Physicist, Inventor and Electronics Specialist

I am a physicist with a strong specialization in electronics development. My expertise ranges from developing simple, efficient electronics to highly specialized, cutting-edge devices.
I can design the architecture of an electronic system, create schematics and layouts, and produce and test prototypes.
Leveraging my physics expertise, I can develop concepts that go beyond electronics alone—for example, optimizing sensor geometry for capacitive water level measurements.
I design measurement systems that achieve high precision when required or are tailored to meet specific accuracy needs cost-effectively.

 Technologies

• ADC, High Speed Sampling
• ADC, Precision Delta Sigma
• Analog Differential Signal Transmission
• Analog Signal Shaping / Filtering
• Analog Signal Summation
• ASICs, Integration of ASICs in PCBs
• Avalanche Photodiodes
• Charge Sensitive Preamplifier
• Detection of Analog Pulses (Pulse width: few ns to several μs)
• FPGA: High Speed Data Processing
• High Voltage Power Supply (up to 4kV)
• High Voltage Monitoring (up to 4kV)
• High Voltage Pulser (800V)
• High Speed Digital Signal Transmission
• Microcontrollers / SoCs (ESP32, PIC18F, nRF52840, nRF9152, ATSAMA5D27, AM623x, STM32F)
• Power-over-Ethernet
• Switched Power Supplies (Buck, Boost, Switched Capacitor)
• Temperature stabilization (Delta T below 0.1K)  with TEC and PID controller

Electronics Design

• Schematic + Layout
• Multilayer, defined impedance, length matching, HDI
• Rigid, Flex, Flex-Rigid
• Altium Designer, Pulsonix, KiCad

Simulation

• LTSPICE, TinaTI

Measurement Electronics Design

• System Concept + Architecture
• High Precision
• Low Noise
• High Speed
• Signal Conditioning
• Data Acquisition
• Sensors (Acceleration, 2. CO2 (NDIR, eqCO2), Humidity, Magnetic Field, Particulate Matter, Pressure (absolute, difference), Rotation, Temperature

Validation, Measurement, Debugging
I have hands-on experience with the following tools and techniques:

• ˆ Oscilloscopes: Including high-frequency measurements, inductive probes, and differential probes.
• ˆ (Arbitrary) Function Generators: Used to test analog signal processing.
• ˆ Vector Network Analyzer: Measurement of S-parameters.
• ˆ Logic Analyzers: Troubleshooting digital circuits.
• ˆ Multimeters
• ˆ Electronic Loads: Utilized for testing power supplies and simulating load conditions.
• ˆ Lab Power Supplies: For providing controlled DC power to electronic circuits.
• ˆ Spectrum Analyzers: Debugging EMV issues, identifying signal properties.
• ˆ Software Defined Radios (SDR): Receiving data sent on an ISM band.
• ˆ Reworking PCBs: Including micro-soldering for fine-pitch components and board repair.
• ˆ Rapid Prototyping: Including FDM 3D printing for creating physical prototypes quickly.

Cross-Disciplinary Skills

• Programming (Python, C, C++, Basic)
• 3D Modelling (Fusion 360, FreeCAD) and FDM 3D Printing
• Data analysis (Python, CERNRoot)
• Measurement error calculation

Project References
University of Bonn: Crystal Barrel
The Crystal Barrel is a scintillation detector that utilizes avalanche photodiodes (APDs) to capture scintillation light. I developed a large part of the electronics installed during an upgrade. Charge-sensitive preamplifiers form the first stage of the signal processing chain. Different analog filters prepare the signals for fast timing and amplitude measurement, respectively. Pulses are detected to identify hits, and the resulting hit patterns are processed using FPGAs. A custom-built HV supply for the APDs is part of the frontend and includes temperature and voltage monitoring. A light pulse generator (pulse duration: 2 μs) is used to monitor the gain of the APDs. To ensure a constant light output, the LED’s temperature is stabilized using TECs and a PID controller.
http://arxiv.org/pdf/2212.12364

University of Bonn: GEM Detectors for COMPASS
I contributed to the electronics of GEM detectors used in the COMPASS experiment at CERN. These detectors consist of several Gas Electron Multipliers (GEMs) and a segmented readout plane. Ionizing particles create free electrons, which are amplified by the GEMs to produce a signal strong enough to be processed by ASICs. Physicists provided requirements, such as measuring signals from the detector while ensuring that the electronics withstand internal discharges. I translated these into concrete technical specifications, designed the system architecture, selected components, created schematics and layouts, built the assemblies, and brought them into operation.
The highlights include:

• ˆ Modules containing the ASIC APV25 and auxiliary components (power supply, synchronous clock, and trigger distribution).
• ˆ A high-voltage supply (4 kV) with a current limitation of 200 μA.
• ˆ A high-voltage pulse generator (800 V) to simulate discharges in the detector and test the readout protection circuit.

Commercial Product Development at grandcentrix GmbH
I was employed at grandcentrix as a Embedded Hardware Developer (later promoted to team lead) and did developments in an agile environment. Technologies included:

• Battery-powered devices
• ˆDALI (Device and PSU)
• ˆDC motor drivers
• ˆLithium hybrid capacitors for energy storage
• ˆPosition measurement using magnets and Hall sensors
• ˆPosition measurement using a photointerrupter
• ˆPower over Ethernet
• ˆSound output via I2S
• ˆWireless communication: WiFi, Zigbee, Bluetooth, Thread, LTE, LTE-M, NB-IoT, NFC

The most exciting and also most challenging tasks I undertook involved debugging issues in existing products and prototypes:

• Fixing a product that failed EMC immunity testing
• ˆReducing the temperature dependence of a power supply’s current limitation
• ˆResolving an overheating issue in a step-down converter that was causing shutdowns