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Se buscan candidatos/as para un contrato predoctoral para la formación de doctores en el área de Tecnología Electrónica y de Comunicaciones asociada al Proyecto de Investigación TOGETHER (Dispositivos, circuitos y arquitecturas fiables y de bajo consumo para IoT).  [+ info] »
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Últimas publicaciones
A switched-capacitor skew-tent map implementation for random number generation  »
Piecewise linear one-dimensional maps have been proposed as the basis for low-power analog and mixed-signal true random number generators (TRNGs). Recent research has moved towards conceiving maps that operate robustly under the consideration of parameter variations. In this paper, we introduce an oscillator circuit mapping a low-complexity map known as the skew-tent. This oscillator is employed as the basis for a TRNG scheme. Simulation results in TSMC 0.18 μm validate the chaotic oscillator and the randomness of the TRNG scheme is verified with the NIST test suite 800-22.

Journal Paper - International Journal of Circuit Theory and Applications, vol. 45, no. 2, pp 305-315, 2017 JOHN WILEY & SONS
DOI: 10.1002/cta.2305    ISSN: 0098-9886    » doi
J.L. Valtierra, E. Tlelo-Cuautle and A. Rodriguez-Vazquez
Guest Editorial 'Secure lightweight crypto-hardware'  »
Abstract not avaliable

Journal Paper - International Journal of Circuit Theory and Applications, vol. 45, no. 2, pp 143-144, 2017 JOHN WILEY & SONS
DOI: 10.1002/cta.2302    ISSN: 0098-9886    » doi
A.J. Acosta and T. Addabbo
Incubating terns modify risk-taking according to diurnal variations in egg camouflage and ambient temperature  »
Studies of risk-taking by breeding birds have frequently addressed the effect of brood value on the decisions taken by incubating birds when predators approach their nests. However, leaving eggs unattended during predator disturbance may expose embryos to other potentially harmful factors, to which parent birds should respond when making decisions about when to leave or return to their nest. In this study, we show that diurnal changes in flushing behaviour of incubating terns from nests during predator approach were affected by egg camouflage, the terns allowing a closer approach to individual nests when the eggs appeared better camouflaged. Return times to the nests were affected by ambient temperature, with the terns shortening such times at high ambient temperatures, thus diminishing the risk of egg overheating. As a whole, our results show that the decisions of the birds on when to leave or return to their nests depended on shifting payoffs, as a consequence of diurnal variations in both the thermal risks incurred by embryos and egg crypsis. Environmental costs of risk-taking, such as those considered here, should be addressed in studies of risk-taking by breeding birds. This type of study may have implications for our knowledge of cognitive processes that affect risk-taking.

Journal Paper - Behavioral Ecology and Sociobiology, vol. 71, no. 4, 2017 SPRINGER
DOI: 10.1007/s00265-017-2306-4    ISSN: 0340-5443    » doi
J.A. Amat, J. Gómez, G. Liñán-Cembrano, M.A. Rendón and C. Ramo
Parametric macromodeling of integrated inductors for RF circuit design  »
Nowadays, parametric macromodeling techniques are widely used to describe electromagnetic structures. In this contribution, the application of such parametric macromodeling techniques to the design of integrated inductors and radio-frequency circuit design is investigated. In order to allow such different operations, a new modeling methodology is proposed, which improves the modeling accuracy when compared to former techniques. The new methodology is tailored to the unique characteristics of the devices under study. The obtained parametric macromodel is then used in a synthesis methodology and in the design of a voltage controlled oscillator in a 0.35-μm CMOS technology.

Journal Paper - Microwave and Optical Technology Letters, vol. 59, no. 5, pp 1207-1212, 2017 JOHN WILEY & SONS
DOI: 10.1002/mop.30498    ISSN: 1098-2760    » doi
F. Passos, Y. Ye, D. Spina, E. Roca, R. Castro-López, T. Dhaene and F.V. Fernández
A CMOS Digital SiPM with Focal-Plane Light-Spot Statistics for DOI Computation  »
Silicon photomultipliers can be used to infer the depth-of-interaction (DOI) in scintillator crystals. DOI can help to improve the quality of the positron emission tomography images affected by the parallax error. This paper contemplates the computation of DOI based on the standard deviation of the light distribution. The simulations have been carried out by GAMOS. The design of the proposed digital silicon photomultiplier (d-SiPM) with focal plane detection of the center of mass position and dispersion of the scintillation light is presented. The d-SiPM shares the same off-chip time-to-digital converter such that each pixel can be individually connected to it. A miniature d-SiPM 8×8 single-photon avalanche-diode (SPAD) array has been fabricated as a proof of concept. The SPADs along each row and column are connected through an OR combination technique. It has 256×256μm2 without peripherals circuits and pads. The fill factor is about 11%. The average dark count rate of the mini d-SiPM is of 240 kHz. The average photon detection efficiency is 5% at 480 nm wavelength, room temperature, and 0.9 V excess voltage. The dynamic range is of 96 dB. The sensor array features a time resolution of 212 ps. The photon-timing SNR is 81 dB. The focal plane statistics of the light-spot has been proved as well by measurements.

Journal Paper - IEEE Sensors Journal, vol. 17, no. 3, pp 632-643, 2017 IEEE
DOI: 10.1109/JSEN.2016.2632200    ISSN: 1530-437X     » doi
I. Vornicu, F.N. Bandi and R. Carmona-Galán

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