Staff

Dr.-Ing. Frank Ohnhäuser

About Frank Ohnhäuser

Dr.-Ing. Frank Ohnhäuser teaches  the Analog-Digital and Digital-Analog Converters class at the Friedrich-Alexander University of Erlangen-Nuremberg.

He started his career in analog IC development after finishing his studies in Electrical Engineering at the Friedrich-Alexander University of Erlangen-Nuremberg in 1996. At Burr-Brown/Texas Instruments (Tucson, USA), he developed high precision ADCs, and founded and led a development center in Erlangen beginning in 1999 where he was a Senior Member of Technical Staff. He was responsible for product definition of ADCs in the field of industrial applications and IC design and layout as well as the verification, characterization, qualification, and production test of the team’s products. The success was based on customer satisfaction and technical application focus. He currently holds nine patents, has four patent applications, and is author of numerous scientifically recognized publications.

Lectures Summer term 2019

  • Analog-Digital- and Digital-Analog-Converters

Lectures Winter term 2019

  • Analog IC Signal Conditioning

Publications

2017

  • R. Löhr, L. Bender, J. Röber, F. Ohnhäuser, and R. Weigel, "Analysis of the Settling Behavior of an External Reference Voltage Source for a 16 Bit and 200 MS/s Pipeline Analog-to-Digital Converter" in 24th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Batumi, Georgien, Georgia, 2017. [Bibtex]
    @inproceedings{loehr2017a,
    abstract = {
    High-Performance Analog to Digital Converter (ADC) have high requirements concerning the reference voltage source. In a small period of time the reference voltage has to settle with a high accuracy. Otherwise the linearity of the ADC degrades. In this paper the settling of an external reference voltage source is examined. Therefore optimization techniques for the signal path of the reference voltage are presented. This includes methods for reducing the external parasitic inductanceas well as design techniques for an enhanced settling curve. Under typical conditions, the achieved reference voltage source settles with an accuracy of 15 uV in less than halve a clock cycle for a 200 MS/s and 16 bits Pipeline ADC.
    }, author = {Löhr, Robert and Bender, Leon and Röber, Jürgen and Ohnhäuser, Frank and Weigel, Robert}, language = {English}, booktitle = {24th IEEE International Conference on Electronics, Circuits and Systems (ICECS)}, cris = {https://cris.fau.de/converis/publicweb/publication/119647484}, year = {2017}, month = {12}, day = {08}, eventdate = {2017-12-04/2017-12-08}, faupublication = {yes}, keywords = {reference voltage; settling; Pipeline ADC; external parasitic inductance; attenuation}, peerreviewed = {unknown}, title = {Analysis of the Settling Behavior of an External Reference Voltage Source for a 16 Bit and 200 MS/s Pipeline Analog-to-Digital Converter}, type = {Konferenzschrift}, venue = {Batumi, Georgien, Georgia}, }
  • R. Löhr, M. Stadelmayer, J. Röber, F. Ohnhäuser, and R. Weigel, "A Combination of a Digital Foreground and Background Calibration for a 16Bit and 200MS/s Pipeline Analog-to-Digital Converter" in ECCTD, Italien, 2017. [Bibtex]
    @inproceedings{loehr2017,
    abstract = {
    High-Performance Analog-to-Digital Converter
    (ADC) have high requirements concerning sampling rate and
    linearity. Therefore a new formula is derived to determine,
    which pipeline stage dependent on the used capacitor sizes
    needs to be calibrated for the targeted linearity. Furthermore,
    a model of a 16 bit and 200MS/s pipeline ADC is described. A
    combination of a digital foreground and a digital background
    calibration is presented, which can compensate linear errors
    and achieves a DNL smaller than ±1 and a THD of -88 dB.
    }, author = {Löhr, Robert and Stadelmayer, Markus and Röber, Jürgen and Ohnhäuser, Frank and Weigel, Robert}, language = {English}, publisher = {IEEE}, booktitle = {ECCTD}, cris = {https://cris.fau.de/converis/publicweb/publication/106860204}, year = {2017}, month = {07}, faupublication = {yes}, keywords = {Pipeline ADC,modeling,common mode jump,capacitor-flip-over architecture,digital calibration,foreground,background,high resolution.}, peerreviewed = {unknown}, title = {A Combination of a Digital Foreground and Background Calibration for a 16Bit and 200MS/s Pipeline Analog-to-Digital Converter}, venue = {Italien}, }

2016

  • R. Löhr, F. Ohnhäuser, J. Röber, and R. Weigel, "Switch Bootstrapping in a 1.5 Bit Pipeline Stage" in Analog2016, Bremen, 2016, pp. 49-52. [Bibtex]
    @inproceedings{loehr2016,
    abstract = {The targeted 16 bit pipeline converter has an adjustable sampling frequency from 100MHz to 200MHz. In this paper the switches for the input and the reference voltage sampling are analyzed. Therefore, a novel switch bootstrapping technique is presented, which guarantees a worst case input voltage settling accuracy of LSB 2 at settling times between 2 ns to 5 ns. The non-linearity caused by the input switches is simulated and typically amounts to -115 dB. In addition a possible solution for external reference voltage settling is introduced.},
    author = {Löhr, Robert and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert},
    booktitle = {Analog2016},
    cris = {https://cris.fau.de/converis/publicweb/publication/122835064},
    year = {2016},
    eventtitle = {Analog2016},
    faupublication = {yes},
    keywords = {1.5 bit,switch bootstrapping,MDAC,charge injection,external reference,non-linearity},
    pages = {49--52},
    peerreviewed = {Yes},
    title = {Switch Bootstrapping in a 1.5 Bit Pipeline Stage},
    venue = {Bremen},
    }

2015

  • R. Löhr, M. Kempf, F. Ohnhäuser, J. Röber, R. Weigel, and A. Bänisch, "Implementation of a High-Speed Flash ADC for High Performance Pipeline ADCs in an 180nm CMOS Process" in International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), Nusa Dua, Bali, 2015. [DOI] [Bibtex]
    @inproceedings{loehr2015,
    abstract = {Pipeline Analog to Digital Converters (ADC) use a sub-ADC in each pipeline stage. They require a much higher sampling rate and less accuracy. For that reason Flash ADCs are predestined for sub-ADCs. In this paper a differential Flash ADC is presented for a targeted pipeline ADC with 16 Bit, 200 MS/s and a 1.5 Bit resolution per stage. The overall accuracy of the Flash ADC is 30mV and a typical propagation delay of around 400 ps is achieved. This corresponds to a sampling rate of 2.5 GS/s. In addition, a new numerical method for an effective simulation of the propagation delay and offset is presented.},
    author = {Löhr, Robert and Kempf, Markus and Ohnhäuser, Frank and Röber, Jürgen and Weigel, Robert and Bänisch, Andreas},
    booktitle = {International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    cris = {https://cris.fau.de/converis/publicweb/publication/120749684},
    year = {2015},
    month = {11},
    doi = {10.1109/ISPACS.2015.7432788},
    eventtitle = {International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Implementation of a High-Speed Flash ADC for High Performance Pipeline ADCs in an 180nm CMOS Process},
    venue = {Nusa Dua, Bali},
    }

2012

  • J. Bialek, F. Ohnhäuser, A. Wickmann, G. Fischer, and R. Weigel, "Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer" in Kleinheubacher Tagung, Kleinheubach, DE, 2012. [Bibtex]
    @inproceedings{bialek2012,
    author = {Bialek, Jan and Ohnhäuser, Frank and Wickmann, Andreas and Fischer, Georg and Weigel, Robert},
    booktitle = {Kleinheubacher Tagung},
    cris = {https://cris.fau.de/converis/publicweb/publication/123799104},
    year = {2012},
    month = {09},
    faupublication = {yes},
    peerreviewed = {unknown},
    title = {Ein digitales Abgleichverfahren fuer SAR Analog-Digital-Umsetzer},
    venue = {Kleinheubach, DE},
    }

2008

  • F. Ohnhäuser, "Theory and Realization of High-end Analog-to-Digital Converters based on the Principle of Successive Approximation", 2008. [Bibtex]
    @phdthesis{ohnhaeuser2008b,
    author = {Ohnhäuser, Frank},
    institution = {FAU Erlangen-Nürnberg},
    cris = {https://cris.fau.de/converis/publicweb/publication/112429504},
    year = {2008},
    month = {07},
    entrysubtype = {Dissertation},
    faupublication = {yes},
    peerreviewed = {automatic},
    title = {Theory and Realization of High-end Analog-to-Digital Converters based on the Principle of Successive Approximation},
    type = {Dissertation},
    }
  • F. Ohnhäuser and M. Huemer, "Methods to Eliminate Dynamic Errors in High-Performance SAR A/D Converter" in IEEE International Symposium on Circuits and Systems, 2008, pp. 2398-2401. [Bibtex]
    @inproceedings{ohnhaeuser2008a,
    author = {Ohnhäuser, Frank and Huemer, Mario},
    booktitle = {IEEE International Symposium on Circuits and Systems},
    cris = {https://cris.fau.de/converis/publicweb/publication/122016444},
    year = {2008},
    month = {05},
    faupublication = {yes},
    pages = {2398--2401},
    peerreviewed = {unknown},
    title = {Methods to Eliminate Dynamic Errors in High-Performance SAR A/D Converter},
    }
  • F. Ohnhäuser and M. Huemer, "History and outlook for high voltage and high performance SAR A/D converter", Elektrotechnik und Informationstechnik, iss. 4, pp. 17-20, 2008. [Bibtex]
    @article{ohnhaeuser2008,
    author = {Ohnhäuser, Frank and Huemer, Mario},
    publisher = {Springer-Verlag},
    cris = {https://cris.fau.de/converis/publicweb/publication/107639884},
    year = {2008},
    month = {04},
    faupublication = {yes},
    issn = {0932-383X},
    journaltitle = {Elektrotechnik und Informationstechnik},
    number = {4},
    pages = {17--20},
    peerreviewed = {Yes},
    title = {History and outlook for high voltage and high performance SAR A/D converter},
    }

2007

  • F. Ohnhäuser and M. Huemer, "Reference Generation for A/D Converters" in International Symposium on Signals, Systems and Electronics, Montreal, Canada, 2007, pp. 355-358. [DOI] [Bibtex]
    @inproceedings{ohnhaeuser2007,
    abstract = {An analog-to-digital converter (ADC) compares the input voltage Vin with a reference voltage REF to convert it into a digital word. The reference source must be able to drive the ADCs reference input; it needs to provide low noise, should be adjustable, stable over temperature and supply voltage and should not require external components. A novel scheme was developed and implemented in a 12bit 2MSPS SAR converter.},
    author = {Ohnhäuser, Frank and Huemer, Mario},
    booktitle = {International Symposium on Signals, Systems and Electronics},
    cris = {https://cris.fau.de/converis/publicweb/publication/107487424},
    year = {2007},
    month = {08},
    doi = {10.1109/ISSSE.2007.4294486},
    faupublication = {yes},
    pages = {355--358},
    peerreviewed = {unknown},
    title = {Reference Generation for A/D Converters},
    venue = {Montreal, Canada},
    }

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