Patent ID: 7330143
Filing Date: 2008-02-12
Classification: H03M

Abstract:
1. A digital/analog converter comprising: a divided-voltage generating section that divides a reference supply voltage into a plurality of divided-voltages through a voltage distribution comprising a plurality of nodes; a decoder section that receives a digital signal so as to output a decoded selection signal; a first divided-voltage selecting section that selects a first set of nodes from the divided-voltage generating section and outputs a first set of divided voltages based upon the decoded selection signal; a second divided-voltage selecting section that selects and outputs a second set of divided-voltages from among the first set of divided-voltages on the basis of the decoded selection signal; a divided-voltage storing section that charges and discharges the second set of divided-voltages output from the second divided-voltage selecting section; a third divided-voltage selecting section that selects a predetermined voltage among the divided-voltages discharged from the divided-voltage storing section on the basis of the decoded selection signal; and a voltage output section that outputs the predetermined voltage selected from the third divided-voltage selecting section; wherein the first divided-voltage selecting section includes a plurality of switches connected to the plurality of nodes formed in the divided-voltage generating section; wherein the second divided-voltage selecting section includes a plurality of switches connected to the first set of selected nodes, and to nodes adjacent to the first set of selected nodes; and wherein a voltage associated with the first set of selected nodes is selected as a high voltage, and a voltage associated with the nodes adjacent to the first set of selected nodes is selected as a low voltage.