Multi-mode modulator and transmitter

Details Multi-mode modulator and transmitter Multi-mode modulator and transmitter

H - Electricity

03

D

H03D 7/16 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2512107

The present invention relates generally to communications, and more specifically to a method and apparatus of modulating baseband and RF (radio frequency) signals. A modulator topology is disclosed in which an input signal x(t) is up-converted to an output signal y(t), either by mixing it with two mixing signals .phi.1 and .phi.2 ("pseudo-direct conversion" mode), or by mixing it with only one mixing signal .phi.2 ("direct-conversion" mode). In pseudo-direct modulation mode, the .phi.1 and .phi.2 mixing signals emulate a local oscillator signal; the product .phi.1* .phi.2 has significant power at the frequency of a local oscillator signal being emulated, but neither .phi.1 nor .phi.2 have significant power at the frequency of the input signal x(t), the LO signal being emulated, or the output signal .phi.1 .phi.2 x(t).

La présente invention se relie généralement aux communications, et plus spécifiquement à un procédé et à un appareil de bande de base de modulation et de signaux de RF (fréquences radio). On met en oeuvre une topologie de modulateur dans laquelle un signal d'entrée x(t) est converti à la fréquence asendante en signal de sortie y(t), soit par mélange à deux signaux de mélange F1 et F2 (mode "pseudo-conversion directe"), soit par mélange avec seulement un signal de mélange F2 (mode de "conversion directe"). Dans le mode de modulation de pseudo-conversion directe, les signaux de mélange F1 et F2 émulent un signal local d'oscillateur; le produit F1 * F2 a la puissance à la fréquence d'un signal local d'oscillateur émulé, mais ni F1 ni F2 n'ont la puissance importante à la fréquence du signal d'entrée x(t), le signal LO, ou le signal de sortie F1 F2 x(t) étant émulés.

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