Rf filter arrangement with image trap

Details Rf filter arrangement with image trap Rf filter arrangement with image trap

H - Electricity

03

J

H03J 3/02 (2006.01) H03D 7/18 (2006.01) H03H 7/12 (2006.01) H03J 3/08 (2006.01) H04B 1/26 (2006.01) H04N 5/50 (2006.01)

Patent

CA 2190904

A tuner includes a tunable filter (907-2) for selecting a desired RF signal in response to a tuning control signal and a tunable image trap (907-3) for rejecting the undesired image signal corresponding to the desired RF signal responsive to the tuning control signal coupled in cascade between an RF amplifier (905) and a mixer (909). The tunable trap (907-3) also serves as an impedance transformation element between the tunable filter (907-2) and said mixer (909). The arrangement is particularly useful in a tuner in which the frequency range of the local oscillator signal is below the frequency range of the received RF signals.

n syntoniseur comporte un filtre accordable (907-2) utilisé pour sélectionner un signal RF en réponse à un signal de commande d'accord, ainsi qu'un piège à images accordable (907-3) servant à bloquer le signal image parasite correspondant au signal RF désiré produit par suite de la transmission, d'un amplificateur RF (905) à un mélangeur (909), du signal de commande d'accord. Le piège accordable (907-3) sert également d'élément de transformation d'impédance entre le filtre accordable (907-2) et ledit mélangeur (909). Ce montage est particulièrement utile dans un syntoniseur où la gamme de fréquences des signaux de l'oscillateur local est au-dessous de la gamme de fréquences des signaux RF reçus.

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