Kontakt
Raum: 43.2.252
Telefon: +49 (0)731 50 32267
johannes.wagner(at)uni-ulm.de
Dr.-Ing. 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 and received the Dr.-Ing. degree under the supervision of Professor Dr.-Ing. Maurits Ortmanns in May 2021. My research area is the system-level modeling and optimization of Sigma-Delta ADCs.
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
- Niklas Klefe
CT I-SD MASH ADCs at Low Oversampling Ratios [mt] - Sebastian Kaltenstadler
Analysis of Neural Networks for the Prediction of Stability and Performance of Sigma-Delta ADCs [mt] - 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
2021
22.
Wagner,
J.;
Miki,
T.;
Ortmanns,
M.
Compensation of Finite GBW in CT Baddpass SDMs Based on Single-OpAmp Resonators with Positive-Feedback
IEEE 64th International Midwest Symposium on Circuits and Systems (MWSCAS)
August 2021
Compensation of Finite GBW in CT Baddpass SDMs Based on Single-OpAmp Resonators with Positive-Feedback
IEEE 64th International Midwest Symposium on Circuits and Systems (MWSCAS)
August 2021
21.
Pietzko,
M.;
Wagner,
J.;
Abdelaal,
A.;
Kauffman,
J. G.;
Ortmanns,
M.
Influence of Excess Loop Delay on the STF of Continuous-Time Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea (Online)
May 2021
Influence of Excess Loop Delay on the STF of Continuous-Time Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea (Online)
May 2021
2020
20.
Wagner,
J.;
Vogelmann,
P.;
Ortmanns,
M.
An Automated Design Environment for CT Incremental Sigma-Delta ADCs
27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)
November 2020
An Automated Design Environment for CT Incremental Sigma-Delta ADCs
27th IEEE International Conference on Electronics, Circuits and Systems (ICECS)
November 2020
19.
Vogelmann,
P.;
Wagner,
J.;
Ortmanns,
M.
A 14b, Twofold Time-Interleaved Incremental ΔΣ ADC Using Hardware Sharing
IEEE Transactions on Circuits and Systems I: Regular Papers
July 2020
A 14b, Twofold Time-Interleaved Incremental ΔΣ ADC Using Hardware Sharing
IEEE Transactions on Circuits and Systems I: Regular Papers
July 2020
| DOI: | 10.1109/TCSI.2020.3011362 |
18.
Wagner,
J.;
Vogelmann,
P.;
Ortmanns,
M.
Performance Evaluation of Incremental Sigma-Delta ADCs Based on their NTF
IEEE Transactions on Circuits and Systems—II: Express Briefs (Early Access)
March 2020
Performance Evaluation of Incremental Sigma-Delta ADCs Based on their NTF
IEEE Transactions on Circuits and Systems—II: Express Briefs (Early Access)
March 2020
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
On the Signal Filtering Property of CT Incremental Sigma-Delta ADCs
IEEE Transactions on Circuits and Systems—II: Express Briefs
November 2019
16.
Mokhtar,
M. A.;
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
Incremental Sturdy-MASH Sigma-Delta Modulator with Reduced Sensitivity to DAC Mismatch
IEEE International Symposium on Circuits and Systems (ISCAS), Sapporo, Japan
May 2019
15.
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
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 |
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
A Dynamic Power Reduction Technique for Incremental ΔΣ Modulators
IEEE Journal of Solid-State Circuits
January 2019
2018
13.
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
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
12.
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
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
11.
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
Man or Machine — Design Automation of Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Florence, Italy, pp. 1-5
May 2018
10.
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
On Incremental ∆Σ Modulators with SNR and SQNR Enhancement by Recuperation Phase
IEEE International Symposium on Circuits and Systems (ISCAS), Florence, Italy
May 2018
| File: |  https://www.uni-ulm.de/fileadmin/website_uni_ulm/iui.inst.010/downloads/Vogelmann_ISCAS_2018-05.pdf |
9.
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
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
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
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
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
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
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
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
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
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
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
Post-Doc
