Staff

M. Sc. Tim Maiwald

Contact

  • Mail:
  • Phone: 09131/85-27195
  • Fax: 09131/85-28730
  • Cauerstraße 9
    91058 Erlangen

About Tim Maiwald

Areas of Interest

  • RF Chipdesign
  • RF System Engineering

Open thesis projetcs

Just call me!

Awards

  • T. Ackermann, J. Potschka, and T. Maiwald, IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "Power Amplifier Linearization through Digital Predistortion (DPD)", IEEE Microwave Theory and Techniques Society (MTT-S), 2019. [Bibtex]
    @prize{ackermann_prize_2019,
    abstract = {In the area of mobile communications, Thomas Ackermann and Julian Potschka and Tim Maiwald won the Power Amplifier Linearization through Digital Pre-Distortion (DPD) competition against two other opponents. The goal of the challenge was to design an algorithm for pre-distorting a 2-channel MIMO transmitter with cross-coupling effect in order to maximize the linearity of the overall system. The system consisted of two GaN HEMT Doherty power amplifiers and a coupler to control the crosstalk between the two PAs. The team implemented a cascaded polynomial model that reduced unwanted static and dynamic effects as well as crosstalk between the two PAs, optimizing the overall performance of the system.
    }, author = {Ackermann, Thomas and Potschka, Julian and Maiwald, Tim}, booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)}, cris = {ackermann_prize_2019}, year = {2019}, month = {06}, day = {06}, title = {IEEE MTT-S International Microwave Symposium Student Design Competition First Place Award for "Power Amplifier Linearization through Digital Predistortion (DPD)"}, type = {20773-Kleiner Preis}, }
  • T. Maiwald, IMS2019 PhD Student Sponsorship, IEEE Microwave Theory and Techniques Society (MTT-S), 2019. [Bibtex]
    @prize{maiwald_prize_2019,
    author = {Maiwald, Tim},
    booktitle = {IEEE Microwave Theory and Techniques Society (MTT-S)},
    cris = {maiwald_prize_2019},
    year = {2019},
    title = {IMS2019 PhD Student Sponsorship},
    type = {20773-Kleiner Preis},
    }

COPYRIGHT NOTICE: Copyright and all rights of the material above are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by the appropriate copyright. The material may not be reposted without the explicit permission of the copyright holder.

COPYRIGHT NOTICE FOR IEEE PUBLICATIONS: © IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

COPYRIGHT NOTICE FOR EUMA PUBLICATIONS: © EUMA. Personal use of this material is permitted. Permission from European Microwave Association(EUMA) must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Publications

2020

  • J. Potschka, M. Dietz, K. Kolb, T. Maiwald, D. Ferling, A. Hagelauer, and R. Weigel, "A Tuneable Fully Single-Ended 39 GHz to 28 GHz Gilbert Micromixer for 5G Using Analog Predistortion in a 130 nm BiCMOS Technology (to be published)" in IEEE Radio & Wireless Week (RWW), San Antonio, Texas, USA, 2020. [Bibtex]
    @inproceedings{potschka2020,
    author = {Potschka, Julian and Dietz, Marco and Kolb, Katharina and Maiwald, Tim and Ferling, Dieter and Hagelauer, Amelie and Weigel, Robert},
    language = {English},
    booktitle = {IEEE Radio & Wireless Week (RWW)},
    cris = {https://cris.fau.de/converis/publicweb/publication/227842814},
    year = {2020},
    month = {01},
    day = {26},
    eventdate = {2020-01-26/2020-01-29},
    faupublication = {yes},
    keywords = {Gilbert-Micromixer,Mixer,Reactive-Current-Combining,Tuneable-Mixer,5G},
    peerreviewed = {Yes},
    title = {A Tuneable Fully Single-Ended 39 GHz to 28 GHz Gilbert Micromixer for 5G Using Analog Predistortion in a 130 nm BiCMOS Technology (to be published)},
    type = {Konferenzschrift},
    venue = {San Antonio, Texas, USA},
    }

2019

  • A. Schrotz, T. Maiwald, K. Kolb, S. Breun, M. Dietz, A. Hagelauer, and R. Weigel, "Design Methodology for Automatically Designed, Integrated Marchand Baluns with Low Insertion Loss at Lowest Phase Imbalance" in APMC (Asia-Pacific Microwave Conference), Singapur, Singapore, 2019 (to be published). [Bibtex]
    @inproceedings{schrotz2019,
    abstract = {In this paper, a design methodology for automated Marchand balun design is shown. The goal of this methodology is a balun providing the lowest insertion loss at the smallest phase imbalance. The design process is realized by using the EM simulator Sonnet, Matlab and the Matlab-Sonnet interface. The implemented algorithm is using a simulation-based characterization of the semiconductor process and a mathematical model of the balun. For this characterization an even and odd mode analysis is carried out. Hence, the electrical and dielectric properties, such as the characteristic impedance and the effective permittivity, are determined. This enables a precise "first guess simulation" of the balun, minimizing the required number of optimization iterations. As an example, a D-band Marchand balun is presented here, that was designed with this methodology. The measurement results show a phase imbalance less than 7° over the entire D-band and an insertion loss smaller than 1.75 dB. To the best of the author's knowledge, there was no software tool that enables automated development for Marchand baluns yet, although it is widely used.
    }, author = {Schrotz, Albert-Marcel and Maiwald, Tim and Kolb, Katharina and Breun, Sascha and Dietz, Marco and Hagelauer, Amelie and Weigel, Robert}, language = {English}, booktitle = {APMC (Asia-Pacific Microwave Conference)}, cris = {https://cris.fau.de/converis/publicweb/publication/224804429}, year = {2019}, month = {12}, day = {10}, eventdate = {2019-12-10}, faupublication = {yes}, keywords = {Marchand Balun; Automatically balun Design}, note = {unpublished}, peerreviewed = {automatic}, title = {Design Methodology for Automatically Designed, Integrated Marchand Baluns with Low Insertion Loss at Lowest Phase Imbalance}, venue = {Singapur, Singapore}, }
  • J. Potschka, M. Dietz, K. Kolb, T. Maiwald, S. Breun, T. Ackermann, D. Ferling, A. Hagelauer, and R. Weigel, "A Highly Linear and Efficient 28 GHz Stacked Power Amplifier for 5G using Analog Predistortion in a 130 nm BiCMOS Process (to be published)" in IEEE Asia-Pacific Microwave Conference (APMC), Singapore, 2019. [Bibtex]
    @inproceedings{potschka2019a,
    author = {Potschka, Julian and Dietz, Marco and Kolb, Katharina and Maiwald, Tim and Breun, Sascha and Ackermann, Thomas and Ferling, Dieter and Hagelauer, Amelie and Weigel, Robert},
    language = {English},
    booktitle = {IEEE Asia-Pacific Microwave Conference (APMC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/225496208},
    year = {2019},
    month = {12},
    day = {10},
    eventdate = {2019-12-10/2019-12-13},
    faupublication = {yes},
    keywords = {Analog Predistortion; Power Amplifier; 5G},
    peerreviewed = {Yes},
    title = {A Highly Linear and Efficient 28 GHz Stacked Power Amplifier for 5G using Analog Predistortion in a 130 nm BiCMOS Process (to be published)},
    type = {Konferenzschrift},
    venue = {Singapore},
    }
  • J. Potschka, C. Söll, J. Kirchner, C. Mardin, M. Stadelmayer, T. Maiwald, S. Breun, K. Kolb, A. Bauch, M. Dietz, C. Beck, M. Völkel, A. Hagelauer, and R. Weigel, "Design of an Integrated Subretinal Implant Using Cellular Neural Networks for Binary Image Generation in a 130 nm BiCMOS Process" in IEEE Engineering in Medicine and Biology Conference (EMBC), Berlin, 2019. [Bibtex]
    @inproceedings{potschka2019,
    author = {Potschka, Julian and Söll, Christopher and Kirchner, Jens and Mardin, Christian and Stadelmayer, Markus and Maiwald, Tim and Breun, Sascha and Kolb, Katharina and Bauch, Andreas and Dietz, Marco and Beck, Christopher and Völkel, Matthias and Hagelauer, Amelie and Weigel, Robert},
    booktitle = {IEEE Engineering in Medicine and Biology Conference (EMBC)},
    cris = {https://cris.fau.de/converis/publicweb/publication/217754593},
    year = {2019},
    month = {07},
    day = {23},
    eventdate = {2019-07-23/2019-07-27},
    faupublication = {yes},
    peerreviewed = {Yes},
    title = {Design of an Integrated Subretinal Implant Using Cellular Neural Networks for Binary Image Generation in a 130 nm BiCMOS Process},
    type = {Konferenzschrift},
    venue = {Berlin},
    }

2015

  • R. Richer, T. Maiwald, C. F. Pasluosta, B. Hensel, and B. Eskofier, "Novel Human Computer Interaction Principles for Cardiac Feedback using Google Glass and Android Wear" in 2015 IEEE 12th International Conference on Wearable and Implantable Body Sensor Networks (BSN), Cambridge, MA, USA, 2015. [DOI] [Bibtex]
    @inproceedings{richer2015,
    abstract = {
    This work presents a system for unobtrusive cardiac feedback in daily life. It addresses the whole pipeline from data acquisition over data processing to data visualization including wearable integration. ECG signals are recorded with a novel ECG sensor supporting Bluetooth Low Energy, which is able to transmit raw ECG data as well as estimated heart rate. ECG signals are processed in real-time on a mobile device to automatically classify the user's heart beats. A novel application for Android-based mobile devices was developed for data visualization. It offers several modes for cardiac feedback, from measuring the current heart rate to continuously monitoring the user's heart status. It also allows to store acquired data in an internal database as well as in the Google Fit platform. Further, the application provides extensions for wearables like Google Glass and smartwatches running on Android Wear. Hardware performance evaluation was performed by comparing the course of heart rate between the novel ECG sensor and a commercial ECG sensor. The mean absolute error between the two sensors was 4.83 bpm with a standard deviation of 4.46 bpm, and a Pearson correlation of 0.922. A qualitative evaluation was performed for the Android application with special emphasis on the daily usability and the wearable integration. When the Google Glass was integrated, the subjects rated the application as 2.8/5 (0 = Bad, 5 = Excellent), whereas when the application was integrated with a smartwatch the rating increased to 4.2/5.

    ~}, author = {Richer, Robert and Maiwald, Tim and Pasluosta, Cristian Federico and Hensel, Bernhard and Eskofier, Björn}, editor = {IEEE}, language = {English}, booktitle = {2015 IEEE 12th International Conference on Wearable and Implantable Body Sensor Networks (BSN)}, cris = {https://cris.fau.de/converis/publicweb/publication/117714124}, year = {2015}, month = {06}, day = {09}, doi = {10.1109/BSN.2015.7299363}, eventdate = {2015-06-09/2015-06-12}, eventtitle = {2015 IEEE 12th International Conference on Wearable and Implantable Body Sensor Networks (BSN)}, faupublication = {yes}, isbn = {9781467372015}, issn = {2376-8894}, peerreviewed = {unknown}, title = {Novel Human Computer Interaction Principles for Cardiac Feedback using Google Glass and Android Wear}, type = {Konferenzschrift}, url = {https://www.mad.tf.fau.de/files/2018/04/2015-Richer-BSN-DailyHeart.pdf}, venue = {Cambridge, MA, USA}, }

COPYRIGHT NOTICE: Copyright and all rights of the material above are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by the appropriate copyright. The material may not be reposted without the explicit permission of the copyright holder.

COPYRIGHT NOTICE FOR IEEE PUBLICATIONS: © IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

COPYRIGHT NOTICE FOR EUMA PUBLICATIONS: © EUMA. Personal use of this material is permitted. Permission from European Microwave Association(EUMA) must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.