Institute of Microelectronics

M.Sc. Paul Kässer

Paul Kässer studied Electrical Engineering at the University of Ulm where he received his B.Sc. degree in 2018 and his M.Sc. in 2021. The topic of his Master thesis was ''Development and Test of a Mixed-Signal Neural-Network Processing-Element''.

During his bachelor studies, he did an internship in India at TVS Motor Company in control engineering, where he built a motion-controlled robot arm. At the end of his master studies, he pursued another internship at Qualcomm, where he was working in the field of Custom Design Automation.

Since September 2021 he is working as research assistant towards the Ph.D. degree under the supervision of Prof. Dr.-Ing Maurits Ortmanns. His research area is the system-level modeling and optimization of Sigma-Delta ADCs.

Student theses

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

Past theses

  • Qiuyang Zhang
    Development and Test of a Reliable Capacitance-to-Digital Converter for PUF Readouts [mt]

Publications

2025

17.
Kässer, P.; Ismail, O.; Becker, J.; Ortmanns, M.
Compensation of Excess Loop Delay in Continuous-Time Incremental ∆Σ ADCs
IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, pp. 1-5
May 2025
DOI:10.1109/ISCAS56072.2025.11044169
16.
Kässer, P.; Ismail, O.; Becker, J.; Ortmanns, M.
Does the Maximum Stable Amplitude depend on Reconstruction Filters in Incremental ∆Σ ADCs?
IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, pp. 1-5
May 2025
DOI:10.1109/ISCAS56072.2025.11043924
15.
Ismail, O.; Kässer, P.; Sporer, M.; Kauffman, J. G.; Ortmanns, M.
Incremental ∆Σ ADCs without Periodic Reset
IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, pp. 1-5
May 2025
DOI:10.1109/ISCAS56072.2025.11043980
14.
Conrad, J.; Wilhelmstätter, S.; Mandry, H.; Kässer, P.; Abdelaal, A.; Asthana, R.; Belagiannis, V.; Ortmanns, M.
PSumSim: A Simulator for Partial-Sum Quantization in Analog Matrix-Vector Multipliers
IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, pp. 1-5
May 2025
DOI:10.1109/ISCAS56072.2025.11043442
13.
Ismail, O.; Kässer, P.; Ortmanns, M.
Reducing the Impact of Non-Idealities on Incremental Δ∑ ADCs by Reconfiguration: A Review
IEEE Custom Integrated Circuits Conference (CICC), Boston, MA, USA, pp. 1-8
April 2025
DOI:10.1109/CICC63670.2025.10983744
12.
Aziz, M.; Kässer, P.; Ibrahim, S.; Ortmanns, M.
A Comparative Study of Incremental ΔΣ Analog-to-Digital Converter Architectures with Extended Order and Resolution
MDPI Electronics 2025, 14, 372
January 2025
DOI:10.3390/electronics14020372

2024

11.
Kässer, P.; Ismail, O.; Wiens, D.-P.; Ortmanns, M.
Offset Cancellation in Incremental ∆Σ ADCs
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore
May 2024
DOI:10.1109/ISCAS58744.2024.10557952
10.
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
DOI:10.1109/ISCAS58744.2024.10557868
9.
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
DOI:10.1109/TCSII.2024.3390397
8.
Ismail, O.; Kässer, P.; Kauffman, J. G.; Ortmanns, M.
Non-Ideal Reset in Incremental Delta-Sigma ADCs
IEEE 22nd Interregional NEWCAS Conference Sherbrooke, Quebec, Canada
April 2024
7.
Ismail, O.; Kässer, P.; Kauffman, J. G.; Ortmanns, M.
DAC Element Mismatch Shaping Algorithms in Incremental Delta-Sigma ADCs
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore
January 2024
DOI:10.1109/ISCAS58744.2024.10558337

2023

6.
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
DOI:10.1109/ICECS58634.2023.10382904
5.
Driemeyer, B.; Kässer, P.; Mandry, H.; Wiens, D.-P.; Ortmanns, M.
A Feasibility Study on a Switched-Capacitor Based PUF in 28 nm Technology
30th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Istanbul, Turkiye
December 2023
DOI:10.1109/ICECS58634.2023.10382899
4.
Driemeyer, B.; Kässer, P.; Ortmanns, M.
Optimum Position of Digital DAC Error Correction relative to the Decimation Filter in ΔΣ ADCs
30th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Istanbul, Turkiye
December 2023
DOI:10.1109/ICECS58634.2023.10382885
3.
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
DOI:10.1109/TCSI.2023.3310655
2.
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
DOI:10.1109/ISCAS46773.2023.10182215

2021

1.
Conrad, J.; Jiang, B.; Kässer, P.; Belagiannis, V.; Ortmanns, M.
Nonlinearity Modeling for Mixed-Signal Inference Accelerators in Training Frameworks
28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS), pp. 1-4
2021
DOI:10.1109/ICECS53924.2021.9665503

Research Assistent

Paul Kässer