Contact
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.
Publications
2024
28.
Kässer,
P.;
Kaltenstadler,
S.;
Conrad,
J.;
Wagner,
J.;
Ismail,
O.;
Ortmanns,
M.
Stability Prediction of Δ∑ Modulators using Artificial Neural Networks
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore
May 2024
Stability Prediction of Δ∑ Modulators using Artificial Neural Networks
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore
May 2024
| DOI: | 10.1109/ISCAS58744.2024.10557868 |
27.
Kässer,
P.;
Wagner,
J.;
Ismail,
O.;
Ortmanns,
M.
Inner Transfer Functions in Incremental ΔΣ ADCs
IEEE Transactions on Circuits and Systems II: Express Briefs
April 2024
Inner Transfer Functions in Incremental ΔΣ ADCs
IEEE Transactions on Circuits and Systems II: Express Briefs
April 2024
| DOI: | 10.1109/TCSII.2024.3390397 |
2023
26.
Kässer,
P.;
Wagner,
J.;
Ismail,
O.;
Driemeyer,
B.;
Ortmanns,
M.
Quantizer Gain in Incremental Delta-Sigma ADCs
30th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Istanbul, Turkiye, pp. 1-4
December 2023
Quantizer Gain in Incremental Delta-Sigma ADCs
30th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Istanbul, Turkiye, pp. 1-4
December 2023
| DOI: | 10.1109/ICECS58634.2023.10382904 |
25.
Kässer,
P.;
Ismail,
O.;
Wagner,
J.;
Fischer,
R.;
Ortmanns,
M.
Frequency-Domain Analysis of Reconfigured Incremental ΔΣ ADCs on the Example of the Exponential Phase
IEEE Transactions on Circuits and Systems I: Regular Papers
September 2023
Frequency-Domain Analysis of Reconfigured Incremental ΔΣ ADCs on the Example of the Exponential Phase
IEEE Transactions on Circuits and Systems I: Regular Papers
September 2023
| DOI: | 10.1109/TCSI.2023.3310655 |
24.
Kässer,
P.;
Ismail,
O.;
Rudorf,
C.;
Wagner,
J.;
Ortmanns,
M.
Linear-Exponential I-DS ADCs: Analysis, Limitations and Higher Order
IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, CA, USA, pp. 1-5
May 2023
Linear-Exponential I-DS ADCs: Analysis, Limitations and Higher Order
IEEE International Symposium on Circuits and Systems (ISCAS), Monterey, CA, USA, pp. 1-5
May 2023
| DOI: | 10.1109/ISCAS46773.2023.10182215 |
2022
23.
Wagner,
J.;
Mokhtar,
M. A.;
Ortmanns,
M.
Automated Design of Sigma-Delta Modulators with FIR Feedback
IEEE International Symposium on Circuits and Systems (ISCAS), Austin, USA
June 2022
Automated Design of Sigma-Delta Modulators with FIR Feedback
IEEE International Symposium on Circuits and Systems (ISCAS), Austin, USA
June 2022
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.
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
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
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
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 |
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
Guest Scientist
