Institute of Microelectronics

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

Papers  Books  Patents 

Papers

2007

54.
M. Ortmanns, M. Gehrke and H. -. Tiedtke, " A Stimulator ASIC for a 232 Channel Retinal Implant", 41. Jahrestagung der Deutschen Gesellschaft für Biomedizinische Technik, Aachen, 2007.
53.
M. Ortmanns, " Charge Balancing in Functional Electrical Stimulators: a Comparative Study", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
52.
S. Saleh, M. Ortmanns and Y. Manoli, "A Comparative Study of CMOS LNAs in proc", IEEE European Conference on Circuits Theory and Design, ECCTD, pp.76-79, 2007.
51.
F. Henrici, J. Becker, A. Buhmann, M. Ortmanns and Y. Manoli, "A Continuous-Time Field Programmable Analog Array Using Parasitic Capacitance Gm-C Filters", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
50.
M. Keller, A. Buhmann, M. Ortmanns and Y. Manoli, "A Method for the Discrete-Time Simulation of Continuous-Time Sigma-Delta Modulators", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
49.
N. Lotze, M. Ortmanns and Y. Manoli, "A Study on Self-Timed Asynchronous Subthreshold Logic", IEEE International Conf. on Computer Design (ICCD), Washington, DC, USA, 2007.
48.
D. Maurath, C. Peters, M. Ortmanns and Y. Manoli, "Adaptive Power Extraction from Micro Generators with Implicit Voltage Up-Conversion", PowerMEMS, pp. 281-284, Freiburg, Germany, 2007.
47.
C. Peters, O. Kessling, F. Henrici, M. Ortmanns and Y. Manoli, "CMOS Integrated Highly Efficient Full Wave Rectifier", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
46.
J. Anders, W. Mathis and M. Ortmanns, "Entwurf von zeitkontinuierlichen Sigma-Delta Modulatoren - Äquivalenz zwischen zeitkontinuierlichen und zeitdiskreten Systemen", Advances in Radio Science 5, pp. 221-224, 2007.
45.
A. Buhmann, M. Keller, M. Ortmanns and Y. Manoli, "Estimating Circuit Nonidealities of Continuous-Time Multibit Delta-Sigma Modulators", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
44.
D. Maurath, C. Peters, M. Ortmanns and Y. Manoli, "Hocheffiziente integrierte Gleichrichterschaltungen und Spannungsverstärker für Energy Harvesting Anwendungen", Advances in Radio Science Vol. 6 (Kleinheubacher Berichte), Miltenberg, Germany, 2007.
43.
C. Peters, M. Ortmanns and Y. Manoli, "Low Power High Performance Voltage Rectifier for Autonomous Microsystems", PowerMEMS, Freiburg, Germany, 2007.
42.
M. Keller, A. Buhmann, M. Ortmanns and Y. Manoli, "On the implicit anti-aliasing feature in continuous-time sigma-delta Modulators", IEEE Trans. on Circuits and Systems I, Vol.54, No.12, pp. 2639-2645, 2007.
41.
M. Keller, A. Buhmann, M. Ortmanns and Y. Manoli, "On the Implicit Anti-Aliasing Feature of Continuous-Time Multistage Noise-Shaping Sigma-Delta Modulators", IEEE Int. Symp. on Circuits and Systems (ISCAS), New Orleans, USA, 2007.
40.
N. Lotze, M. Ortmanns and Y. Manoli, "Untersuchung von asynchronen Timing-Strategien für digitale Subthreshold-Schaltungen", Advances in Radio Science Vol. 6 (Kleinheubacher Berichte), Miltenberg, Germany, 2007.

2006

39.
M. Ortmanns, N. Unger, A. Rocke, M. Gehrke and H. -. Tiedtke, " A 0.1mm², digitally programmable stimulation pad cell for a retinal implant with high-voltage capability", IEEE Int. Conf. on Solid State Circuits (ISSCC), San Francisco, USA, 2006.
38.
M. Ortmanns, N. Unger, A. Rocke, M. Gehrke and H. -. Tiedtke, " A Retina Stimulator ASIC with 232 Electrodes, Custom ESD Protection and Active Charge Balancing", IEEE Int. Symp. on Circuits and Systems (ISCAS), Kos Island, Greece, 2006.
37.
M. Ortmanns, " Modellierung und Simulation zeitkontinuierlicher Sigma-Delta A/D Umsetzer", Advances in Radio Science Vol. 5 (Kleinheubacher Berichte), Miltenberg, Germany, 2006.
36.
F. Gerfers, M. Ortmanns and P. Schmitz, "A Transistor-based Clock Jitter Insensitive DAC Architecture", IEEE Int. Symp. on Circuits and Systems (ISCAS), Kos Island, Greece, 2006.
35.
J. Anders, W. Mathis and M. Ortmanns, "Direkter Entwurf von zeitkontinuierlichen Sigma-Delta-Modulatoren - Optimale Rauschformung und erweiterte Stabilitätsbetrachtungen", Kleinheubacher Tagung, 2006.
34.
M. Becker, N. Lotze, M. Ortmanns and Y. Manoli, "Implementation and Analysis of Power Consumption for a Power Optimized Decimator Designed for Cascaded Sigma-Delta A/D Converters", IEEE International Midwest Symposium on Circuits and Systems, 2006. MWSCAS 2006, San Juan, Puerto Rico, 2006.

2005

33.
M. Ortmanns, F. Gerfers and Y. Manoli, " A Case Study On A 2-1-1 Cascaded Continuous-Time Sigma-Delta Modulator", IEEE Trans. on Circuits and Systems I, Vol.52, No.8, pp. 1515-1525, 2005.
32.
M. Ortmanns, F. Gerfers and Y. Manoli, " A Continuous-Time Sigma-Delta Modulator with Reduced Sensitivity to Clock Jitter through SCR-feedback", IEEE Trans. on Circuits and Systems I, Vol.52, No.5, pp. 875-884, 2005.
31.
M. Ortmanns, F. Gerfers and Y. Manoli, " Increased Jitter Sensitivity in Continuous- and Discrete-Time Sigma-Delta Modulators due to finite OpAmp Settling Speed", IEEE Int. Symp. on Circuits and Systems (ISCAS), Kobe, Japan, 2005.

2004

30.
M. Ortmanns, F. Gerfers, M. Kuderer and Y. Manoli, " A Cascaded Continuous-Time Sigma-Delta Modulator with 80 dB Dynamic Range", IEEE Int. Symp. on Circuits and Systems (ISCAS), Vancouver, Canada, 2004.

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