Oversampling technique to reduce jitter

H - Electricity – 03 – M

Patent

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Details

H03M 7/30 (2006.01) H04L 7/033 (2006.01)

Patent

CA 2519308

To achieve improved jitter performance within prescribed bandwidth constraints, a receiver (140) samples a digital signal (11) upon each of n periodic sample clock pulses that occur during the interval t, where n is chosen such that log2(n+1) is an integer (x) greater than zero. At the each of each interval t, the receiver generates a x+1-bit sample value having a first bit indicating the value of the digital signal being sampled, and x remaining bits which collectively indicate a sample interval during which the digital signal changed states if such a change did occur When a change does occur, the receiver inverts the first bit of each sample value upon decoding to coincide with the change in the digital signal.

Selon cette invention, pour obtenir des effets de gigue réduits avec des contraintes données en matière de largeur de bande, un récepteur (140) échantillonne un signal numérique (11) à chaque n impulsion d'horloge d'échantillonnage périodique observée pendant l'intervalle t, n étant choisi de façon que log¿2?(n+1) désigne un nombre entier (x) supérieur à zéro. A la fin de chaque intervalle t, le récepteur génère une valeur d'échantillonnage de x+1 bits comprenant un premier bit indiquant la valeur du signal numérique en cours d'échantillonnage, et x bits restants qui indiquent collectivement un intervalle d'échantillonnage pendant lequel le signal numérique a changé d'état si un tel changement s'est effectivement produit. Lorsqu'un changement se produit, le récepteur inverse le premier bit de chaque valeur d'échantillonnage lors du décodage de façon qu'on obtienne une coïncidence avec le changement dans le signal numérique.

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