, pp. 718-722
May 2019
DOI: 10.1109/TCSII.2019.2909429
15.
Mokhtar , M. ; Vogelmann , P. ; Wagner , J. ; Ortmanns , M.
Incremental Sturdy-MASH Sigma-Delta Modulator with Reduced Sensitivity to DAC Mismatch
IEEE International Symposium on Circuits and Systems (ISCAS), Sapporo, Japan
May 2019
14.
Vogelmann , P. ; Wagner , J. ; Haas , M. ; Ortmanns , M.
A Dynamic Power Reduction Technique for Incremental ΔΣ Modulators
IEEE Journal of Solid-State Circuits
January 2019

2018

13.
Wagner , J. ; Vogelmann , P. ; Ortmanns , M.
On the Optimization of DT Incremental Sigma-Delta Modulators in Combination with CoI Reconstruction Filters
2nd New Generation of Circuits & Systems Conference (NGCAS 2018), Valetta, Malta
November 2018
12.
Wagner , J. ; Vogel , F. ; Kuhm , F. ; Ortmanns , M.
Automated Synthesis of Subsampling CT Bandpass Sigma-Delta Modulators with Non-Idealities
2nd New Generation of Circuits & Systems Conference (NGCAS 2018), Valetta, Malta
November 2018
11.
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
10.
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
9.
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
https://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.010/downloads/Vogelmann_ISCAS_2018-05.pdf

2017

8.
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
7.
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

2016

6.
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
5.
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
4.
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
3.
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
2.
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
1.
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