Method and apparatus for calibrating a gain control circuit

Details Method and apparatus for calibrating a gain control circuit Method and apparatus for calibrating a gain control circuit

H - Electricity

03

G

H03G 1/04 (2006.01) H03M 1/10 (2006.01) H03M 3/02 (2006.01) H03M 1/66 (2006.01)

Patent

CA 2167060

A system includes a digital-to-analog converter circuit and a calibration circuit The digital-to-analog converter circuit includes a gain control circuit providing volume adjustment. The system includes a calibration mode and a normal mode of operation. During calibration, a correction value associated with the gain control circuit is measured by the calibration circuit and stored. During normal operation, the stored correction value is combined with the input before provision of the same to the DAC circuit such that, for a predetermined input of midscale code, the desired system output remains constant despite any change in the volume setting of the gain control circuit.

Système comportant un convertisseur N/A et un circuit de calibrage et dont le convertisseur N/A comprend un circuit de contrôle de gain agissant sur le volume. Ledit système peut fonctionner soit en mode calibrage, soit en mode normal. Pendant le calibrage, un paramètre de correction associé au circuit de contrôle de gain est mesuré par le circuit de calibrage puis enregistré. Pendant le fonctionnement normal, les paramètres de correction sont combinés avec les valeurs entrées avant d'être transférés au convertisseur N/A, de façon à ce qu'en présence d'une entrée prédéterminée du code de mi-échelle, la sortie voulue reste constante indépendamment de toute variation du réglage du volume dans le circuit de contrôle de gain.

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