Adjustable filter

H - Electricity – 03 – B

Patent

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Details

H03B 5/12 (2006.01) H03J 3/08 (2006.01) H03B 1/00 (2006.01)

Patent

CA 2379868

A radio transmitter and/or receiver comprising: an oscillator tuning circuit comprising an adjustable capacitor whose capacitance is adjustable my means of a first tuning signal; a filter tuning circuit comprising an adjustable capacitor whose capacitance is adjustable by means of a second tuning signal; an oscillator whose operational frequency is dependant on the reactance of the oscillator tuning circuit; a filter for filtering signals in the course of transmission and/or reception, and whose response is dependant on the reactance of the filter tuning circuit; and a tuning unit for generating the first and second tuning signals; wherein at least a part of the filter tuning circuit is a replica of at least a part of the oscillator tuning circuit and the tuning circuit is capable of generating one of the first and second tuning signals in dependence on the other of the tuning signals.

L'invention concerne un émetteur et/ou récepteur radio qui comprend : un circuit d'accord d'oscillateur comprenant un condensateur réglable dont la capacité est réglable au moyen d'un premier signal d'accord ; un circuit d'accord de filtre comprenant un condensateur réglable dont la capacité est réglable au moyen d'un second signal d'accord ; un oscillateur dont la fréquence de fonctionnement dépend de la réaction du circuit d'accord d'oscillateur ; un filtre permettant de filtrer les signaux en cours d'émission et/ou de réception, et dont la réponse dépend de la réaction du circuit d'accord de filtre ; et une bloc d'accord permettant d'émettre le premier et le second signaux d'accord. Au moins une partie du circuit d'accord de filtre est une réplique d'au moins une partie du circuit d'accord d'oscillateur, le circuit d'accord étant capable d'émettre l'un des deux signaux d'accord en fonction de l'autre signal d'accord.

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