| US 7,557,743 B2 | ||
| D/A converter | ||
| Shigeo Imai, Yokohama (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Dec. 06, 2007, as Appl. No. 11/951,837. | ||
| Claims priority of application No. 2006-331767 (JP), filed on Dec. 08, 2006. | ||
| Prior Publication US 2008/0136694 A1, Jun. 12, 2008 | ||
| Int. Cl. H03M 1/66 (2006.01) | ||
| U.S. Cl. 341—144 [341/117; 341/118; 341/119; 341/120] | 18 Claims |
| 1. A D/A converter comprising:
a reference comparison current generator configured to generate a reference comparison current;
a first reference current generator configured to generate a first reference current capable of correcting a current level;
a first D/A converting part capable of outputting a first full-scale current having a predetermined proportional relationship
with the first reference current and capable of generating a first D/A converting voltage in accordance with first input digital
data; and
a current comparator configured to generate a difference current between the first full-scale current and the reference comparison
current to determine a magnitude of the difference current,
wherein the first reference current generator corrects the first reference current based on a result determined by the current
comparator; and
the reference comparison current generator has:
a second reference current generator configured to generate a second reference current; and
a second D/A converting part capable of outputting a second full-scale current having a predetermined proportional relationship
with the second reference current and capable of generating a second D/A converting voltage in accordance with second input
digital data, the second full-scale current corresponding to the reference comparison current.
|