Apparatus and method for producing an analog output signal...

H - Electricity – 03 – M

Patent

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H03M 1/68 (2006.01)

Patent

CA 2140536

A digital-to-analog converter (DAC, 300) utilizes a coarse DAC (306) and fine DAC (315) to produce an analog output signal having both low glitch energy and good linearity performance. The DAC (300) also uses an error table (312) to store correction data generated through a calibration procedure. Outputs (307, 311) from each DAC (306, 315) are summed to produce an analog output signal which exhibits better linearity than does the output (307) of the coarse DAC (306) alone.

L'invention concerne un convertisseur numérique/analogique (CNA, 300) utilisant un CNA à réglage grossier (306) ainsi qu'un CNA à réglage fin (315), afin de produire un signal de sortie analogique ayant à la fois une faible pointe de conversion et une bonne performance de linéarité. Le CNA (300) utilise également une table d'erreurs (312) pour mettre en mémoire des données de correction générées grâce un processus d'étalonnage. Les valeurs de sortie (307, 315) de chaque CAN (306, 315) sont additionnées pour produire un signal de sortie analogique présentant une linéarité meilleure que ce qu'on obtient avec le signal de sortie (307) du seul CAN (306) à réglage grossier.

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