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Leonhard Reindl  - - - 
Top co-authors See all
Jürgen Wilde

7 shared publications

Laboratory for Assemblyand Packaging Technology,Department of Microsystems Engineering,University of Freiburg,Freiburg, Germany

Antwi Nimo

6 shared publications

Albert-Ludwigs-Univ. of Freiburg (Germany)

Elena Zukowski

6 shared publications

Laboratory for Assemblyand Packaging Technology,Department of Microsystems Engineering,University of Freiburg,Freiburg, Germany

Michael Berndt

5 shared publications

Laboratory for Assemblyand Packaging Technology,Department of Microsystems Engineering,University of Freiburg,Freiburg, Germany

Jochen Hempel

4 shared publications

Laboratory for Electrical Instrumentation,Department of Microsystems Engineering,University of Freiburg,Freiburg, Germany

242
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110
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Publication Record
Distribution of Articles published per year 
(1998 - 2018)
Total number of journals
published in
 
39
 
Publications See all
Article 0 Reads 0 Citations Inertial Sensor-Based Respiration Analysis Gurkan Karacocuk, Fabian Hoflinger, Rui Zhang, Leonhard M. R... Published: 01 January 2019
IEEE Transactions on Instrumentation and Measurement, doi: 10.1109/tim.2018.2889363
DOI See at publisher website
PROCEEDINGS-ARTICLE 0 Reads 0 Citations Using Bluetooth Low Energy to trigger an ultra-low power FSK wake-up receiver Paul Gavrikov, Pascal E. Verboket, Tolgay Ungan, Markus Mull... Published: 01 December 2018
2018 25th IEEE International Conference on Electronics, Circuits and Systems (ICECS), doi: 10.1109/icecs.2018.8618031
DOI See at publisher website
Article 1 Read 0 Citations Electromagnetic Analysis, Characterization and Discussion of Inductive Transmission Parameters for Titanium Based Housin... Waldemar Gruenwald, Mayukh Bhattacharrya, Dirk Jansen, Leonh... Published: 25 October 2018
Materials, doi: 10.3390/ma11112089
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
The growing demand for active medical implantable devices requires data and or power links between the implant and the outside world. Every implant has to be encapsulated from the body by a specific housing and one of the most common materials used is titanium or titanium alloy. Titanium thas the necessary properties in terms of mechanical and chemical stability and biocompatibility. However, its electrical conductivity presents a challenge for the electromagnetic transmission of data and power. The proposed paper presents a fast and practical method to determine the necessary transmission parameters for titanium encapsulated implants. Therefore, the basic transformer-transmission-model is used with measured or calculated key values for the inductances. Those are then expanded with correction factors to determine the behavior with the encapsulation. The correction factors are extracted from finite element method simulations. These also enable the analysis of the magnetic field distribution inside of the housing. The simulated transmission properties are very close to the measured values. Additionally, based on lumped elements and magnetic field distribution, the influential parameters are discussed in the paper. The parameter discussion describes how to enhance the transmitted power, data-rate or distance, or to reduce the size of the necessary coils. Finally, an example application demonstrates the usage of the methods.
Article 1 Read 1 Citation An Ultra-Low-Power RFID/NFC Frontend IC Using 0.18 μm CMOS Technology for Passive Tag Applications Mayukh Bhattacharyya, Waldemar Gruenwald, Dirk Jansen, Leonh... Published: 07 May 2018
Sensors, doi: 10.3390/s18051452
DOI See at publisher website ABS Show/hide abstract
Battery-less passive sensor tags based on RFID or NFC technology have achieved much popularity in recent times. Passive tags are widely used for various applications like inventory control or in biotelemetry. In this paper, we present a new RFID/NFC frontend IC (integrated circuit) for 13.56 MHz passive tag applications. The design of the frontend IC is compatible with the standard ISO 15693/NFC 5. The paper discusses the analog design part in details with a brief overview of the digital interface and some of the critical measured parameters. A novel approach is adopted for the demodulator design, to demodulate the 10% ASK (amplitude shift keying) signal. The demodulator circuit consists of a comparator designed with a preset offset voltage. The comparator circuit design is discussed in detail. The power consumption of the bandgap reference circuit is used as the load for the envelope detection of the ASK modulated signal. The sub-threshold operation and low-supply-voltage are used extensively in the analog design—to keep the power consumption low. The IC was fabricated using 0.18 μm CMOS technology in a die area of 1.5 mm × 1.5 mm and an effective area of 0.7 mm2. The minimum supply voltage desired is 1.2 V, for which the total power consumption is 107 μW. The analog part of the design consumes only 36 μW, which is low in comparison to other contemporary passive tags ICs. Eventually, a passive tag is developed using the frontend IC, a microcontroller, a temperature and a pressure sensor. A smart NFC device is used to readout the sensor data from the tag employing an Android-based application software. The measurement results demonstrate the full passive operational capability. The IC is suitable for low-power and low-cost industrial or biomedical battery-less sensor applications. A figure-of-merit (FOM) is proposed in this paper which is taken as a reference for comparison with other related state-of-the-art researches.
Article 1 Read 1 Citation An Ultra-Low-Power RFID/NFC Frontend IC Using 0.18 μm CMOS Technology for Passive Tag Applications. Mayukh Bhattacharyya, Waldemar Gruenwald, Dirk Jansen, Leonh... Published: 07 May 2018
Sensors,
PubMed View at PubMed ABS Show/hide abstract
Battery-less passive sensor tags based on RFID or NFC technology have achieved much popularity in recent times. Passive tags are widely used for various applications like inventory control or in biotelemetry. In this paper, we present a new RFID/NFC frontend IC (integrated circuit) for 13.56 MHz passive tag applications. The design of the frontend IC is compatible with the standard ISO 15693/NFC 5. The paper discusses the analog design part in details with a brief overview of the digital interface and some of the critical measured parameters. A novel approach is adopted for the demodulator design, to demodulate the 10% ASK (amplitude shift keying) signal. The demodulator circuit consists of a comparator designed with a preset offset voltage. The comparator circuit design is discussed in detail. The power consumption of the bandgap reference circuit is used as the load for the envelope detection of the ASK modulated signal. The sub-threshold operation and low-supply-voltage are used extensively in the analog design—to keep the power consumption low. The IC was fabricated using 0.18 μ m CMOS technology in a die area of 1.5 mm × 1.5 mm and an effective area of 0.7 m m 2 . The minimum supply voltage desired is 1.2 V, for which the total power consumption is 107 μ W. The analog part of the design consumes only 36 μ W, which is low in comparison to other contemporary passive tags ICs. Eventually, a passive tag is developed using the frontend IC, a microcontroller, a temperature and a pressure sensor. A smart NFC device is used to readout the sensor data from the tag employing an Android-based application software. The measurement results demonstrate the full passive operational capability. The IC is suitable for low-power and low-cost industrial or biomedical battery-less sensor applications. A figure-of-merit (FOM) is proposed in this paper which is taken as a reference for comparison with other related state-of-the-art researches.
Article 1 Read 1 Citation Design of a Programmable Passive SoC for Biomedical Applications Using RFID ISO 15693/NFC5 Interface Mayukh Bhattacharyya, Waldemar Gruenwald, Dirk Jansen, Leonh... Published: 31 January 2018
Journal of Low Power Electronics and Applications, doi: 10.3390/jlpea8010003
DOI See at publisher website ABS Show/hide abstract
Low power, low cost inductively powered passive biotelemetry system involving fully customized RFID/NFC interface base SoC has gained popularity in the last decades. However, most of the SoCs developed are application specific and lacks either on-chip computational or sensor readout capability. In this paper, we present design details of a programmable passive SoC in compliance with ISO 15693/NFC5 standard for biomedical applications. The integrated system consists of a 32-bit microcontroller, a sensor readout circuit, a 12-bit SAR type ADC, 16 kB RAM, 16 kB ROM and other digital peripherals. The design is implemented in a 0.18 μm CMOS technology and used a die area of 1.52 mm × 3.24 mm. The simulated maximum power consumption of the analog block is 592 μW. The number of external components required by the SoC is limited to an external memory device, sensors, antenna and some passive components. The external memory device contains the application specific firmware. Based on the application, the firmware can be modified accordingly. The SoC design is suitable for medical implants to measure physiological parameters like temperature, pressure or ECG. As an application example, the authors have proposed a bioimplant to measure arterial blood pressure for patients suffering from Peripheral Artery Disease (PAD).
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