Down/up-conversion apparatus and method

Details Down/up-conversion apparatus and method Down/up-conversion apparatus and method

H - Electricity

03

D

H03D 7/16 (2006.01) H04L 27/06 (2006.01) H03D 1/24 (2006.01)

Patent

CA 2305134

A down-converter converts an amplitude modulated high frequency signal into a low frequency or baseband signal. A first mixer (30, 32) mixes the high frequency signal into a composite signal having an in- phase component and a quadrature component. A complex bandpass filter (34) bandwith limits the composite signal into a bandwidth limited signal with an in-phase component and a quadrature component. A second mixer (36, 38) mixes the bandwidth limited signal into an intermediate signal with an in-phase component and a quadrature component, and an adder (40) adds one component of the intermediate signal to the other. A similar up-conventer performs the reverse process.

Un changeur abaisseur de fréquence convertit un signal haute fréquence modulé en amplitude en un signal basse fréquence ou bande de base. Un premier mélangeur (30, 32) mélange le signal haute fréquence pour obtenir un signal composite ayant une composante en phase et une composante en quadrature. Un filtre passe-bande (34) complexe limite la largeur de bande du signal composite pour obtenir un signal à largeur de bande limitée ayant une composante en phase et une composante en quadrature. Un deuxième mélangeur (36, 38) mélange le signal à largeur de bande limitée pour obtenir un signal intermédiaire ayant une composante en phase et une composante en quadrature. Enfin, un additionneur (40) additionne les deux composantes du signal intermédiaire. Un changeur élévateur de fréquence similaire réalise le processus inverse.

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