Veröffentlichungen

2012

M. Ziegler, M. Oberländer, D. Schroeder, W.H. Krautschneider, H. Kohlstedt

Memristive operation mode of floating gate transistors: A two-terminal MemFlash-cell

Artikel in "Applied Physics Letters", vol. 101, p. 263504, 2012

Abstract:
A memristive operation mode of a single floating gate transistor is presented. The device resistance varied accordingly to the charge flow through the device. Hysteretic current-voltages including a resistance storage capability were observed. These experimental findings are theoretically supported by a capacitive based model. The presented two-terminal MemFlash-cell can be considered as a potential substitute for any memristive device (especially for reconfigurable logic, cross-bar arrays, and neuromorphic circuits) and is basically compatible with current Si-fabrication technology. The obvious trade-off between a memristive device based on a state-of-the-art silicon process technology and power consumption concerns will be discussed.

BibTeX:
@article{Ziegler:APL:2012,
author = {M. Ziegler and M. Oberl{\"a}nder and D. Schroeder and W.H. Krautschneider and H. Kohlstedt},
title = {{M}emristive operation mode of floating gate transistors: {A} two-terminal {M}em{F}lash-cell},
year = {2012},
month = {12},
journal = {Applied Physics Letters},
pages = {263504},
volume = {101} }

[Abstract] [BibTeX] [DOI]
Farzad Hosseini, Dietmar Schroeder, Wolfgang H. Krautschneider

Capacitive sensors for detection of the movement artifacts in active capacitive electrocardiography electrodes

In Tagungsband "BMEiCON 2012", 2012
BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012

Abstract:
A capacitive sensor system is integrated into an active capacitive ECG electrode. This system provides a signal, which is correlated with movement artifacts during ECG signal acquisition, and can be used as reference signal in an adaptive filter.

BibTeX:
@inproceedings{Hosseini:BMEiCON:2012,
author = {Farzad Hosseini and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{C}apacitive sensors for detection of the movement artifacts in active capacitive electrocardiography electrodes},
year = {2012},
month = {12},
booktitle = {BMEiCON 2012},
note = {BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012} }

[Abstract] [BibTeX]
Ricardo Starbird, Wolfgang Bauhofer, Mario A. Meza-Cuevas and Wolfgang H. Krautschneider

Effect of experimental factors on the properties of PEDOT-NaPSS galvanostatically deposited from an aqueous micellar media for invasive electrodes

In Tagungsband "BMEiCON 2012", 2012
BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012

Abstract:

BibTeX:
@inproceedings{Starbird:BMEiCON:2012,
author = {Ricardo Starbird and Wolfgang Bauhofer and Mario A. Meza-Cuevas and Wolfgang H. Krautschneider},
title = {{E}ffect of experimental factors on the properties of {P}{E}{D}{O}{T}-{N}a{P}{S}{S} galvanostatically deposited from an aqueous micellar media for invasive electrodes},
year = {2012},
month = {12},
booktitle = {BMEiCON 2012},
note = {BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012} }

[BibTeX] [DOI]
Mario A. Meza-Cuevas, Karthik Ramesh, Dietmar Schroeder and Wolfgang H. Krautschneider

Hybrid architecture of a DAC for neurostimulation

In Tagungsband "BMEiCON 2012", 2012
BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012

Abstract:
Electrical Neurostimulation has been effective for treating and reducing symptoms of neurological diseases, for alleviating some types of chronic pain and for restoring sensory or neuromuscular deficits. Because of the energy and size limitation on fully implantable devices, it is important to keep devices small and at low power. It was already demonstrated that non-rectangular waveforms provide a more energy-efficient neural stimulation. In this article is shown how a hybrid architecture of current steering DAC is suitable to this application, because of its specifications: the ability to convert several waveforms directly from digital to analog current signals, low power consumption, small chip area requirement, the capability of sharing common stages and also for its simplicity. An ASIC has been developed composed of four stimulator channels, capable of driving several current waveforms. The design is implemented in 130 nm CMOS technology.

BibTeX:
@inproceedings{Meza:BMEiCON:2012,
author = {Mario A. Meza-Cuevas and Karthik Ramesh and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{H}ybrid architecture of a {D}{A}{C} for neurostimulation},
year = {2012},
month = {12},
booktitle = {BMEiCON 2012},
note = {BMEiCON 2012, Ubon Ratchathani, Thailand, 5-7 Dec 2012} }

[Abstract] [BibTeX]
B.T. Bradford, W. Krautschneider, D. Schroeder

A 10 bit Fully Differential SAR ADC in 130nm CMOS Technology with Variable Offset Comparator Trimming

In Tagungsband "ICT.Open 2012", 2012
Rotterdam, 22-23 October 2012

Abstract:
A 10 bit fully differential input SAR ADC has been developed as part of a micro-machined capacitive pressure sensor measurement system for a wireless medical implant.

BibTeX:
@inproceedings{Bradford_ICTOpen:2012,
author = {B.T. Bradford and W. Krautschneider and D. Schroeder},
title = {{A} 10 bit {F}ully {D}ifferential {S}{A}{R} {A}{D}{C} in 130nm {C}{M}{O}{S} {T}echnology
with {V}ariable {O}ffset {C}omparator {T}rimming},
year = {2012},
month = {10},
booktitle = {ICT.Open 2012},
note = {Rotterdam, 22-23 October 2012} }

[Abstract] [BibTeX]
Farzad Hosseini, Dietmar Schroeder, Wolfgang H. Krautschneider

Digitally controlled analog frontend for capacitive ECG measurements

In Tagungsband "ICT.Open 2012", 2012
Rotterdam, 22-23 October 2012

Abstract:
In this work we describe a capacitive ECG system, which is based on an ASIC designed in our institute. Here we will focus on the analog frontend of the system and specify and verify the optimal design performance to fulfil the required task.

BibTeX:
@inproceedings{Hosseini:ICTOpen:2012,
author = {Farzad Hosseini and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{D}igitally controlled analog frontend for capacitive {E}{C}{G} measurements},
year = {2012},
month = {10},
booktitle = {ICT.Open 2012},
note = {Rotterdam, 22-23 October 2012} }

[Abstract] [BibTeX]
Diego Lujan Villarreal, Dietmar Schroeder and Wolfgang H. Krautschneider

Equivalent circuit model to simulate the neuromuscular electrical stimulation

In Tagungsband "ICT.Open 2012", 2012
Rotterdam, 22-23 October 2012

Abstract:
In this study, an equivalent circuit model (ECM) to simulate the Neuromuscular Electrical Stimulation (NMES) has been developed. The ECM was built from the transcutaneous electrodes to the cell membrane to simulate the nerve stimulation with biphasic rectangular waveform. The model was developed in a series of ‘tissue subsystems’, hence these can be treated independently. The frequency and current density dependency of the electrode-electrolyte gel-skin interfaces and of the tissues were considered. The ECM was used to simulate in PSpice 6 strength–duration curves obtained by experimental transcutaneous stimulation of the extensor muscles in the forearm of one subject using two fully gelled electrodes of size 45x80 mm². To ensure the muscle contraction, a three axial accelerometer was placed on the proximal phalange of the middle finger. The mean voltage response in the stimulation experiments was compared with ECM simulations with the waveform mentioned. The energy dissipation in the human tissue layers was investigated using the ECM. The correlation coefficient was used to evaluate quantitatively the agreement between simulations and experiments.

BibTeX:
@inproceedings{Lujan:ICTOpen:2012,
author = {Diego Lujan Villarreal and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{E}quivalent circuit model to simulate the neuromuscular electrical stimulation},
year = {2012},
month = {10},
booktitle = {ICT.Open 2012},
note = {Rotterdam, 22-23 October 2012} }

[Abstract] [BibTeX]
Mario A. Meza-Cuevas, Alexander Gummenscheimer, Dietmar Schroeder and Wolfgang H. Krautschneider

Portable Neuromuscular Electrical Stimulator

In Tagungsband "ICT.Open 2012", 2012
Rotterdam, Netherlands, 22-23 October 2012

Abstract:
Neuromuscular electrical stimulation is useful for restoring the movement of extremities in the treatment of some neurological disorders. A portable neuromuscular stimulator was developed for rehabilitation, Functional Electrical Stimulation (FNS) and for experimentation. The device is battery powered and can be controlled wirelessly. The adjustable current output is one of the advantages of this stimulator, because it can deliver several waveforms and it is possible to change every parameter on the stimulation signal. Power consumption, high selectivity, patient comfort and portability are important terms for medical electronic devices. Several setups were developed for the neuromuscular stimulator in order to perform different experiments.

BibTeX:
@inproceedings{Meza:ICTOpen:2012,
author = {Mario A. Meza-Cuevas and Alexander Gummenscheimer and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{P}ortable {N}euromuscular {E}lectrical {S}timulator},
year = {2012},
month = {10},
booktitle = {ICT.Open 2012},
note = {Rotterdam, Netherlands, 22-23 October 2012} }

[Abstract] [BibTeX]
Mario A. Meza-Cuevas, Dietmar Schroeder and Wolfgang H. Krautschneider

Neuromuscular Electrical Stimulation Using Different Waveforms: Properties comparison by applying single pulses

In Tagungsband "International Conference on BioMedical Enginering and Informatics 2012", 2012, p. 840-845
BMEI 2012, Chongqing, China, 16-18 Oct 2012

Abstract:
Electrical Neurostimulation is useful in several medical therapies, for the treatment of neuromuscular deficits and for restoring physiological and sensory functions. Fully implantable devices are preferable in order to reach high selectivity and to give comfort to the patient. However, smaller devices bring more challenges regarding fabrication techniques and technology compliances, and power consumption is an important issue. In this study we analyze the use of different waveforms for performing neuromuscular stimulation, and we show how different waveforms require less energy to produce the same muscle reaction.

BibTeX:
@inproceedings{Meza:BMEI:2012,
author = {Mario A. Meza-Cuevas and Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{N}euromuscular {E}lectrical {S}timulation {U}sing {D}ifferent {W}aveforms: {P}roperties comparison by applying single pulses},
year = {2012},
month = {10},
booktitle = {International Conference on BioMedical Enginering and Informatics 2012},
note = {BMEI 2012, Chongqing, China, 16-18 Oct 2012},
pages = {840-845} }

[Abstract] [BibTeX] [DOI]
B.T. Bradford, W. Krautschneider, D. Schroeder

Wireless power transmission for powering medical implants situated in an abdominal aortic aneurysm

In Tagungsband "46th DGBMT Annual Conference (BMT 2012)", 2012, p. 887-890
BMT 2012, Jena, 16.-19. Sept. 2012

Abstract:
This paper will describe a wireless power transmission system which has been used during in vivo testing to power a blood pressure sensing implant located inside the abdominal aorta of a 100 kg swine. Wireless power transmission is accomplished using an external power sender which is magnetically coupled to an RF energy harvester block which has been integrated into the medical implant’s system package. The power sender is a class E amplifier which drives a wire loop antenna at 4 MHz, and the power receiver uses a ferro-magnetic core in an LC resonant circuit coupled to a Schottky diode charge pump rectifier followed by a DC voltage regulator.

BibTeX:
@inproceedings{Bradford:BMT:2012,
author = {B.T. Bradford and W. Krautschneider and D. Schroeder},
title = {{W}ireless power transmission for powering medical implants situated in an abdominal aortic aneurysm},
year = {2012},
month = {09},
booktitle = {46th DGBMT Annual Conference (BMT 2012)},
note = {BMT 2012, Jena, 16.-19. Sept. 2012},
pages = {887-890} }

[Abstract] [BibTeX] [DOI]
K.M. Hafkemeyer, A. Domdey, D. Schroeder, W.H. Krautschneider

Array Test Structures for Gate Dielectric Integrity Measurements and Statistics

Artikel in "IEEE Transactions on Semiconductor Manufacturing", vol. 25, Nr. 2, p. 130 -135, 2012

Abstract:
An array test structure for highly parallelized stressing and measurements of ultrathin MOS gate dielectrics is presented. The array test structure consisting of thousands of NMOS devices under test (DUTs) provides a large and significant statistical base for analysis of dielectric breakdown and the stress induced degradation of transistor parameters. The test array has been fabricated in a standard mixed-mode 130 nm CMOS technology. As such technologies offer both thin and thick gate dielectrics for MOS transistors, different gate dielectric thicknesses have been chosen for DUTs and digital control logic which gives the possibility to stress the DUTs with high gate voltages and prevent the control logic from degradation.

BibTeX:
@article{Hafkemeyer:TransSM:2012,
author = {K.M. Hafkemeyer and A. Domdey and D. Schroeder and W.H. Krautschneider},
title = {{A}rray {T}est {S}tructures for {G}ate {D}ielectric {I}ntegrity {M}easurements and {S}tatistics},
year = {2012},
month = {05},
journal = {IEEE Transactions on Semiconductor Manufacturing},
number = {2},
pages = {130 -135},
volume = {25} }

[Abstract] [BibTeX] [DOI]
S. Lewis, M.F. Russold, H. Dietl, R. Ruff, T. Doerge, K.-P. Hoffmann, L. Abu-Saleh, D. Schroeder, W. Krautschneider, S. Westendorff, A. Gail, T. Meiners, and E. Kaniusas

Acquisition of muscle activity with a fully implantable multi-channel measurement system

In Tagungsband "IEEE International Instrumentation and Measurement Technology Conference (I2MTC)", 2012, p. 996 -999
Graz, 13.-16. May, 2012

Abstract:
This work presents intramuscular measurements of the electromyogram (EMG) during goal directed arm movements. Thin film electrode arrays were epimysially implanted on the deltoideus of a rhesus macaque and the encapsulation process was monitored by impedance measurements. Increase of impedance plateaued after four weeks indicating a complete incorporation of electrodes. EMG recorded with these electrodes yielded a signal to noise ratio of about 80 dB at 200 Hz. The EMG recorded during goal directed arm movements showed high similarity amongst movements in the same direction while presenting clear differences between different movement directions. A second implantation of the whole measurement system for nine weeks proved good handling and biotolerance.

BibTeX:
@inproceedings{Lewis:I2MTC:2012,
author = {S. Lewis and M.F. Russold and H. Dietl and R. Ruff and T. Doerge and K.-P. Hoffmann and L. Abu-Saleh and D. Schroeder and W. Krautschneider and S. Westendorff and A. Gail and T. Meiners and and E. Kaniusas},
title = {{A}cquisition of muscle activity with a fully implantable multi-channel measurement system},
year = {2012},
month = {05},
booktitle = {IEEE International Instrumentation and Measurement Technology Conference (I2MTC)},
note = {Graz, 13.-16. May, 2012},
pages = {996 -999} }

[Abstract] [BibTeX] [DOI]
Kuhl, Matthias and Müller, Claas and Manoli, Yiannos and Erdler, Gilbert

Electrical voltage supply

Verlag Google Patents, mar 2012
US Patent 8,129,861

Abstract:

BibTeX:
@misc{kuhl2012electrical,
author = {Kuhl and Matthias and M{\"u}ller and Claas and Manoli and Yiannos and Erdler and Gilbert},
title = {{E}lectrical voltage supply},
year = {2012},
month = {03},
note = {US Patent 8,129,861},
publisher = {Google Patents} }

[BibTeX]
Kuhl, Matthias and Müller, Claas and Manoli, Yiannos and Erdler, Gilbert

Electrical voltage supply

mar 2012
US Patent 8,129,861

Abstract:

BibTeX:
@misc{kuhl2012electrical2,
author = {Kuhl and Matthias and M{\"u}ller and Claas and Manoli and Yiannos and Erdler and Gilbert},
title = {{E}lectrical voltage supply},
year = {2012},
month = {03},
note = {US Patent 8,129,861} }

[BibTeX]
Lait Abu-Saleh, Wjatscheslaw Galjan, Jakob Tomasik,Dietmar Schroeder, Wolfgang H. Krautschneider

A 130nm ASIC for EMG Signal Acquisition to Control a Hand Prosthetic

In Tagungsband "BIODEVICES 2012", 2012, p. 149-153
BIODEVICES 2012, Vilamoura, Portugal, 1.-4. February 2012

Abstract:
A mixed-signal chip in 130nm Technology is described. The chip acquires EMG signals from five differential inputs. The signals are amplified, multiplexed and digitized inside the developed chip. The ASIC is optimised for low power and low noise and is intended for application in medical implants. Furthermore, the chip provides a configuration option for several parameters for the analogue part of the chip. The chip has been tested by recording EMG signals from implanted myo-electrodes.

BibTeX:
@inproceedings{AbuSaleh:MyoC1Biodevices:2012,
author = {Lait Abu-Saleh and Wjatscheslaw Galjan and Jakob Tomasik,Dietmar Schroeder and Wolfgang H. Krautschneider},
title = {{A} 130nm {A}{S}{I}{C} for {E}{M}{G} {S}ignal {A}cquisition to {C}ontrol a {H}and {P}rosthetic},
year = {2012},
month = {02},
booktitle = {BIODEVICES 2012},
note = {BIODEVICES 2012, Vilamoura, Portugal, 1.-4. February 2012},
pages = {149-153} }

[Abstract] [BibTeX] [DOI]
Mario A. Meza Cuevas, Lait Abu-Saleh, Dietmar Schroeder, Wolfgang Krautschneider

Toward the optimal architecture of an ASIC for neurostimulation

In Tagungsband "BIODEVICES 2012", 2012, p. 179-184
BIODEVICES 2012, Vilamoura, Portugal, 1-4. February 2012

Abstract:
Electrical Neurostimulation has been effective in several medical therapies and also for restoring physiological, sensory and neuromuscular deficits. The rectangular pulse waveform has been used as a standard shape for neural stimulation. However, it has been shown that non-rectangular waveforms provide a more energy-efficient neural stimulation. An ASIC has been developed composed of a stimulator, capable of driving several current waveforms, and an analog channel for biosignal acquisition. The design is implemented in 130 nm / 1.2 V CMOS technology, requiring a silicon area of 0.696 mm2. Experimental results show that the stimulator can generate analog signals from a digital input of 8 bits. The output stage can drive up to ±9.8 μA, with a DNL and INL of 0.47 and 1.05 LSB, respectively. Its SFDR is 50.2 dB. And it consumes a maximum of 128.12 μW. The analog input channel presents a power consumption of 140 μW, a gain of 52.2 dB, a bandwidth of 0.5 – 1130 Hz and 10 μVrms of noise.

BibTeX:
@inproceedings{Meza:BIOSTEC:2012,
author = {Mario A. Meza Cuevas and Lait Abu-Saleh and Dietmar Schroeder and Wolfgang Krautschneider},
title = {{T}oward the optimal architecture of an {A}{S}{I}{C} for neurostimulation},
year = {2012},
month = {02},
booktitle = {BIODEVICES 2012},
note = {BIODEVICES 2012, Vilamoura, Portugal, 1-4. February 2012},
pages = {179-184} }

[Abstract] [BibTeX] [DOI]
Arthur Schott, Wjatscheslaw Galjan and Wolfgang Krautschneider

16-Kanal ASIC mit ECoG Signalaufnahmesystemen für neurologische Experimente

Artikel in "PTB, BBS 2012", 2012

Abstract:

BibTeX:
@article{Schott_BBS2012,
author = {Arthur Schott and Wjatscheslaw Galjan and Wolfgang Krautschneider},
title = {16-{K}anal {A}{S}{I}{C} mit {E}{C}o{G} {S}ignalaufnahmesystemen f{\"u}r neurologische {E}xperimente},
year = {2012},
journal = {PTB, BBS 2012} }

[BibTeX]
Fabian Wagner

Automatisierte Partitionierung von Mixed-Signal Schaltungen für die Realisierung von Systems-in-Package

Dissertation an der Technische Universität Hamburg-Harburg (Logos Verlag Berlin, Comeniushof, Gubener Str. 47,10243 Berlin), 2012

Abstract:

BibTeX:
@phdthesis{Wagner:SiP:2012,
author = {Fabian Wagner},
title = {{A}utomatisierte {P}artitionierung von {M}ixed-{S}ignal {S}chaltungen f{\"u}r die {R}ealisierung von {S}ystems-in-{P}ackage},
year = {2012},
address = {Logos Verlag Berlin, Comeniushof, Gubener Str. 47,10243 Berlin},
school = {Technische Universit{\"a}t Hamburg-Harburg} }

[BibTeX]
Farzad Hosseini and Wolfgang Krautschneider

Kapazitives Sensorsystem zur Ableitung und Unterdrückung der Bewegungsartefakte in kapazitiven EKG Elektroden

Artikel in "PTB, BBS 2012", 2012

Abstract:

BibTeX:
@article{Hosseini_BBS2012,
author = {Farzad Hosseini and Wolfgang Krautschneider},
title = {{K}apazitives {S}ensorsystem zur {A}bleitung und {U}nterdr{\"u}ckung der {B}ewegungsartefakte in kapazitiven {E}{K}{G} {E}lektroden},
year = {2012},
journal = {PTB, BBS 2012} }

[BibTeX]

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