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Publications & Books

Publications & Books

​​​​​​​​List of latest publications and books

Published on 13 June 2024

 ​

​Books published by CEA-Leti scientists 





Olivier SAVRY, Thilas HISCOCK, Mustapha El MAJIHI


François SIMOENS




​Laurent DURAFFOURG and Julien ARCAMONE 


Badhise BEN BAKIR, Corrado SCIANCALEPORE, Antoine DESCOS, Hélène DUPREZ,
Damien BORDEL and Sylvie MENEZO 
​Edited by Dunod, in the series "Technique et Ingénierie" (french version).


‘Cameras’ chapter of the ‘Handbook of Terahertz Technologies: Devices and Applications’, edited by Ho-Jin Song & Tadao Nagatsuma, published by CRC Press
​Edited the book “Nanoelectromechanical
Systems” published by ISTE, WILEY, also in French with ISTE editions.


​With a chapter in the «Nanodevices for Photonics and Electronics: Advances and Applications” book published by CRC Press

​List of recent publications (2024)

  
Titre
Auteurs
Source
Résumé
DOI
Type de documents
Impact Factor
2018
high temperature stability and performance analysis of n-doped ge-se-sb based ots selector devices
Verdy,- A | Navarro,- G | Bernard,- M | Noe,- P | Bourgeois,- G | Garrione,- J | Cyrille,- M-c | Sousa,- V | Nowak,- E |
10th IEEE International Memory Workshop, IMW 2018 (pp 1-4)
In this paper, we investigate the stability at high temperature of N doped Ge-Se-Sb based Ovonic Threshold Switching selectors (OTS). Annealing temperatures up to 400°C are explored, compatible with IC Back-End-Of-Line temperature budget (BEOL). Thanks to electrical characterization and material physico-chemical analysis, we show how an annealing of 30 minutes at 400°C is beneficial for the reduction of the threshold voltage. Moreover, after such thermal budget, an ultra low leakage current of 0.1 nA at Vth/2 and an endurance of more than 1E8 cycles are still ensured. Electrical parameters and selector performance are then analyzed at stress temperatures up to 150°C, demonstrating the suitability of Ge-Se-Sb based OTS selector devices for BEOL integrations for applications targeting high temperature operating environments. © 2018 IEEE.
http://dx.doi.org/10.1109/IMW.2018.8388834
conference
0
2018
optimizing programming energy for improved rram reliability for high endurance applications
Sassine,- G | Alfaro robayo,- D | Nail,- C | Nodin,- J-f | Coignus,- J | Molas,- G | Nowak,- E |
10th IEEE International Memory Workshop, IMW 2018 (pp 1-4)
In this paper, we investigate RRAM endurance improvement by optimizing programming energy on HfO2/Ti OXRAM 1T1R kb arrays. SET and RESET programming patterns are optimized with programming current of 50muA, to minimize the energy provided to the system, maintaining sufficient widow margin on resistance distribution tails. Impact of both SET and RESET pattern on window margin is addressed. Programming scheme based on optimized ramp voltage patterns allows to improve maximum endurance of about 2 decades, to insure stable median window margin at 10 million cycles and to maintain window margin at 2sigma after one million cycles at 50muA. © 2018 IEEE.
http://dx.doi.org/10.1109/IMW.2018.8388843
conference
0
2018
phase-change memory: performance, roles and challenges
Navarro,- G | Bourgeois,- G | Kluge,- J | Serra,- Al | Verdy,- A | Garrione,- J | Cyrille,- M-c | Bernier,- N | Jannaud,- A | Sabbione,- C | Bernard,- M | Nolot,- E | Fillot,- F | Noe,- P | Fellouh,- L | Rodriguez,- G | Beugin,- V | Cueto,- O | Castellani,- N | Coignus,- J | Delaye,- V | Socquet-clerc,- C | Magis,- T | Boixaderas,- C | Barnola,- S | Nowak,- E |
10th IEEE International Memory Workshop, IMW 2018 (pp 1-4)
In this paper we analyze recent progress in Phase-Change Memory (PCM) technology targeting both Storage Class Memory and embedded applications. The challenge to achieve a high temperature data retention without compromising the device programming speed can be addressed by material engineering. We show that volume and thermal confinement improvement of the phase-change material enables a high (10-fold) reduction of the programming current, achieved also by the optimization of the device architecture, in particular in the case of a confined structure. It leads to a higher cell efficiency proven by a 6x reduction of the programming current density wrt a standard PCM structure. Furthermore, we demonstrate the reduction of thermal losses by the tuning of the thermal conductivity of the dielectrics surrounding the phase-change material. Finally, we propose some considerations about the PCM ultimate scaling and the reliability at such dimensions, showing that the engineering of the bottom electrode/phase-change material interface can lead to a reduced variability in scaled devices. © 2018 IEEE.
http://dx.doi.org/10.1109/IMW.2018.8388845
conference
0
2018
temperature limits of single and composite storage layer with different thicknesses and capping materials for p-stt-mram applications
Tillie,- L | Chatterjee,- J | Sousa,- R | Auffret,- S | Guelfucci,- J | Nowak,- E | Dieny,- B | Prejbeanu,- I-l | Lamard,- N |
10th IEEE International Memory Workshop, IMW 2018 (pp 1-4)
Perpendicular STT-MRAM temperature limits have been investigated in this paper by characterizing different simple and composite storage layer's thicknesses as well as different capping materials and annealing temperature conditions. Temperature measurements showed the importance of tuning precisely the thickness of the storage layer in order to choose between low consumption, high magnetic immunity, high working temperature, TMR and data retention in which the composite storage layer appeared to be the best compromise. The different thicknesses and stacks have then been compared to the main industrial applications to match thickness and performances. © 2018 IEEE.
http://dx.doi.org/10.1109/IMW.2018.8388854
conference
0
2018
sward: a secure wake-up radio against denial-of-service on iot devices
Montoya,- M | Molnos,- A | Bacles-min,- S | Fournier,- Jja |
11th ACM Conference on Security and Privacy in Wireless and Mobile Networks, WiSec 2018 (pp 190-195)
Wake-up radios are mechanisms that control the sleep and active modes of energy-constrained Internet of Things (IoT) nodes. These radios detect pre-determined wake-up tokens and switch the devices to an active state. Such systems are vulnerable to a kind of Denial-of-Service attacks called Denial-of-Sleep, where attackers continuously send wake-up tokens to deplete the battery of the nodes. We propose a protocol to mitigate these attacks that includes a novel solution to generate hard-to-guess wake-up tokens at every wake-up. Simulations show that under standard operating conditions, it has a negligible energy overhead (0.03%), while it increases the lifetime of an IoT node by more than 40 times under Denial-of-Sleep attack. Finally, we compare our protocol to related work against Denial-of-Sleep attacks, and explain why it is both more resilient and more energy-efficient than existing approaches. © 2018 Association for Computing Machinery.
http://dx.doi.org/10.1145/3212480.3212488
conference
0
2018
bedaquiline loaded lipid nanoparticles: a promising candidate for tb treatment
Jary,- D | Hibbitts,- A | Lozano-fernández,- T | Pérez,- D | Lucia,- A | Ainsa,- Ja | Rediriger,- N | Schaible,- Ue | Coya raboso,- Jm | Tailleux,- L | Gicquel,- B | Navarro,- F |
11th Annual TechConnect World Innovation Conference and Expo, Held Jointly with the 20th Annual Nanotech Conference and Expo,the 2018 SBIR/STTR Spring Innovation Conference, and the Defense TechConnect DTC Spring Conference Volume 3 (pp 59-62)
Four different kinds of Lipid Nanoparticles (LNP) encapsulating bedaquiline have been tested in order to evaluate the possibility to decrease adverse effects of this very efficient and recent antibiotic. The parameters that are studied among these different types of LNP are the surface charge as well as targeting of macrophages through trimannose groups grafted to the surface. It was found that these nanocarriers could encapsulate bedaquiline with a very high loading efficiency, exhibited a very good colloidal stability in storage conditions as well as in biological media, and an excellent compatibility with animal cells. Finally, first in vivo evaluation showed that these carriers are able to accumulate strongly in the lungs and that the almost neutral ones without targeting ligands could be the best candidate for tuberculosis treatment. © 2018 OOSV. All rights reserved.
unknown
conference
0
2018
mac design for 5g dense networks based on fbmc modulation
El chall,- R | Miscopein,- B | Kténas,- D |
12th EAI International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2017 Volume 228 (pp 310-321)
The fifth generation (5G) of wireless networks is currently under investigation in order to address the well-known challenges of the high capacity demands and traffic volume. The promising solutions to meet these targets can be achieved through ultra-densification, efficient use of spectrum and advanced filtered modulation techniques. In this paper, we present an enhanced MAC protocol for 5G small cells operating at 5 GHz and assuming an FBMC physical layer. The proposed MAC design consists of scheduled-based and contention-based access schemes and involves a listen before talk (LBT) procedure to comply with ETSI regulations. The performance of the proposed FBMC-MAC design is then evaluated in dense deployment scenarios under different PHY/MAC parameter settings. Moreover, we study the performance of FBMC-MAC systems in the context of coexistence with WiFi systems. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.
http://dx.doi.org/10.1007/978-3-319-76207-4_26
conference
0
2018
a flexible physical layer for lpwa applications
Mannoni,- V | Berg,- V | Dehmas,- F | Noguet,- D |
12th EAI International Conference on Cognitive Radio Oriented Wireless Networks, CROWNCOM 2017 Volume 228 (pp 322-333)
In the context of Low Power Wide Area (LPWA) networks, terminals are expected to be low cost, to be able to communicate over a long distance, and to operate on battery power for many years. In order to support a wide range of LPWA applications, the next generation of LPWA technologies is expected to provide faster throughput, be more resilient, and guarantee lower levels of latency for a similar battery lifetime. These contradictory requirements, lead to consider the design of a flexible physical layer with the aim to be efficient for the identified operating modes from “low data rate, low power consumption, long range” to “high data rate”. Performance of waveform candidates is assessed in terms of PER, range and also power consumption in order to obtain the best compromise between operating modes. A new flexible waveform based on frequency domain processing is finally proposed to address the large scale of requirements of new LPWA applications. © 2018, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.
http://dx.doi.org/10.1007/978-3-319-76207-4_27
conference
0
2018
2-bit reconfigurable circularly-polarized unit-cell at ka-band
Diaby,- F | Palma,- Ld | Clemente,- A | Dussopt,- L | Pham,- K | Fourn,- E | Sauleau,- R |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
We present here the design and numerical results of a circularly-polarized electronically reconfigurable unit-cell with a 2-bit phase resolution. This unit-cell, whose size (length x width x height) is 5.1x5.1x1.3 mm3, operates at Ka-band. It comprises six metal layers printed on three RT/Duroid 6002 dielectric substrates and two bonding films. Four p-i-n diodes are soldered on the two radiating elements printed on the top and bottom layers of the dielectric stack in order to control the transmission phase. Thus 0°, 90°, 180°, and 270° phase states are achieved by properly switching the p-i-n diodes. Fractional 3-dB transmission bandwidths of 10.3%, 12.4%, 9.7% and 13.1% have been achieved at 29 GHz for the 0°, 90°, 180°, and 270° phase states, respectively | while the insertion losses at 29 GHz varies between 1.1 dB and 1.3 dB. © 2018 Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
characterization of sub-thz and mmwave propagation channel for indoor scenarios
Pometcu,- L | D'errico,- R |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
This paper presents a radio channel characterization in the frequency band 126-156 GHz. Three indoor scenarios have been characterized: a laboratory, a conference room and an office. Double steering of antennas at the transmitting side and at the receiving side has been performed in order to cover the entire angular range from -180o to 180o. The channel model results obtained from the measured data are provided through the path loss and delay spread and are compared with the ones obtained in lower mm-wave bands. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
compact frequency reconfigurable magneto-electric crossed dipole in vhf band
Kaddour,- A-s | Bories,- S | Bellion,- A | Delaveaud,- C |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
Reducing the size of wideband antennas operating in the Very High Frequency band from 100 to 400 MHz is a great challenge. At 100 MHz, the wavelength size is 3 m and any size reduction makes the integration easier and reduces fabrication costs. The original technique proposed in this communication enables a significant height reduction (up to 50%) of a Magneto-electric crossed dipole (MECD) antenna while maintaining an ultra-wideband operation bandwidth from 92 to 360 MHz (118%). The proposed technique is based on adding frequency reconfigurable concept on a compact antenna. The profile reduction technique and simulated results are presented in this paper. © 2018 Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
design and optimization of a two-element huygens source based superdirective array
Debard,- A | Clemente,- A | Delaveaud,- C | Djoma,- C | Potier,- P | Pouliguen,- P |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
It is well known from previous works, that a maximum directivity close to P2 + 2P could be obtained when P Huygens sources are used to implement compact end-fire arrays with reduced inter-element distance (e.g. < 0.3lambda). This result has been theoretically demonstrated with infinitesimal Huygens sources, but practical antenna architectures are not yet presented. In this paper, a method to design Huygens source based superdirective arrays is numerically demonstrated through full-wave electromagnetic simulations considering a two-element array with an inter-element distance equal to 0.2lambda and kr0 = 1.33 (where r0 indicates the radius of the minimum sphere enclosing the antenna). The strong mutual coupling between the array elements is taken into account in the optimization procedure based on spherical wave expansion. End-fire directivity and gain equal to 8.7 and 7.8 dBi have been respectively obtained. These results have also been compared to the case of the two-element arrays based on magnetic and electrical dipoles. © 2018 Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
design of a monopolar wire-plate antenna loaded with magneto-dielectric material
Batel,- L | Pintos,- J-f | Delaveaud,- C |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
This article proposes to evaluate the performances of an electrically small Monopolar Wire-Plate (MWP) antenna designed with a Magneto-Dielectric Material (MDM). Changing the characteristics, the volume or the position of the material highlights a particular behavior towards MWP antenna miniaturization. A reduced volume of MDM with a suitable material's position on the antenna leads to a good compromise between antenna miniaturization and radiation performances. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
frequency reconfigurable dual narrow band antenna matched on the low band lte fdd physical layer
Bories,- S | Sarrazin,- F | Giry,- A |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
The upcoming widening of the LTE frequency Low Band (LB) towards 600 MHz imposes a strong miniaturization effort to the smartphone antenna which can no more maintain its radiation efficiency performance over the full 600-960 MHz range. To overcome this issue, the design strategy consists in matching the antenna only where it is instantaneously used. Thus, based on the FDD spectrum usage, the proposed antenna presents two narrow bands that can be reconfigured independently anywhere in the whole LTE LB. The proposed design takes into account current limitations of the tunable capacitor (low Q factor). The measured total efficiency increases with frequency from 11% at 617 MHz to 60% at 960 MHz. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
k/ka-band transmitarray antennas based on polarization twisted unit-cells
Pham,- K | Sauleau,- R | Fourn,- E | Diaby,- F | Clemente,- A | Dussopt,- L |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
This paper presents a dual-band dual linearly polarized transmitarray unit-cell designed for satellite communications in K/Ka-band (down link: 18.8-21 GHz | up-link: 27.5-31 GHz). Single-band unit-cells with linear orthogonal polarizations are firstly designed separately in each band. Their frequency response shows a -10-dB impedance bandwidth of more than 9% around 29 GHz and 19.5 GHz, with a 180° phase-shift in both bands. Those unit-cells are optimized with the same periodicity (6 mm, which is equivalent to 0.58-wavelength in free space at 29 GHz). The extremely low mutual coupling between these unit-cells allows designing a dual-band transmitarray by simply interleaving two single-band sub-arrays operating in the up- and down-links. Single- and dual-band transmitarray antennas are designed to validate the proposed concepts and demonstrate that they exhibit similar radiation performance in both bands, thereby proving the relevance of the proposed interleaving technique. Experimentally, the maximum gain obtained at 29 GHz and 19.5 GHz for a beam pointing at boresight reaches 26 dBi and 23 dBi respectively, with a side lobe level better than -20 dB at both frequencies. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
millimeter-wave circularly-polarized substrate-integrated planar discrete lens
Medrar,- K | Marnat,- L | Dussopt,- L |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
A new planar and compact substrate-integrated discrete lens is proposed to achieve high gain and circular polarization in V-band. The antenna is composed of a planar discrete lens based on novel unit cells converting linear to circular polarization and a linearly polarized focal source. Both elements are mounted on the top and bottom sides of a core dielectric, providing more robustness and compactness while avoiding alignment issues and expensive fabrication processes. The measurement results demonstrate a broadside gain of 20.5 dBi at 61.1 GHz and a 3-dB gain bandwidth of 14.1%. © 2018 Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
on the frequency dependency of radio channel's delay spread: analyses and findings from mmmagic multi-frequency channel sounding
Nguyen,- Slh | Medbo,- J | Peter,- M | Karttunen,- A | Haneda,- K | Bamba,- A | D'errico,- R | Iqbal,- N | Diakhate,- C | Conrat,- J-m |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
This paper analyzes the frequency dependency of the radio propagation channel's root mean square (rms) delay spread (DS), based on the multi-frequency measurement campaigns in the mmMAGIC project. The campaigns cover indoor, outdoor, and outdoor-to-indoor (O2I) scenarios and a wide frequency range from 2 to 86 GHz. Several requirements have been identified that define the parameters which need to be aligned in order to make a reasonable comparison among the different channel sounders employed for this study. A new modelling approach enabling the evaluation of the statistical significance of the model parameters from different measurements and the establishment of a unified model is proposed. After careful analysis, the conclusion is that any frequency trend of the DS is small considering its confidence intervals. There is statistically significant difference from the 3GPP New Radio (NR) model TR 38.901, except for the O2I scenario. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
wideband vehicle to pedestrian propagation channel characterization and modeling
Makhoul,- G | D'errico,- R | Oestges,- C |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
This paper presents a wide-band vehicle to pedestrian (V2P) channel model based on a measurement campaign carried out at 3.8 GHz. Several propagation conditions and different mobility patterns were investigated. A geometry-based stochastic channel model (GSCM) is proposed for line of sight (LoS) scenarios. The main path and secondary discrete components are modeled in terms of path loss (PL), large and small scale fadings. © Institution of Engineering and Technology.All Rights Reserved.
unknown
conference
0
2018
wideband low-profile transmitarray antenna for backhauling at 60 ghz
Smierzchalski,- M | Clemente,- A | Huchard,- M | Barbier,- C |
12th European Conference on Antennas and Propagation, EuCAP 2018 Volume 2018 Issue CP741
A low profile transmitarray architecture composed of a four profiled focal sources and a flat-lens array is discussed in this paper. The flat-lens is a square array with 2116 unit-cells disposed on a 46x46 element regular grid. Considering the proposed focal system, the focal distance is equal to 44.6 mm (F/D ratio equal to 0.39), which must be compared to a F/D ratio equal to 0.7 corresponding to the case of a transmitarray with classical focal sources with a gain of 10 - 12 dBi. The flat-lens array is based on seven unit-cells with a relative phase-shift around 45° and a transmission coefficient higher than -1.8 dB in the frequency band 57 - 66 GHz (14.6% at 61.5 GHz). The full-array has been optimized using an ad-hoc tool and results compared to full-wave simulations. A maximum gain of 36 dBi has been obtained including the impact of the waveguide power divider. The 1-dB and 3-dB gain bandwidth are equal to 13.4% and 23.2%, respectively. © 2018 Institution of Engineering and Technology. All Rights Reserved.
unknown
conference
0
2018
sige oxidation kinetics and oxide density measured by resonant soft x-ray reflectivity
Roze,- F | Gergaud,- P | Jaouen,- N | Gourhant,- O | Blanquet,- E | Bertin,- F | Juhel,- M | Abbate,- F | Pribat,- C | Campidelli,- Y |
12th IEEE Nanotechnology Materials and Devices Conference, NMDC 2017 Volume 2018-January (pp 177-178)
Ultrathin compressively strained SiGe layers is one of the most promising materials for high mobility channels of p-type Metal Oxide Semiconductor Field Effect Transistors (pMOSFETs). Fabrication of such layers as well as formation of high-quality gate oxides on SiGe both involve SiGe thermal oxidation processes. These processes require well-controlled oxidation kinetics and oxide properties. This work discusses oxidation kinetics of SiGe in light of the characterization of the thermal oxide density by the Resonant Soft X-Ray Reflectivity (R-SoXR) technique. © 2017 IEEE.
http://dx.doi.org/10.1109/NMDC.2017.8350545
conference
0
2018
towards a scalable quantum computer
Almudever,- Cg | Khammassi,- N | Hutin,- L | Vinet,- M | Babaie,- M | Sebastiano,- F | Charbon,- E | Bertels,- K |
13th IEEE International Conference on Design and Technology of Integrated Systems In Nanoscale Era, DTIS 2018
A quantum machine may solve some complex problems that are intractable for even the most powerful classical computers. By exploiting quantum superposition and entanglement phenomena, quantum algorithms can achieve from polynomial to exponential speed up when compared to their best classical counterparts. A quantum computer will be a part of a heterogeneous, multi-core computer in which a classical processor will interact with several accelerators such as FPGAs, GPUs and also a quantum co-processor. Figure 1 shows the different layers of the quantum computer system stack [1]. Building such a quantum system requires contributions from different fields such as physics, electronics, computer science and computer engineering for addressing the following challenges: i) build scalable quantum chips integrating qubits with long coherence times and high-fidelity operations, ii) develop classical control electronics at possibly cryogenic temperatures and iii) create the microarchitecture as well as the software for quantum computation. © 2018 IEEE.
http://dx.doi.org/10.1109/DTIS.2018.8368579
conference
0
2018
early estimation of aging in the design flow of integrated circuits through a programmable hardware module
Sandionigi,- C | Altieri,- M | Heron,- O |
13th IEEE International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology Systems, DFT 2017 Volume 2018-January (pp 1-6)
Integrated circuits' aging is recognized as a key reliability bottleneck and its estimation at design time becomes mandatory to guarantee performance and lifetime of the circuit. Current approaches for the estimation of aging rely on simulation tools which integrate aging models implemented as equations or look-up tables. Nevertheless, the difficulty in knowing the technological parameters involved in the estimation of aging and the necessity of accurate aging models make the modelling of the aging effects a long and hard process. This paper presents a novel solution to estimate the timing degradation on a circuit under aging conditions without the need of characterizing the aging-related technological parameters and without aging models. The solution is based on a programmable hardware module that allows observing the impact of aging directly on the paths of the circuit on a selected technology. The preliminary experimental results prove the feasibility of the solution. © 2017 IEEE.
http://dx.doi.org/10.1109/DFT.2017.8244451
conference
0
2018
low power locking detector for frequency calibration of multi-frequency injection locked oscillators
Boulmirat,- A | Jany,- C | Siligaris,- A | Jimenez,- Jlg |
14th Conference on Ph.D. Research in Microelectronics and Electronics, PRIME 2018 (pp 189-192)
This paper presents a locking detector used as a first stage in the frequency calibration techniques for Multi-Frequency Injection Locked Oscmators (MFILO). It provides a high detection level and relaxes design constraints on the calibration circuit that follows. This technique will allow lower levels of power consumption with smaller occupied area for the frequency calibration circuits. © 2018 IEEE.
http://dx.doi.org/10.1109/PRIME.2018.8430310
conference
0
2018
x band distributed phase shifter based on sol-gel bctz varactors
Mercier,- D | Niembro-martin,- A | Sibuet,- H | Baret,- C | Chautagnat,- J | Dieppedale,- C | Bonnard,- C | Guillaume,- J | Le rhun,- G | Billard,- C | Gardes,- P | Poveda,- P |
14th European Microwave Conference, EURAD 2017 Volume 2018-January (pp 382-385)
This paper presents the first phase shifter based on sol-gel Barium Calcium Zirconate Titanate (BCTZ) thin ferroelectric film. It is a coplanar waveguide distributed phase shifter with BCTZ varactors used as tuning elements. It presents a continuous phase shift of 285° at 12 GHz (180° at 8 GHz) with a 20 V bias voltage. Its figure of merit is 26°/dB and its return loss is better than 12 dB for the 8 to 12 GHz frequency bandwidth. The presented phase shifter is the only phase shifter based on low cost sol-gel deposition to compete with the best reported X band ferroelectric phase shifters. © 2017 European Microwave Association.
http://dx.doi.org/10.23919/EURAD.2017.8249227
conference
0
2018
design of a 2-bit unit-cell for electronically reconfigurable transmitarrays at ka-band
Diaby,- F | Clemente,- A | Di palma,- L | Dussopt,- L | Pham,- K | Fourn,- E | Sauleau,- R |
14th European Microwave Conference, EURAD 2017 Volume 2018-January (pp 473-476)
This paper presents in detail the design of a linearly-polarized electronically reconfigurable unit-cell for transmitarray antennas with a 2-bit phase resolution in Ka-band. The size of the proposed unit-cell is 5.1×5.1×1.3 mm3. It is implemented on a dielectric stack-up composed of six metal layers, three dielectric substrates and two bonding films. The radiating elements are printed on both external metallic layers and are loaded by two PIN diodes controlling the transmission phase. This unit-cell is used to design a 196-element transmitarray with 784 PIN diodes. The performance of this 2-bit transmitarray has been evaluated numerically using our in-house simulation tool and compared to a transmitarray with a 1-bit phase quantization. A maximum gain of 22.9 dBi, an aperture efficiency of 32.3%, and a side-lobe level equal to -18.1 dB at broadside have been obtained at 29 GHz. © 2017 European Microwave Association.
http://dx.doi.org/10.23919/EURAD.2017.8249250
conference
0
2018
energy-efficient 4t sram bitcell with 2t read-port for ultra-low-voltage operations in 28 nm 3d monolithic coolcubetm technology
Boumchedda,- R | Noel,- J-p | Giraud,- B | Makosiej,- A | Rios,- Ma | Esmanhotto,- E | Bourde-cicé,- E | Bellet,- M | Turgis,- D | Beigne,- E |
14th IEEE/ACM International Symposium on Nanoscale Architectures, NANOARCH 2018 (pp 131-137)
This paper presents a 4T-based SRAM bitcell optimized both for write and read operations at ultra-low voltage (ULV). The proposed bitcell is designed to respond to the requirements of energy constrained systems, as in the case of most IoT-oriented circuits and applications. The use of 3D CoolCubeTM technology enables the design of a stable 4T SRAM bitcell by using data-dependent back biasing. The proposed bitcell architecture provides a major reduction of the write operation energy consumption compared to a conventional 6T bitcell. A dedicated read port coupled to a virtual GND (VGND) ensures a full functionality at ULV of read operations. Simulation results show reliable operations down to 0.35 V close to six sigma (6 i) without any assist techniques (e.g. negative bitlines), achieving in worst case corner 300 ns and 125 ns in write and read access time, respectively. A 6x energy consumption reduction compared to a ULV ultra-low-leakage (ULL) 6T bitcell is demonstrated. © 2018 Association for Computing Machinery.
http://dx.doi.org/10.1145/3232195.3232210
conference
0
2018
datajoin: an energy-efficient joining scheme for 802.15.4e tsch networks
Morin,- E | Maman,- M | Guizzetti,- R | Duda,- A |
14th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2018 Volume 2018-October
This paper considers the problem of a node joining an existing 802.15.4e TSCH network. We propose DataJoin, an energy-efficient scheme based on two ideas: i) it schedules the transmission of enhanced beacon frames in a smart way by taking advantage of the information on the common TSCH schedule and ii) it piggybacks the next beacon transmission times onto some acknowledgment frames to allow a joining node to overhear this information.We compare DataJoin with the Baseline scheme that corresponds to the state-of-the-art protocol for joining TSCH networks. Simulation comparisons show lower energy consumption by the joining node under DataJoin along with similar joining delays and average network energy consumption for both schemes. © 2018 IEEE.
http://dx.doi.org/10.1109/WiMOB.2018.8589149
conference
0
2018
massive deployment evaluation of adaptive lpwa networks using turbo-fsk
Guizar,- A | Filho,- Ls | Maman,- M | Mannoni,- V |
14th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2018 Volume 2018-October
Originally, Low Power Wide Area (LPWA) Networks were predetermined for long range, low power and low data rate transmissions. The existing LPWA technologies trade-off by definition between these parameters and therefore, they can not cover the different scenarios of Machine-to-Machine communications. Moreover, heterogeneity and large-scale are still two main challenges that are not always considered in LPWA studies. In this paper, we evaluate different massive deployment strategies using a flexible radio based on Turbo-FSK: selfish approach where each node selects its own configuration according to its needs and centralized approach where the Base Station selects the best strategies to improve the network performance. Then, we evaluate these deployments with large-scale simulations in terms of reliability, network capacity, battery lifetime and end-to-end latency. The results show the advantages and drawbacks of homogeneous and heterogeneous deployments in different LPWA contexts (e.g., Smart Metering and Agri-systems). © 2018 IEEE.
http://dx.doi.org/10.1109/WiMOB.2018.8589092
conference
0
2018
large scale lora networks: from homogeneous to heterogeneous deployments
Ochoa,- Mn | Suraty,- L | Maman,- M | Duda,- A |
14th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob 2018 Volume 2018-October (pp 192-199)
LoRa technology has emerged as an interesting solution for Low Power Wide Area (LPWA) applications. The main LPWA research directions are about large scale networks to support massive number of devices, interference issues, link optimization and adaptability. Thus heterogeneous network deployments and Spreading Factor (SF) allocation strategies need to be studied. In this paper, we investigate the performance of homogeneous networks (i.e. when all the nodes select the same LoRa configuration) and heterogeneous networks (i.e. when each node selects its LoRa configuration according to its link budget or their needs) for large scale deployments (up to 10000 nodes per gateway). For that purpose we have developed a LoRa Module, based on improved WSNet simulator, including a spectrum usage abstraction, the co-channel rejection due to the quasi-orthogonality of SFs and the gateway capture effect. Simulation results show the performance comparison in terms of reliability, network capacity and power consumption for homogeneous and heterogeneous deployments as a function of the number of nodes and the traffic intensity. The comparison shows the benefits of the heterogeneous deployment where each node selects its configuration according to its link budget. © 2018 IEEE.
http://dx.doi.org/10.1109/WiMOB.2018.8589080
conference
0
2018
customized chemical compositions adaptable for cleaning virtually all post-etch residues
Cazes,- M | Pizzetti,- C | Daviot,- J | Garnier,- P | Broussous,- L | Gabette,- L | Besson,- P |
14th International Symposium on Ultra Clean Processing of Semiconductor Surfaces, UCPSS 2018 Volume 282 SSP (pp 121-125)
A post-etch residue cleaning formulation, based on balancing the aggressiveness of hydrofluoric acid with its well-known residue removal properties is introduced. In a series of investigations originally motivated by the cleaning challenge provided by high-k dielectric-based residues, a formulation platform is developed that successfully cleans residues resulting from the plasma patterning of tantalum oxide and similar materials while maintaining metal and dielectric compatibility. It is further shown that the fundamental advantages of this solution can be extended to the cleaning of other, more traditional post-etch residues, with no sacrifice in compatibility, as demonstrated by measurements on blanket films and through SEM data. © 2018 Trans Tech Publications, Switzerland.
http://dx.doi.org/10.4028/www.scientific.net/SSP.282.121
conference
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