Institute of Microelectronics

Publications - Prof. Dr.-Ing. M. Ortmanns

Papers  Books  Patents 

Papers

2025

429.
R. Asthana, J. Conrad, M. Ortmanns and V. Belagiannis, "Dextr: Zero-Shot Neural Architecture Search with Singular Value Decomposition and Extrinsic Curvature", Aug. 2025.
DOI:10.48550/arXiv.2508.12977
428.
X. Qin, Y. Jin, M. Guo, G. Wang, S. -. Sin, M. Ortmanns, Y. Lian and L. Qi, "Analysis and Design of a Pipelined MASH Continuous-Time Delta-Sigma Modulator With 15.4 MHz-BW and 82.6 dB-SNDR", IEEE Transactions on Circuits and Systems I: Regular Papers ( Early Access ), Aug. 2025.
DOI:10.1109/TCSI.2025.3596608
427.
M. Sporer, D. Fritschi, N. Graber, S. Reich and M. Ortmanns, "A Wireless Headstage Based on a 32-Channel Neuromodulator Integrated Circuit", IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, May 2025.
DOI:10.1109/ISCAS56072.2025.11043699
426.
J. Conrad, S. Wilhelmstätter, H. Mandry, P. Kässer, A. Abdelaal, R. Asthana, V. Belagiannis and M. Ortmanns, "PSumSim: A Simulator for Partial-Sum Quantization in Analog Matrix-Vector Multipliers", IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, May 2025.
DOI:10.1109/ISCAS56072.2025.11043442
425.
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
424.
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
423.
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
422.
J. Conrad, S. Wilhelmstätter, H. Mandry, P. Kässer, A. Abdelaal, R. Asthana, V. Belagiannis and M. Ortmanns, "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
421.
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
420.
D. -. Wiens, A. Abdelaal, B. Driemeyer, J. Becker, J. G. Kauffman and M. Ortmanns, "A Direct Digitizing, 1MHz Bandwidth, 28fA/√Hz Current Sensing Front-End Based on a Mixed-Signal Integrator-Differentiator TIA in 28nm CMOS", IEEE Custom Integrated Circuits Conference (CICC), Boston, MA, USA, Apr. 2025.
DOI:10.1109/CICC63670.2025.10983397
419.
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
418.
B. Driemeyer, H. Mandry, D. -. Wiens, J. Becker, J. G. Kauffman and M. Ortmanns, "17.5 An Eye-Opening Arbiter PUF for Fingerprint Generation Using Auto-Error Detection for PVT-Robust Masking and Bit Stabilization Achieving a BER of 2e-8 in 28nm CMOS", IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, USA, Feb. 2025.
417.
M. Mayer, S. Reich, H. Mandry and M. Ortmanns, "A Rapid-Prototyping Platform for Active Stents Utilizing Device Decapsulation for Miniaturization", 31st IEEE International Conference on Electronics, Circuits and Systems (ICECS), Jan. 2025.
DOI:10.1109/ICECS61496.2024.10848908
416.
H. Mandry, B. Driemeyer, J. Becker and M. Ortmanns, "Investigation of the Influence of Multi-Valued Symbol Extraction on PUF Randomness", 31st IEEE International Conference on Electronics, Circuits and Systems (ICECS), Jan. 2025.
DOI:10.1109/ICECS61496.2024.10849251
415.
M. Aziz, P. Kässer, S. Ibrahim and M. Ortmanns, "A Comparative Study of Incremental ΔΣ Analog-to-Digital Converter Architectures with Extended Order and Resolution", MDPI Electronics 2025, 14, 372, Jan. 2025.
DOI:10.3390/electronics14020372
414.
H. Mandry, J. Ruchti, J. Nowakowski, M. Pehl and M. Ortmanns, "Protection of Oscillator-Based PUFs against Side Channel Analyses by Random Interruption", IACR Transactions on Cryptographic Hardware and Embedded Systems, Vol. 2025 No. 2, 460-488, 2025.
DOI:10.46586/tches.v2025.i2.460-488

2024

413.
M. Sporer, N. Graber, M. Mayer, S. Reich, T. Stieglitz and M. Ortmanns, "An ultra-miniaturized Neural Recording μASIC for the NeuroBus Implant", IEEE Biomedical Circuits and Systems Conference (BioCAS), Xi'an, China, pp. 1-5, Dec. 2024.
DOI:10.1109/BioCAS61083.2024.10798303
412.
J. Conrad, S. Wilhelmstätter, R. Asthana, V. Belagiannis and M. Ortmanns, "Differentiable Cost Model for Neural-Network Accelerator Regarding Memory Hierarchy", IEEE Transactions on Circuits and Systems I: Regular Papers ( Early Access ), Oct. 2024.
DOI:10.1109/TCSI.2024.3476534
411.
J. Conrad, J. G. Kauffman, S. Wilhelmstätter, R. Asthana, V. Belagiannis and M. Ortmanns, "Confidence Estimation and Boosting for Dynamic-Comparator Transient-Noise Analysis", 22nd IEEE Interregional NEWCAS Conference (NEWCAS), Sep. 2024.
DOI:10.1109/NewCAS58973.2024.10666354
410.
A. Abdelaal, M. Pietzko, J. G. Kauffman, A. Jain and M. Ortmanns, "ΔΣ Modulators Employing MASH DSM DAC-Based Dual Quantization", IEEE Transactions on Circuits and Systems I: Regular Papers ( Volume: 72, Issue: 1, Page(s) 71-84, January 2025), Aug. 2024.
DOI:10.1109/TCSI.2024.3448224
409.
A. Abdelaal, M. Pietzko, J. Ungethüm, J. G. Kauffman and M. Ortmanns, "Using Negative-R Assisted Integrators in Wide-band Delta-Sigma Modulators", IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, Jul. 2024.
DOI:10.1109/ISCAS58744.2024.10558442
408.
S. Wilhelmstätter, J. Conrad, D. Upadhyaya, I. Polian and M. Ortmanns, "Enabling Power Side-Channel Attack Simulation on Mixed-Signal Neural Network Accelerators", IEEE International Conference on Omni-Layer Intelligent Systems (COINS), London, UK, Jul. 2024.
407.
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
406.
D. -. Wiens, B. Driemeyer and M. Ortmanns, "A Mixed-Signal TIA with Input Restoring ADC", IEEE International Symposium on Circuits and Systems (ISCAS), Singapore, May 2024.
DOI:10.1109/ISCAS58744.2024.10557979
405.
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

Books

2025

10.
Buhmann, A.; Lanniel, A.; Hiller, T.; Sporer, M.; Reich, S.; Ortmanns, M.
Interface Circuits
Publisher: Ed. Elsevier
in Comprehensive Microsystems, 2nd ed., Y. B. Gianchandani, Volume 1, 2025, pp. 452–479 Edition
2025
DOI:10.1016/B978-0-323-95478-5.00040-6

2023

9.
Chan, C.-H.; Zhu, Y.; Qi, L.; Sin, S.-W.; Ortmanns, M.; Martins, R. P.
High-Performance Oversampling ADCs
Paulo da Silva Martins, R., Mak, PI. (eds) Analog and Mixed-Signal Circuits in Nanoscale CMOS. Analog Circuits and Signal Processing. Springer, Cham. Edition
January 2023
DOI:doi.org/10.1007/978-3-031-22231-3_5

2021

8.
Haas, M.; Ortmanns, M.
Neural Stimulation Circuits
Publisher: River Publishers
Selected Topics in Biomedical Circuits and Systems, Eds Minkyu Je and Myung Hoon Sunwoo Edition
February 2021
ISBN:9788770221481

2019

7.
Vogelmann, P.; Mokhtar, M. A.; Luo, Y.; Ortmanns, M.
Next-Generation ADCs, High-Performance Power Management, and Technology Considerations for Advanced Integrated Circuits: Advances in Analog Circuit Design 2019
Publisher: Springer
2019
ISBN:978-3030252663

2016

6.
Ortmanns, M.; Ritter, R.; Chi, J.
ΣΔ ADCs with Improved Interferer Robustness
Volume Wideband Continuous-time SD-ADCs, Automotive Electronics, and Power Management: Advances in Analog Circuit Design 2016
Publisher: Springer
2016
ISBN:978-3319416694

2014

5.
Brückner, T.; Ortmanns, M.
Automated Design of High-Speed Continuous-Time Sigma-Delta Modulators employing Compensation and Correction of Non-Idealities, in High-Performance AD and DA Converters, IC Design in Scaled Technologies, and Time-Domain Signal Processing
Publisher: Springer
2014

2007

4.
Ortmanns, M.; Buhmann, A.; Manoli, Y.
Interface Circuits in Comprehensive Microsystems
Publisher: Elsevier Pubs.
2007

2006

3.
Buhmann, A.; Keller, M.; Ortmanns, M.; Gerfers, F.; Manoli, Y.
Time-Continuous Delta-Sigma A/D Converters - From Theory to Practical Implementation
Publisher: in Advanced Signal Processing, Circuits, and Systems Design Techniques for Communications, (eds. Paliouras, V.; Stouraitis, Th.; Ioinovici, A.)
2006

2005

2.
Ortmanns, M.; Gerfers, F.
Continuous-Time Sigma-Delta A/D Conversion, Fundamentals, Error Correction and Robust Implementations
Publisher: Springer Pubs.
2005

2003

1.
Ortmanns, M.
Error Compensation in Continuous-Time Sigma-Delta A/D Converters
Publisher: PhD Thesis, Albert-Ludwigs-University Freiburg
2003

Patents

  1. A. Herkle, J. Becker, M. Ortmanns
    [DE] Verfahren und Vorrichtung zur Erzeugung einer digitalen Signatur
    DE102016204055A1, Patent record available from the German Patent
    2016

  2. R. Ritter, M. Schimper, W. Schelmbauer, M. Ortmanns
    Analog-to-digital converter, signal processor, and method for analog-to-digital conversion.
    US8760330, Patent record available from the US Patent Office
    2014

  3. A. Rocke, M. Ortmanns und N. Unger
    Device for controlling the electric charge on stimulation electrodes.
    EP1827591, Patent record available from the European Patent
    2007

  4. M. Ortmanns, Y. Manoli und F. Gerfers
    Controlled power source, in particular for a digital/analogue converter in continuous time sigma/delta modulators.
    EP1550222, Patent record available from the European Patent
    2005

  5. A. Rocke, M. Ortmanns und N. Unger
    Device for controlling the electric charge on stimulation electrodes.
    WO06063743, Patent record available from the World Intellectual Property Organization (WIPO)
    2006

  6. M. Ortmanns und Y. Manoli
    Method for the characterisation of and for the automatic correction of linear errors in analog/digital converters.
    WO05078936, Patent record available from the World Intellectual Property Organization (WIPO)
    2005

  7. M. Ortmanns, Y. Manoli und F. Gerfers
    Controlled power source, in particular for a digital/analogue converter in continuous time sigma/delta modulators.
    WO04034588, Patent record available from the World Intellectual Property Organization (WIPO)
    2004

  8. M. Ortmanns, Y. Manoli und F. Gerfers
    Controlled current source, in particular for digital/analogue converters in continuous-time sigma/delta modulators.
    US7151474, Patent record available from the US Patent Office
    2006

  9. M. Ortmanns, Y. Manoli und F. Gerfers
    Controlled power source, in particular for a digital/analogue converter in continuous time sigma delta modulators.
    US20060055580, Patent record available from the US Patent Office
    2006