Radio frequency signal reception using frequency shifting by...

H - Electricity – 04 – B

Patent

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H04B 1/16 (2006.01)

Patent

CA 2201753

An RF communications receiver permits greater integration on standard silicon chips and consumes less power than previous receivers. Sub-sampling and discrete-time signal processing techniques are used to frequency down-convert, filter, amplify, and select a desired analog RF channel. A sample-and-hold circuit (81) sub-samples the desired analog RF channel of carrier frequency fc, thereby down-converting it to a discrete-time image signal of frequency fi. Successive down-sampling, (99. 1) anti-alias filtering, (95.1) and amplification of the discrete-time image signal yields a low-frequency discrete-time signal containing a down-converted channel of frequency fk. The low-frequency discrete-time signal is then digitized, (87) filtered, (91) and demodulated (93) to reveal its baseband information content.

Un récepteur de communications à haute fréquence (HF) permet une plus grande intégration sur des puces en silicium classiques et consomme moins d'énergie que les récepteurs antérieurs. On utilise des techniques de traitement de signaux tels que le sous-échantillonnage et le temps discret pour abaisser, filtrer, amplifier une fréquence et sélectionner un canal (HF) analogique voulu. Un circuit d'échantillonnage et de maintien (81) sous-échantillonne le canal (HF) analogique voulu de fréquence porteuse fc, abaissant ainsi la fréquence à un signal d'image à temps discret de fréquence fi. L'échantillonnage par abaissement (99.1), le filtrage anti-repliement (95.1) et l'amplification successifs du signal d'image à temps discret produit un signal à temps discret basse fréquence contenant un canal converti par abaissement de fréquence fk. Le signal à temps discret basse fréquence est ensuite numérisé (87), filtré (91) et démodulé (94) afin de faire apparaître son contenu d'informations de bande de base.

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