{"id":233892,"date":"2015-08-05T22:00:00","date_gmt":"2015-08-05T22:00:00","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/la-nasa-prepare-des-circuits-pour-explorer-venus\/"},"modified":"2015-08-05T22:00:00","modified_gmt":"2015-08-05T22:00:00","slug":"la-nasa-prepare-des-circuits-pour-explorer-venus","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/la-nasa-prepare-des-circuits-pour-explorer-venus\/","title":{"rendered":"La NASA pr\u00e9pare des circuits pour explorer V\u00e9nus"},"content":{"rendered":"<p>Pour Jim Holmes directeur de la technologie de Ozark IC et ancien de Texas Instruments : &quot;Nous sommes reconnaissants &agrave; la National Science Foundation [NSF] d&rsquo;avoir financer Ozark IC pour cr&eacute;er un PDK 350 degr&eacute;s&deg;C . Notre succ&egrave;s avec la NSF PDK a incit&eacute; la NASA &agrave; nous suivre avec un projet en deux phases, afin de construire un PDK 500&deg;C pour les puces devant &ecirc;tre utilis&eacute;es dans la navigation du robot sur V&eacute;nus.&quot;<\/p>\n<p>Comme c&rsquo;est l&rsquo;environnement le plus hostile du syst&egrave;me solaire, la NASA esp&egrave;re supplanter les sondes russes et japonaises dans leurs explorations de V&eacute;nus, qui n&rsquo;ont pas r&eacute;sist&eacute; plus de quelques heures avant d&rsquo;&eacute;chouer. Dans la premi&egrave;re phase du projet, Ozark IC va devoir prouver &ecirc;tre capable d&rsquo;am&eacute;liorer la PDK 350 degr&eacute;s fabriqu&eacute;e chez Raytheon Systems au Royaume-Uni, o&ugrave; elle est appel&eacute;e Hit-SiC CMOS 500 &deg;C.<\/p>\n<hr \/>\n<p>La NASA souhaite disposer d&rsquo;un imageur ultraviolet fiable pour des exp&eacute;riences de composition plan&eacute;taires, en particulier pour l&rsquo;&eacute;tude de l&rsquo;environnement sur V&eacute;nus.<\/p>\n<p><img decoding=\"async\" width=\"250\" border=\"0\" height=\"206\" align=\"left\" data-src=\"\/sites\/default\/files\/images\/nasa-robot-va-nus.jpg\" style=\"--smush-placeholder-width: 250px; --smush-placeholder-aspect-ratio: 250\/206;border: 0px solid\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" \/>La deuxi&egrave;me partie consiste &agrave; r&eacute;aliser un microcontr&ocirc;leur programmable en temps r&eacute;el pour le robot d&rsquo;exploration sur V&eacute;nus ( photo ci-contre). Le professeur Alan Mantooth de l&rsquo;Universit&eacute; de l&rsquo;Arkansas, dirigera l&rsquo;&eacute;tude avec l&rsquo;aide de son groupe de doctorants.<\/p>\n<p>Une des cl&eacute;s pour surmonter les obstacles &agrave; 500&deg;C est le substrat. Ozark IC a choisi le carbure de silicium et utilis&eacute; des proc&eacute;d&eacute;s standard de silicium au-dessus de la plaquette supportant les transistors et autres dispositifs actifs. Toutefois, l&rsquo;interconnexion en aluminium est trop instable car ce m&eacute;tal fond &agrave; 632&deg;C. De m&ecirc;me le cuivre qui r&eacute;agit mal aux pressions &eacute;lev&eacute;es sur V&eacute;nus (9 millions de Pascal par rapport &agrave; 101 000 Pascal sur Terre). Jim Holmes pr&eacute;tend avoir une solution pour les couches de m&eacute;tallisation des circuits Venus-compatibles, mais la soci&eacute;t&eacute; en garde le secret pour le moment.<\/p>\n<p><em>Lorsqu&rsquo;on l&rsquo;on demande quels sont les ingr&eacute;dients cl&eacute;s qui permettent &agrave; la puce de r&eacute;sister avec succ&egrave;s aux 500&deg;C, Alan Mantooth, d&eacute;clare<\/em> :<\/p>\n<p>Il y a plusieurs ingr&eacute;dients cl&eacute;s. Le premier est un proc&eacute;d&eacute; bas&eacute; sur un semiconducteur auquel s&rsquo;ajoutent des oxydes et une m&eacute;tallisation capable de r&eacute;sister &agrave; cette temp&eacute;rature extr&ecirc;me. Nous avons con&ccedil;u un carbure de silicium avec des oxydes et des m&eacute;taux sp&eacute;ciaux. Ensuite, il faut avoir de bons mod&egrave;les produits coupl&eacute;s avec des m&eacute;thodes de conception compens&eacute;es en temp&eacute;rature. Nous avons &eacute;largi la tenue en temp&eacute;rature de transistor FET en utilisant certaines de nos m&eacute;thodes afin de pouvoir pr&eacute;dire la performance des circuits &agrave; des temp&eacute;ratures tr&egrave;s &eacute;lev&eacute;es. M&ecirc;me ainsi, nous devons concevoir des r&eacute;f&eacute;rences et des circuits d&rsquo;essais compens&eacute;s en temp&eacute;rature en utilisant des techniques qui contribuent &agrave; att&eacute;nuer les trop grandes variations de temp&eacute;rature. Les caract&eacute;ristiques des circuits varient &agrave; ces temp&eacute;ratures &eacute;lev&eacute;es, mais elles restent dans les plages de fonctionnement d&eacute;sir&eacute;es. <\/p>\n<p>L&rsquo;Universit&eacute; de l&rsquo;Arkansas b&eacute;n&eacute;ficie &eacute;galement d&rsquo;une importante expertise en bo&icirc;tiers avec son Centre de Recherche sur la Haute Densit&eacute;. Les interconnexions sur la puce comme avec la carte ont d&eacute;j&agrave; &eacute;t&eacute; con&ccedil;ues et caract&eacute;ris&eacute;es pour les circuits jusqu&rsquo;&agrave; 350&deg;C. Leurs caract&eacute;ristiques vont d&egrave;s &agrave; pr&eacute;sent &ecirc;tre &eacute;tendues &agrave; 500&deg;C.<\/p>\n<p><a href=\"http:\/\/www.ozarkic.com\/\">http:\/\/www.ozarkic.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La surface de V\u00e9nus qui avoisine les 500 \u00b0C est tellement chaude qu&rsquo;elle transforme le plomb et l&rsquo;aluminium en une parfaite bouillie. Cette situation a incit\u00e9 la NASA \u00e0 se tourner vers la soci\u00e9t\u00e9 Ozark IC, un fabricant de circuits, sp\u00e9cialiste des temp\u00e9ratures extr\u00eames, hautes ou basses. Ozark IC (Fayeville Arkansas) issue d&rsquo;essaimage de l&rsquo;universit\u00e9 de l&rsquo;Arkansas, a d\u00e9velopp\u00e9 un \u00ab\u00a0Process Design Kit (PDK) 500\u00b0C.\u00a0\u00bb <\/p>\n","protected":false},"author":22,"featured_media":233893,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"domains":[47],"ppma_author":[1149],"class_list":["post-233892","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","domains-electronique-eci"],"acf":[],"yoast_head":"<title>La NASA pr\u00e9pare des circuits pour explorer V\u00e9nus ...<\/title>\n<meta name=\"description\" content=\"La surface de V\u00e9nus qui avoisine les 500 \u00b0C est tellement chaude qu&#039;elle transforme le plomb et l&#039;aluminium en une parfaite bouillie. 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