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TU Berlin

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Bachelor, Master und Diploma Theses:

A short selection of possible topics:

BSc or MSc Thesis:
An integrated sensor frontend circuit for precise characterization of resistive and capacitive contributions of sensors showing RC series circuit behaviour
(BSc or. MSc)
Supervisor:
Where: Chair of Sensor and Actuator Systems, TU Berlin
When: Immediately

MSc Thesis:
A gmC filter based sinusoidal generator with a tuning range of 50 kHz to 50 MHz in 250 nm CMOS technology
(MSc)
Supervisor: ,
Where: Chair of Sensor and Actuator Systems, TU Berlin
When: Immediately

MSc Thesis or MSc Project (applicable to 2 students):
Design and Verification of the Transport Layer for a Standardized High Speed Serial Interface (JESD204B) using SystemVerilog
(MSc)
Supervisor:
Where: Chair of Sensor and Actuator Systems, TU Berlin
When: Immediately

Development of a Chip-Based Chemical-Mechanical Polishing (CMP) Process applicable to Smart CMOS Sensor ICs
Within a joint project of various chairs within the EECS faculty of TU Berlin, CMOS-based sensor chips are developed.
In order to create transducer elements directly on the chip surface, frequently the respective CMOS wafers or chips
need to be post-processed to deposit adequate transducer materials on their surface. The respective manufacturing steps
cannot be performed within standard CMOS production lines as materials are used whose processing is not compatible
with the standard CMOS processing environment.
Aiming for increased flexibility after chip production but prior to post-processing of the transducer materials, we plan to
establish a chip-based so-called CMP process in the labs at TU Berlin. Chemical-Mechanical Polishing (CMP) is an established
process applied to CMOS wafers fabricated in advanced CMOS processes after each metallization layer to achieve
planarization (but not applied to the final wafer or chip surface).
Special equipment for this approach is available in the cleanrooms of TUB, test chips to develop such a process as well.
The students' tasks in this context are setup and operation of the respective equipment, development of a suitable CMP
process, and experimental characterization of the achieved results in terms of surface roughness and impact on the CMOS
devices.
Participants will experience the opportunity to work on an interdisciplinary, application-oriented project that offers insight
into semiconductor processing as well as into smart CMOS sensor ICs.

Contact:Dr. Jürgen Bruns, Chair of High-Frequency Technologies / Photonics
Dipl.-Phys. Anne Beyreuther, Chair of Semiconductor Devices
Prof. Dr. Roland Thewes, Chair of Sensor and Actuator Systems

"Entwurf eines Transconduktanz-Verstärkers in Hochvolt-CMOS-Technologie für die Stimulation neuronalen
Gewebes in Multielectrode Array Anwendungen
" (BSc)
oder

"Entwurf einer Verstärkereinheit in Hochvolt-CMOS-Technologie für die Stimulation neuronalen
Gewebes in Multielectrode Array Anwendungen ,it Strom- und Spannungsausgang
" (BSc)

Betreuer: Prof. Dr. Roland Thewes
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

"Entwurf einer CMOS-Sensorarray-Schaltung für das In-Vivo-Recording neuronaler Signale mit direkter
laufzeitbasierter A/D-Konvertierung
" (BSc)  

Betreuer: Prof. Dr. Roland Thewes
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

"Investigation of so-called pseudo-resistors in 180 nm CMOS technology concerning the maximum
achievable resistance under 200 mV peak-to-peak amplitude operation
"(BSc)
Betreuer: Prof. Dr. Roland Thewes
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Design und Optimierung von Schaltungskomponenten für Temperatursensoren nach dem Bandgap-Prinzip (BSc)
Betreuer:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Entwurf von Operationsverstärkern für eine Analog-Bibliothek in 180 nm CMOS-Technologie (BSc)
Betreuer:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Design of a SD modulator-based ultra-low current sensor (MSc)
Contact person:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Design of a Current-Mode Single-Slope Analog-to-Digital Converter with Built-In Error Compensation in 0.35 µm Standard CMOS Technology (BSc / MSc)
Current-Mode Single-Slope Analog-to-Digital Converters (ADCs) represent a well-known converter topology and receive very high resolution under condition that the bandwidth the current signal is low. A further advantage is their simplicity.
Operating such converters in sensor arrays, individual parameter variations translate into the requirement to calibrate every ADC. In this work, a design extension shall be implemented and tested by means of circuit simulation which helps to automatically compensate for all individual errors with little extra effort only but avoiding to apply any calibration procedure.
Contact person: Prof.  
Language of the written thesis: English or German
Place: TU Berlin, Chair of Sensor and Actuator Systems, Berlin

Echo Cancellation of Ultrasound Transducers (MSc or Diploma thesis)
Ultrasound transducers are meanwhile frequently used for distance measurements and flow metering purposes utilizing the time-of-flight principle and the known velocity of sound in gases and fluids. In low-power applications a single pulse (not an envelope of transmitted pulses) is used for the measurement. Using low-cost transducers, unfortunately afterpulsing-related signals are generated by the transmitting transducer element itself due to its mechanical properties. This leads to unacceptable measurement inaccuracies. 
In close cooperation with our industrial partner MAZ GmbH, Berlin, in this work the opportunities and limitations shall be investigated to operate a low-cost transducer with a specifically-shaped excitation signal so that single-pulse behaviour is obtained. For this purpose a measurement setup must be established consisting of a water-filled tube, a low-cost transducer as transmitter at the one end and a high-performance transducer as receiver at the other, and related equipment to operate both transducers. Measurements shall be performed and the related experimental data shall be evaluated.
Contact person:
Language of the written thesis: English or German
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Auto-Calibration of Ultrasound-Based Flow Meters
Ultrasound transducers are meanwhile frequently used for flow metering purposes utilizing the time-of-flight principle and the known velocity of sound in fluids. A typical configuration consists of a fluid-filled tube with two transducers at each end which are both operated in transmitter and receiver (duplex) mode, so that - with respect to the fluid flow - so-called upstream and downstream measurements are made. The difference of the propagation times reveals the flow velocity of the fluid. The accuracy of such flow meters is frequently limited by parameter variations of the two transducer elements. In principle, these parameter variations can be overcome by means of certain trimming methods; however, such methods are time-consuming, unpractical, and expensive. In close cooperation with our industrial partner MAZ GmbH, Berlin, in this work an auto-calibration techniques shall be investigated and practically implemented within a given measurement setup. The auto-calibration approach shall be implemented, measurements shall be made, and the performance of the auto-calibration approach shall be evaluated.
Contact person:  
Language of the written thesis: English or German
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

[New!] Setup of a Macroscopic Electromechanical Model to Demonstrate the Operation of Microscopic MEMS-Based Gyroscopes (Bsc)
Supervisor:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Design of a digital interface circuit in 180 nm CMOS technology for multi-MEA applications (BSc/MSc)
Supervisor:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

Extension of a multiplexed amplifier board for a 256 channel in-vivo neural interface by digitally programmable filter functionality (BSc)
Supervisor:
Ort: TU Berlin, FG Sensorik und Aktuatorik, Berlin

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