Improved trim circuits and methodologies for data converters

H - Electricity – 03 – M

Patent

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H03M 1/10 (2006.01)

Patent

CA 2603922

An improved digital-to-analog converter comprises a reference node, switches providing an input digital signal, and an output stage including at least one resistive element. A resistance ladder, coupled to the switches, includes branches corresponding respectively to bit positions, in which selective operation of the switches in response to the input digital signal produces a corresponding analog output signal from the output stage. The ladder includes a first trim structure coupled to the most significant bit position (MSB) and a second trim structure in the output stage resistive element or elements. The first trim structure is configured to adjust the gain of the converter without affecting the relative bit weights of the bit positions, and wherein the resistance of the first and second trim structures are substantially of a prescribed ratio prior to any trimming.

Un convertisseur numérique-analogique amélioré comprend un noeud de référence, des commutateurs émettant un signal numérique d'entrée et un étage de sortie comprenant au moins un élément de résistance. Un Ladder de résistance, couplé aux commutateurs, comprend des ramifications correspondant respectivement à des positions binaires, dans lesquelles le fonctionnement sélectif des commutateurs en réponse au signal numérique d'entrée produit un signal de sortie analogique correspondant en provenance de l'étage de sortie. Le Ladder comprend une première structure d'ajustage couplée à la position du bit de poids fort (MSB) et une seconde structure d'ajustage dans l'élément ou les éléments de résistance de l'étage de sortie. La première structure d'ajustage est configurée pour régler le gain du convertisseur sans affecter les poids binaires relatifs des positions de bit et les résistances des première et seconde structures d'ajustage représentent sensiblement un rapport prédéfini avant tout ajustage.

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