ESR 08: Ivan Berdalovic

Host Institution: 
Device and circuit design for radiation hard CMOS sensors and their optimization through simulation and measurements
BSc, MSc in Electrical Engineering and Information Technology (Electronics profile), Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia
Research Interests: 

- Particle physics

- Semiconductor detectors

- Design of analogue and mixed-signal integrated circuits

- Device physics, physics in general, math

- Measurements on electrical equipment


When my father introduced me to Archimedes' law at the age of 5, it instantly sparked an interest in physics and science which has remained ever since. For that reason, when I finished high school in my small Croatian home town, I embarked on a journey to the capital to study electrical engineering.

 During the five years spent there, my main focus was on microelectronics and electronic devices as well as the design of analogue and digital integrated circuits. While I was writing my thesis on avalanche photodiodes, I came across a job opening for an EU project called STREAM. I found the topic of the project very interesting and I immediately decided to apply. Having finished the thesis, after few interviews I found myself working at CERN as an electronics designer for the ATLAS experiment.

 When I'm not designing circuits, you will probably find me playing table tennis near the CERN Restaurant 1 or at home watching one of the latest film releases on my TV.

Research at STREAM: 

The particle physics experiments at CERN use silicon pixel detectors for the detection of subatomic particles. As a member of the ATLAS design group, my role is to participate in the design and characterisation of a novel pixel detector for the upgrade of the ATLAS experiment.

The first part of the research project focuses on the design and device simulations of CMOS sensors with an emphasis on radiation hard, low power integrated circuit design in the selected image sensor processes. This consists of various designs included in a full-scale monolithic pixel detector prototype for ATLAS, such as the sensor cell, the analogue amplification stage and the digital readout architecture.

The second part of the research focuses on the testing of the designed prototype structures. Radiation tests and qualification of the circuits in irradiation campaigns, lab measurements and testbeams will give feedback to the design efforts. Following this, the existing designs will be further improved and included in a full ATLAS-ready pixel detector chip.



Host Institution and Secondment Topic 

Expected secondment period

UBonn (DE), Detector design and testing activities

3 weeks in September 2018

University of Zagreb (Croatia), PhD courses

 4  weeks in February 2019


<p><span lang="EN-US"><font size="3">My research aims to prove that monolithic pixel detectors can be used even in the most demanding environments, such as the ATLAS experiment, potentially giving rise to other new applications for these devices used in similar environments.</font></span></p>

<p><span lang="EN-US"><font size="3">I find this topic truly fascinating and it corresponds perfectly with my desire to continue my studies with a PhD on an interesting and challenging topic. Working as an Early Stage Researcher in STREAM ITN has given me the unique opportunity to expand my knowledge of electronics and electrical circuits as well as acquire knowledge in some completely new areas, such as particle physics and accelerators.</font></span></p>

<p><span lang="EN-US"><font size="3">I very much enjoy working in an international research group with people from all around the world and I think this is a great environment to become an expert in my chosen field.</font></span></p>

Beam telescopes and test beam workshop, Barcelona (ES)
11th International Conference on Position Sensitive Detectors (PSD11),  The Open University, Milton Keynes (UK)
2018 IEEE Nuclear Science Symposium and Medical Imaging Conference
Development of depleted monolithic CMOS pixels with fast readout architecture for the ATLAS Inner Tracker upgrade
Monolithic Pixel Development in TowerJazz 180nm CMOS for the outer pixel layers in the ATLAS experiment
CMOS monolithic pixel sensors based on the column-drain architecture for the HL-LHC upgrade
Depleted fully monolithic CMOS pixel detectors using a column based readout architecture for the ATLAS Inner Tracker upgrade
LAPA, a 5 Gb/s modular pseudo-LVDS driver in 180 nm CMOS with capacitively coupled pre-emphasis
MALTA: an asynchronous readout CMOS monolithic pixel detector for the ATLAS High-Luminosity upgrade
The Monopix chips: depleted monolithic active pixel sensors with a column-drain read-out architecture for the ATLAS Inner Tracker upgrade
Development of the monolithic "MALTA" CMOS sensor for the ATLAS ITK outer pixel layer
Measurement results of the MALTA monolithic pixel detector
Update on the TowerJazz CMOS DMAPS development for the ATLAS ITk
The Malta CMOS pixel detector prototype for the ATLAS Pixel ITK
MALTA: a CMOS pixel sensor with asynchronous readout for the ATLAS High-Luminosity upgrade
Mini-MALTA: Radiation hard pixel designs for small-electrode monolithic CMOS sensors for the High Luminosity LHC

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