Improved rc filter pole for fm transmitters

Details Improved rc filter pole for fm transmitters Improved rc filter pole for fm transmitters

H - Electricity

04

L

H04L 27/04 (2006.01)

Patent

CA 2574786

An RC filter pole (R1, C1) for FM transmitters converts an internal 2-pole Bessel-type filter (R1, C1, C2) on a chipset (BH141XS/F) by adding an external filter function to create a 3-pole composite filter with improved roll-off characteristics. The design methodology and specific low cost circuit implementation of the composite filter effectively minimizes the impact of signal degradation on overall link performance.

Selon l'invention, un pôle de filtre RC (R1, C1) pour émetteurs FM convertit un filtre de type Bessel bipolaire interne (R1, C1, C2) sur un jeu de puces (BH141XS/F) par addition d'une fonction de filtre externe afin de créer un filtre composite tripolaire présentant des caractéristiques d'affaiblissement améliorées. La technique de conception et la mise en oeuvre d'un circuit à faible coût spécifique du filtre composite permet de réduire au minimum l'impact d'une dégradation du signal sur la qualité globale de la liaison.

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