Contact
Room: 43.2.252
Tel.: +49 (0)731 50 26216
omar.ismail(at)uni-ulm.de
M.Sc. Omar Ismail
Omar Ismail received his B.Sc degree in Electronics Engineering from the German University of Cairo (GUC), Egypt, 2019. Afterwards, he graduated from the "Communications Technology" master program in 2021 at Ulm University, Germany, where he completed his master project on Dual-Quantization Sigma-Delta ADCs at the Institute of Microelectronics.
Since November 2021, he is working there towards his PhD in the field of high-resolution Incremental Sigma-Delta A/D converters under the supervision of Prof. Dr.-Ing. Maurits Ortmanns.
Student theses
[mt] = Master theses, [rp] = Bachelor theses
Publications
2025
15.
P. Kässer,
O. Ismail,
J. Becker and
M. Ortmanns,
"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 |
14.
P. Kässer,
O. Ismail,
J. Becker and
M. Ortmanns,
"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 |
13.
O. Ismail,
P. Kässer,
M. Sporer,
J. G. Kauffman and
M. Ortmanns,
"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 |
12.
M. Dalla Longa,
F. Conzatti,
O. Ismail,
A. Abdelaal,
J. G. Kauffman and
M. Ortmanns,
"A 470-μW, 102.6-dB DR, 20-kHz BW Calibration-Free ΔΣ Modulator With SFDR in Excess of 110 dBc Using an Intrinsically Linear 13-Level DAC",
IEEE Journal of Solid-State Circuits ( Early Access ), Page(s): 1 - 0,
Apr.
2025.
| DOI: | 10.1109/JSSC.2025.3553310 |
11.
O. Ismail,
P. Kässer and
M. Ortmanns,
"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,
Apr.
2025.
| DOI: | 10.1109/CICC63670.2025.10983744 |
2024
10.
M. Dalla Longa,
F. Conzatti,
O. Ismail,
J. G. Kauffman and
M. Ortmanns,
"A 470μW, 102.6dB-DR, 20kHz BW Calibration-Free ΔΣ Modulator with SFDR in Excess of 110dBc using an Intrinsically Linear 13-Level DAC",
IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits), Honolulu, HI, USA, 2024, pp. 1-2,
Jun.
2024.
| DOI: | 10.1109/VLSITechnologyandCir46783.2024.10631405 |
9.
P. Kässer,
O. Ismail,
D. -. Wiens and
M. Ortmanns,
"Offset Cancellation in Incremental ∆Σ ADCs",
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore,
May
2024.
| DOI: | 10.1109/ISCAS58744.2024.10557952 |
8.
P. Kässer,
S. Kaltenstadler,
J. Conrad,
J. Wagner,
O. Ismail and
M. Ortmanns,
"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 |
7.
P. Kässer,
J. Wagner,
O. Ismail and
M. Ortmanns,
"Inner Transfer Functions in Incremental ΔΣ ADCs",
IEEE Transactions on Circuits and Systems II: Express Briefs,
Apr.
2024.
| DOI: | 10.1109/TCSII.2024.3390397 |
6.
O. Ismail,
P. Kässer,
J. G. Kauffman and
M. Ortmanns,
"Non-Ideal Reset in Incremental Delta-Sigma ADCs",
IEEE 22nd Interregional NEWCAS Conference Sherbrooke, Quebec, Canada,
Apr.
2024.
5.
O. Ismail,
P. Kässer,
J. G. Kauffman and
M. Ortmanns,
"DAC Element Mismatch Shaping Algorithms in Incremental Delta-Sigma ADCs",
IEEE International Symposium on Circuits and Systems (ISCAS), Singapore,
Jan.
2024.
| DOI: | 10.1109/ISCAS58744.2024.10558337 |
2023
4.
P. Kässer,
J. Wagner,
O. Ismail,
B. Driemeyer and
M. Ortmanns,
"Quantizer Gain in Incremental Delta-Sigma ADCs",
30th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Istanbul, Turkiye, pp. 1-4,
Dec.
2023.
| DOI: | 10.1109/ICECS58634.2023.10382904 |
3.
P. Kässer,
O. Ismail,
J. Wagner,
R. Fischer and
M. Ortmanns,
"Frequency-Domain Analysis of Reconfigured Incremental ΔΣ ADCs on the Example of the Exponential Phase",
IEEE Transactions on Circuits and Systems I: Regular Papers,
Sep.
2023.
| DOI: | 10.1109/TCSI.2023.3310655 |
2.
M. A. Mokhtar,
O. Ismail,
P. Vogelmann,
J. G. Kauffman and
M. Ortmanns,
"A 40 kS/sCalibration-Free Incremental △Σ ADC Achieving 104 dB DR and 105.7 dB SFDR",
ESSCIRC 2023- IEEE 49th European Solid State Circuits Conference (ESSCIRC), Lisbon, Portugal, pp. 401-404,
Sep.
2023.
| DOI: | 10.1109/ESSCIRC59616.2023.10268735 |
1.
P. Kässer,
O. Ismail,
C. Rudorf,
J. Wagner and
M. Ortmanns,
"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 |
Research Assistent
