Institut supérieur d'électronique et du numérique

About: Institut supérieur d'électronique et du numérique is a education organization based out in Lille, France. It is known for research contribution in the topics: CMOS & Filter (video). The organization has 192 authors who have published 223 publications receiving 2845 citations.

Sliding-Mode Formation Control for Cooperative Autonomous Mobile Robots

Abstract: This paper considers the control of a group of autonomous mobile robots. A coordinated control scheme based on a leader-follower approach is developed to achieve formation maneuvers. First and second order sliding-mode controllers are proposed for asymptotically stabilizing the vehicles to a time-varying desired formation. The latter controller, based on the relative motion states, eliminates the need for measurement or estimation of the leader velocity. It enables formation stabilization using a vision system carried by the followers and ensures the collision avoidance from the initial time instance. Experimental investigation has been conducted using a test bench made of three nonholonomic mobile robots in order to demonstrate the effectiveness of the proposed strategy.

A 1kpixel CMOS camera chip for 25fps real-time terahertz imaging applications

Abstract: Future imaging applications in the submillimeter-Wave range (300GHz to 3THz) require RF systems that can achieve high sensitivity and portability at low power consumption levels. In particular, CMOS process technologies are attractive due to their low price tag for industrial, surveillance, scientific, and medical applications. Recently, CMOS-based detectors have shown good sensitivity up to 1THz with NEPs on the order of 66pW/√(Hz) at 1THz [1]. However, CMOS terahertz imagers developed thus far have only operated single detectors based on lock-in measurement techniques to acquire raster-scanned images with frame rates on the order of minutes [2]. To address these impediments, we present a low-power 1kpixel terahertz camera chip fully compliant with an industrial 65nm f t /f max =160GHz/200GHz CMOS process technology. The active-pixel circuit topology is designed to accommodate the optics for wide bandwidth (0.6 to 1THz) in stand-off detection with a 40dBi Si-lens. It includes row/col select and integrate-and-dump circuitry capable of capturing terahertz images with video frame rates up to 25fps at a power consumption of 2.5μW/pixel.

Exploring underwater target detection by imaging polarimetry and correlation techniques

Abstract: Underwater target detection is investigated by combining active polarization imaging and optical correlation-based approaches. Experiments were conducted in a glass tank filled with tap water with diluted milk or seawater and containing targets of arbitrary polarimetric responses. We found that target estimation obtained by imaging with two orthogonal polarization states always improves detection performances when correlation is used as detection criterion. This experimentally study illustrates the potential of polarization imaging for underwater target detection and opens interesting perspectives for the development of underwater imaging systems.

Thiophene-based push–pull chromophores for small molecule organic solar cells (SMOSCs)

Abstract: The last decade has witnessed rapid progress in organic photovoltaics boosted by the design and synthesis of novel π-conjugated small donor–acceptor molecules (mainly thiophene-based chromophores) and by the control and optimization of both device processing and fabrication. Although some important progress has been reached, current challenges remain to further improve their efficiency, durability and cost-effectiveness in order to compete with silicon-based solar cells. This review will provide the scientific community with both general and in depth information on the structure–property relationships related to the photocurrent efficiencies comprising detailed I/V characteristics. It will highlight guidelines for designing new efficient and emerging alternatives to conjugated polymers on the basis of thiophenic chromophores representing, to date, the most widely used class of organic materials for such a purpose as well as important information on device processing or fabrication factors that could influence their performances.

An All-Digital RF Signal Generator Using High-Speed $\Delta\Sigma$ Modulators

Abstract: An all-digital RF signal generator using DeltaSigma modulation and targeted at transmitters for mobile communication terminals has been implemented in 90 nm CMOS. Techniques such as redundant logic and non-exact quantization allow operation at up to 4 GHz sample rate, providing a 50 MHz bandwidth at a 1 GHz center frequency. The peak output power into a 100 Omega diff. load is 3.1 dBm with 53.6 dB SNDR. By adjusting the sample rate, carriers from 50 MHz to 1 GHz can be synthesized. RF signals up to 3 GHz can be synthesized when using the first image band. As an example, UMTS standard can be addressed by using a 2.6 GHz clock frequency. The measured ACPR is then 44 dB for a 5 MHz WCDMA channel at 1.95 GHz with output power of -16 dBm and 3.4% EVM. At 4 GHz clock frequency the total power consumption is 120 mW (49 mW for DeltaSigma modulator core) on a 1 V supply voltage, total die area is 3.2 mm2 (0.15 mm2 for the active area).