Institute of Microelectronics

M.Sc. Ahmed Abdelaal

Ahmed Abdelaal received the B.​Sc degree in Electronics Engineering from the German University in Cairo (GUC), Egypt, 2016. Afterwards, he received the M.Sc degree in 2018 from Ulm University, Germany, where he is currently working towards his PhD under the supervision of Professor Dr.-Ing. Maurits Ortmanns. His research interest is high-speed continuous-time sigma-delta modulators.

Projects

Ultra-low Power, Wide Bandwidth Continuous-time Delta Sigma Analog to Digital Converter Design

A. Abdelaal, M. Pietzko: Continuous-time delta sigma modulators (CTDSMs) have recently become the key device for broadband wireless and wireline communication.  Due to their built in anti-aliasing filter and the ability to have relaxed sampling requirements the CTDS modulators are preferred over their discrete time counterparts ... [more]

Studentische Arbeiten

[mt] = Masterarbeit, [rp] = Bachelorarbeit

Aktuelle Arbeiten

Abgeschlossene Arbeiten

  • Santiago Noriega-Alvarez
    Negative-Resistance Assisted Amplifier [mt]
  • Fouad Elbadry
    Automated Opamp design using Cadence-Virtuoso Optimization Tool [rp]
  • Omar Ismail
    Dual quantization CT-Sigma-Delta ADC for wide-band applications [mt]

Publications

2022

7.
Mokhtar, M. A.; Abdelaal, A.; Sporer, M.; Becker, J.; Kauffman, J. G.; Ortmanns, M.
A 0.9-V DAC-Calibration-Free Continuous-Time Incremental Delta-Sigma Modulator Achieving 97-dB SFDR at 2 MS/s in 28-nm CMOS
IEEE Journal of Solid-State Circuits, Volume: 57, Issue: 11
November 2022
DOI:10.1109/JSSC.2022.3160325

2021

6.
Abdelaal, A.; Pietzko, M.; Mokhtar, M. A.; Kauffman, J. G.; Ortmanns, M.
FIR filter with Symmetric Non-Equal Coefficients for CT Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea (Online)
May 2021
5.
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
4.
Mokhtar, M. A.; Abdelaal, A.; Sporer, M.; Becker, J.; Kauffman, J. G.; Ortmanns, M.
A 0.9-V Calibration-Free 97dB-SFDR 2-MS/s Continuous­Time Incremental Delta-Sigma ADC Utilizing Variable Bit-Width Quantizer in 28nm CMOS
IEEE Custom Integrated Circuits Conference (CICC), Texas, USA (Virtual)
April 2021

2020

3.
Abdelaal, A.; Kauffman, J. G.; Mokhtar, M. A.; Ortmanns, M.
A Comparative Study of ISI Errors in Different DAC Structures for CT Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain
October 2020
2.
Mokhtar, M. A.; Vogelmann, P.; Abdelaal, A.; Kauffman, J. G.; Ortmanns, M.
FIR DACs in CT Incremental Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain
October 2020

2019

1.
Jain, A.; Abdelaal, A.; Ortmanns, M.
Effective Filtering of Requantization Error in Dual Quantized CTDSM using FIR DAC
IEEE International Symposium on Circuits and Systems (ISCAS), Sapporo, Japan, pp. 1-5.
May 2019

Research assistant

Ahmed Abdelaal