Pulse modulator and pulse modulation method

H - Electricity – 03 – M

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Details

H03M 7/00 (2006.01) H03K 7/00 (2006.01) B81B 7/02 (2006.01)

Patent

CA 2524020

The proposed pulse modulator has a subtraction stage which produces a control error signal from the difference between the complex input signal and a feedback signal, as well as a signal conversion stage which converts the control error signal to a control signal. The control signal is multiplied by a complex mixing signal at the frequency .omega.0 in a first multiplication stage. At least one of the real part and imaginary part of the up-mixed control signal is or are then quantized by a quantization stage, in order to produce a real pulsed signal in this way. The pulsed signal is then used to produce the feedback signal for the subtraction stage, in a feedback unit. The pulse modulator according to the invention allows the range of reduced quantization noise to be shifted toward a desired operating frequency .omegaØ

Modulateur d'impulsions comportant un étage de soustraction qui produit un signal d'écart à partir de la différence entre le signal d'entrée complexe et un signal de rétroaction, ainsi qu'un étage de conversion de signaux qui convertit le signal d'écart en un signal de réglage. Dans un premier étage de multiplication, le signal de réglage est multiplié avec un signal de mélange complexe de fréquence omega0. La partie réelle et / ou la partie imaginaire du signal de réglage mélangé sont ensuite quantifiées dans un étage de quantification pour produire un signal d'impulsion à valeur réelle. Le signal de rétroaction pour l'étage de soustraction est alors produit dans une unité de rétroaction à partir du signal d'impulsion. Le modulateur d'impulsions selon la présente invention permet de décaler la plage de bruit de quantification réduit vers une fréquence de travail omega0 souhaitée.

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