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Offers : 83

Pixel wise coded aperture for new acquisition paradigms in CMOS Image Sensors based on active illumination

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Start date : 1 October 2020

offer n° SL-DRT-20-0917

Active illumination combined with image sensors bring the opportunity to extract a large amount of features about the observed scene that are generally not reachable to standard image acquisition approaches. This modality is now largely spread in industrial computer vision, consumer electronics and medical imaging applications. However, major challenges still need to be solved to increase the performances of such devices, and many associated research questions need to be addressed, with respect to the choices of the modulation and measurement strategy, the sensor architecture, or the signal processing techniques to employ for data analysis.

The goal of this thesis is to jointly address those issues by first proposing a simulation framework aiming at finding the best trade-offs between light modulation and signal reconstruction approaches. Then, developing the system that will best fit to the derived specifications according to typical scene characteristics (ballistic or diffuse light behavior, depth range and resolution, ambient light levels, light source interferences…) will be addressed. This thesis will be structured in two main parts. The first part will tend to define an exploration framework based on a combination of physical modeling, physical measurements and deep learning approaches. Based on this tool, the second part will be dedicated to the development of an image sensor architecture using the issued specifications.

The PhD student will benefit during his 3-years thesis of the expertise and the scientific excellence of the CEA Leti to attend objectives with a high level of innovation through international patents and publications. The dynamic and autonomous candidate will have a master or Engineer degree, specialized in electrical engineering and signal processing. A good knowledge of circuit design CAD and programming tools will be important (Cadence, Matlab, Python) and some basics in optics will be appreciated.

  • Keywords : Electronics and microelectronics - Optoelectronics, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : SL-DRT-20-0917
  • Contact : arnaud.verdant@cea.fr

Innovative haptic interface

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Start date : 1 September 2020

offer n° SL-DRT-20-0724

A haptic interface allows to the user to interact with its environment by the sense of touch. It can be used for example to give complex information in harsh, noisy or low visibility environment. Today, demonstrators provide haptic effects essentially on glass screen. We propose to develop innovative haptic solutions to generate complex effects on curved surfaces, conformable, and potentially in various materials such as metal, plastic…

The objective of the candidate will be to design, build and characterize haptic interfaces. A reflection will be conducted on the different possibilities to integrate this haptic function on various substrates. To do this, he will develop analytical models and use finite element method (COMSOL). Supervised by CEA experts on the subject, he will propose the most adapted technology (thin-film actuators or bulk piezoceramics) to integrate piezoelectric actuators able to generate the haptic effect on curved surfaces, conformable, ideally flexible. Finally, a reflection on the global system will be necessary in order to propose an innovative and complex haptic demonstrator integrating different functions such as finger position detection, actuation and driving mechanisms.

  • Keywords : Mechanics, energetics, process engineering, DCOS, Leti
  • Laboratory : DCOS / Leti
  • CEA code : SL-DRT-20-0724
  • Contact : fabrice.casset@cea.fr

Bio sensir using near field propagation of millimeter waves

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Start date : 1 October 2020

offer n° SL-DRT-20-0933

In the context of new bio-medical applications, we propose to use solutions from the radio-frequency domain, namely using millimeter wave systems, which had to radiate with nearfield antenna. Depending on the antenna neighborhood, the behavior of the radiated wave changes with its frequency and amplitude. This PhD aims to detecte physiological parameters using this signature of the environnement at different wavelength, signal amplitude and even signal shape (chirp). This physiological parameter could be the sweat, the hartbeat, melanoma, but not only. Target frequency could be from 20GHz to 120GHz which are easy for CMOS integration. From an existing study, the PhD student will have to developpe an accurate solution, which could be based on the antenna impedance variation due to the environement (Power Amplifier output impedance modification tracking) or the analysis of the reflected signal thought a polar receiver (radar mode).

  • Keywords : Electronics and microelectronics - Optoelectronics, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : SL-DRT-20-0933
  • Contact : frederic.hameau@cea.fr

Tunable SOI-CMOS/GaN HPA for 5G infrastructure

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Start date : 1 October 2020

offer n° SL-DRT-20-0839

RF GaN technology has emerged as a strong candidate for high power 5G PA (HPA). The high power density, low output capacitance, and high breakdown voltage of GaN transistors make them attractive for the 5G small-cell market that requires several watts of output power at high frequencies (up to 40GHz). In this Ph.D. work, the student will investigate the heterogeneous SOI-CMOS/GaN Integration of a mmWave high-efficiency HPA. The output stage of the HPA will use Doherty architecture in order to achieve high-efficiency in the back-off region. It will be implemented on GaN to achieve the required power levels. To avoid the performances degradation of the Doherty stage over frequency, the input phase and driver level of the main and auxiliary transistors of the Doherty PA need to be carefully controlled. The driver stage of the Doherty stage will be implemented on SOI technology in order to enable tunability of the drive signals (phase and amplitude) using reconfigurable passives on SOI. This digitally assisted HPA will allow the optimization of both linearity and efficiency over wide frequency range of operation in a compact solution.

This PhD thésis is proposed as an international PhD, diploma from University of Grneoble Alps, in collaboration with a European Partner. This PhD maybe a strong opportunity for the student for mutual collaboration, and a stay abroad.

  • Keywords : Electronics and microelectronics - Optoelectronics, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : SL-DRT-20-0839
  • Contact : ayssar.serhan@cea.fr

Impact of micro-architecture on side-channel attack countermeasures

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Start date : 1 September 2020

offer n° SL-DRT-20-0921

The context of this thesis is the context of cyber-security for embedded systems and IoT. The thesis addresses the application of countermeasures by compilation against side-channel attacks exploiting power consumption or electromagnetic emissions, which represent a major threat against these systems.

A leakage model can be used when applying countermeasures: it models how side-channel leakages are related to the program and the data being manipulated by the processor. An unfaithful model does not allow the countermeasure to be applied effectively. The models currently employed are insufficient since they do not take into account the micro-architecture of the components. Indeed, micro-architecture and in particular elements that are invisible at the assembly level (hidden registers or buffers) can cause leakages.

The objective of this thesis is to study the impact of micro-architecture on the automated application of countermeasures against auxiliary channel attacks during compilation. A first axis is to study how to modify the way countermeasures are applied within the compiler to take into account precise leakage models that are micro-architecture aware, for example how to adapt the instruction selection or register allocation in the compiler depending on the leakage model. A second axis is to adapt the countermeasures themselves in order to better take into account the nature of the leakages, with the objective of improving the reduction of information leakage and thus improving the security/performance trade-off.

  • Keywords : Computer science and software, DACLE, Leti
  • Laboratory : DACLE / Leti
  • CEA code : SL-DRT-20-0921
  • Contact : nicolas.belleville@cea.fr
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