Apparatus for performing frequency conversion in a...

H - Electricity – 04 – L

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H04L 27/00 (2006.01) H03D 3/00 (2006.01) H03K 5/00 (2006.01) H04B 1/26 (2006.01)

Patent

CA 2167702

An efficient apparatus for performing frequency conversion from a final IF frequency to a baseband frequency is described. A counter (401) generates two logical signals G1 (402) and G2 (403) which are passed to an exclusive-OR gate (404) and a multiplexer (406). When a control signal (411) is deasserted, multiplexer (406) passes signal G1 to I1 and signal G2 to I2; when control signal (411) is asserted, multiplexer (406) passes binary signal G1 to I2 (410) and signal G2 to I1 (407). Similarly, multiplexer (405) swaps its input real and imaginary samples when the output of exclusive-OR gate (404) is asserted; otherwise, it performs no operation on its input samples. Signals I1 (407) and I2 (410) are used to control arithmetic inverters (408) and (409) respectively. When the controlling signal for either inverter is asserted, the inverter performs arithmetic inversion, otherwise it performs no operation.

La présente invention concerne un convertisseur de fréquence permettant de convertir une fréquence intermédiaire finale en une fréquence de la bande de base. Un compteur (401) génère deux signaux logiques G1 (402) et G2 (403) qui sont envoyés à une porte OU exclusif (404) et un multiplexeur (406). Lorsque'un signal de commande (411) est démodulé, le multiplexeur (406) envoie le signal G1 à I1 et le signal G2 à I2. Lorsqu'un signal de commande (411) est modulé, le multiplexeur envoie le signal binaire G1 à I2 (410) et le signal G2 à I1 (407). De la même façon, en présence de la sortie de la porte OU exclusif est modulée, le multiplexeur (405) intervertit ses échantillons d'entrée réels et imaginaires; dans le cas contraire, il n'effectue aucune opération sur ses échantillons d'entrée. Les signaux I1 (407) et I2 (410) servent à commander les inverseurs arithmétiques respectifs (408, 409). Lorsque le signal de commande de l'un des deux inverseurs est modulé, l'inverseur concerné exécute l'inversion arithmétique; dans le cas contraire, il n'effectue aucune opération.

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