{"id":226866,"date":"2013-04-16T22:00:00","date_gmt":"2013-04-16T22:00:00","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/recepteur-rf-a-echantillonnage-i-q-a-pre-distorsion-numerique\/"},"modified":"2013-04-16T22:00:00","modified_gmt":"2013-04-16T22:00:00","slug":"recepteur-rf-a-echantillonnage-i-q-a-pre-distorsion-numerique","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/recepteur-rf-a-echantillonnage-i-q-a-pre-distorsion-numerique\/","title":{"rendered":"R\u00e9cepteur RF \u00e0 \u00e9chantillonnage I\/Q \u00e0 pr\u00e9-distorsion num\u00e9rique"},"content":{"rendered":"

En raison des demandes croissantes en données de la part des utilisateurs de téléphones mobiles, les stations de base de la nouvelle génération possèdent une architecture à bandes passantes jusqu’à 60 MHz. Pour linéariser une bande de 60 MHz, la boucle de régulation de prédistorsion pour l’algorithme de linéarisation doit acquérir des produits d’intermodulation du 5e ordre jusqu’à 300 MHz. La numérisation de la distorsion d’intermodulation du 5e ordre nécessite une très large bande passante, un récepteur à faible niveau de bruit, avec une réponse exceptionnellement plate à 1,3 dB typique dans la bande passante. Ce circuit comprend un filtre passe-bas de 300 MHz qui présente une ondulation dans la bande passante inférieure à 1,3 dB. Comme la DPD est une boucle de retour, le récepteur, appelé également récepteur à estimation de canal de transmission de données, bénéficie de la faible attente. Une boucle plus rapide conduit à un meilleur fonctionnement de l’amplificateur de puissance et ainsi à une consommation plus faible. Le convertisseur A\/N présente une latence de cinq cycles d’horloge. Il fournit deux sorties DDR LVDS parallèles.
\nEncapsulé dans un boîtier BGA de 15 x 15 mm, ce composant économise de la surface de carte en utilisant un substrat multicouche. Ce dernier protège les lignes analogiques sensibles des pistes numériques afin de réduire le bouclage numérique. L’alimentation et le condensateur de traversée sont disposés à l’intérieur du µmodule et très proches de la puce, ce qui procure des avantages au niveau de la place, du coût et des performances par rapport à un boîtier traditionnel. <\/p>\n<\/p>\n

www.linear.com\/product\/LTM9013<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Couvrant des fr\u00e9quences d\u2019entr\u00e9e de 0,7 GHz \u00e0 4,7 GHz, le r\u00e9cepteur \u00b5Module RF num\u00e9rique LMT9013 de Linear Technology int\u00e8gre un double convertisseur analogique-num\u00e9rique 14 bits \u00e0 310 M\u00e9ch.\/s, un d\u00e9modulateur I\/Q \u00e0 IIP3 \u00e9lev\u00e9, deux amplificateurs \u00e0 gain variable et des filtres passe-bas de 300 MHz. Son architecture \u00e0 d\u00e9coupage en quadrature permet l\u2019acquisition d\u2019un signal de bande passante de 300 MHz avec un IMD3 de 66 dB sur toute la bande passante. Ce circuit vise les r\u00e9cepteurs de fr\u00e9quence interm\u00e9diaire FI basse, large bande, et les stations de base sans fil comprenant une lin\u00e9arisation par amplificateur de puissance avec une pr\u00e9distorsion num\u00e9rique (DPD). <\/p>\n","protected":false},"author":22,"featured_media":226867,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[881],"tags":[],"domains":[47],"ppma_author":[1149],"class_list":["post-226866","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nouveaux-produits","domains-electronique-eci"],"acf":[],"yoast_head":"R\u00e9cepteur RF \u00e0 \u00e9chantillonnage I\/Q \u00e0 pr\u00e9-distorsion num\u00e9r...<\/title>\n<meta name=\"description\" content=\"Couvrant des fr\u00e9quences d\u2019entr\u00e9e de 0,7 GHz \u00e0 4,7 GHz, le r\u00e9cepteur \u00b5Module RF num\u00e9rique LMT9013 de Linear Technology int\u00e8gre un double...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/226866\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9cepteur RF \u00e0 \u00e9chantillonnage I\/Q \u00e0 pr\u00e9-distorsion num\u00e9rique\" \/>\n<meta property=\"og:description\" content=\"Couvrant des fr\u00e9quences d\u2019entr\u00e9e de 0,7 GHz \u00e0 4,7 GHz, le r\u00e9cepteur \u00b5Module RF num\u00e9rique LMT9013 de Linear Technology int\u00e8gre un double convertisseur analogique-num\u00e9rique 14 bits \u00e0 310 M\u00e9ch.\/s, un d\u00e9modulateur I\/Q \u00e0 IIP3 \u00e9lev\u00e9, deux amplificateurs \u00e0 gain variable et des filtres passe-bas de 300 MHz. Son architecture \u00e0 d\u00e9coupage en quadrature permet l\u2019acquisition d\u2019un signal de bande passante de 300 MHz avec un IMD3 de 66 dB sur toute la bande passante. 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