Rotated-bit pulse width modulated digital-to-analog converter

H - Electricity – 03 – M

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Details

H03M 1/66 (2006.01) H03K 3/027 (2006.01) H03M 5/08 (2006.01)

Patent

CA 2227866

A pulse width modulated digital-to-analog converter having a digital-to-analog pulse generator for outputting width modulated pulses in accordance with a digital control value. The generator includes a clock (14) for generating a clocking signal, a counter (12) responsive to the clocking signal for generating repeating sequences of N-bit counts, each sequence representing a count interval, and a bit rotator (20) for receiving the sequences of N-bit counts and for rotating bit position of at least a most significant one of N- bits. A latch (24) holds the digital control value for comparison in the comparator (22) to each one of the rotated N-bit counts to output the width modulated pulses during the count interval.

Convertisseur numérique analogique modulé en largeur d'impulsion (Fig. 1) comprenant un générateur d'impulsions numérique-analogique qui produit des impulsions modulées en largeur en fonction d'une valeur de commande numérique. Le générateur comprend une horloge (14) qui génère un signal de synchronisation, un compteur (12) qui réagit au signal de synchronisation pour générer des séquences répétées de comptages de N-bit, chaque séquence représentant un intervalle de comptage et un rotateur (20) de bit qui reçoit les séquences de comptages de N-bit et qui fait tourner la position de bit d'au moins un bit parmi les plus significatifs des N-bits. Un verrou (24) retient la valeur de commande numérique pour qu'elle soit comparée, dans le comparateur (22), à chacun des comptages de N-bit ayant subi une rotation pour produire les impulsions modulées en largeur pendant l'intervalle de comptage.

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