Radio having a mems preselect filter

H - Electricity – 03 – H

Patent

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Details

H03H 9/46 (2006.01)

Patent

CA 2580006

The present invention provides systems and methods for pre-filter (28) in a VHF receiver using Micro-Electro-Mechanical Systems (MEMS) filters. The system includes an antenna (24), and first and second Micro-Electro-Mechanical Systems (MEMS) filters (28). The first MEMS filter filters a signal received by the antenna based on a first pre-defined bandwidth, and the second MEMS filter filters the signal filtered by the first MEMS filter based on a second bandwidth. The system also includes an analog to digital converter (32) that converts the signal filtered by the second MEMS filter into a digital signal, a down converter (34) that down converts the digital signal produced by the A to D converter, and a digital signal processor (40) that processes the down converted digital signal produced by the down converter. The first and second MEMS filters or the down converter are adjustable based on a received tuning signal.

L'invention concerne des systèmes et des procédés de pré-filtre (28) dans un récepteur utilisant des filtres de systèmes mécaniques microélectriques (MEMS). Le système comporte une antenne (24), et un premier et un second filtres (28) de systèmes mécaniques microélectriques (MEMS). Le premier filtre MEMS filtre un signal reçu par l'antenne sur la base d'une première largeur de bande prédéfinie, et le second filtre MEMS filtre le signal filtré par le premier filtre MEMS sur la base d'une seconde largeur de bande. Le système comporte également un convertisseur analogique-numérique (32) qui convertit le signal filtré par le second filtre MEMS en signal numérique, un convertisseur abaisseur (34) qui convertit le signal numérique produit par le convertisseur A-N, et un processeur de signaux numériques (40) qui traite le signal numérique abaissé produit par le convertisseur abaisseur. Les premier et second filtres MEMS ou le convertisseur abaisseur sont réglables sur la base d'un signal de syntonisation reçu.

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