Tree mixer with interstage filter

Details Tree mixer with interstage filter Tree mixer with interstage filter

H - Electricity

04

B

H04B 1/26 (2006.01)

Patent

CA 2244302

A conventional tree mixer has a gain stage formed of a differential pair of transistors and a mixing stage formed of two differential pairs of transistors. To prevent image noise from passing from the gain stage to the mixing stage or to prevent local oscillator frequencies from being coupled from the mixing stage to the gain stage due to parasitic capacitance an interstage filter is provided. In one configuration the filter is a notch filter tuned to block either the image frequency or the local oscillator frequency.

Les mixeurs arborescents courants comportent une étage de gain constitué d'une paire de transistors différentielle et d'un étage de mixage constitué de deux paires de transistors différentielles. Pour empêcher le bruit image de passer de l'étage de gain à l'étage de mixage ou pour empêcher la transmission à l'étage de gain des oscillations de l'oscillateur local de l'étage de mixage sous l'effet d'une capacité parasite, un filtre est monté entre ces étages. Dans l'une des configurations de l'invention, ce filtre est un filtre éliminateur de bande accordé de façon à bloquer la fréquence image ou la fréquence de l'oscillateur local.

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