Patent ID: 6639536
Filing Date: 2003-10-28
Classification: H03M

Abstract:
A digital-analog converter of an n-bit resistance-division type that has a resistor row including a series connected 2n resistors, where n is an even number, the digital-analog converter comprising:a first switch group including 2n switches, each switch having two terminals, wherein one terminal of one switch is connected to the end terminal of the resistor row and one terminal of each of the remaining switches is connected to each node between two adjacent resistors in the resistor row; a second switch group including 2n switches, each switch having two terminals, wherein one terminal of one switch is connected to the end terminal of the resistor row and one terminal of each of the remaining switches is connected to each node between two adjacent resistors in the resistor row; a first node group, comprising 2n/2 nodes, formed by short-circuiting 2n/2 of the terminals of the switches in the first switch group that have not been connected to the resistor row; a second node group, comprising 2n/2 nodes, formed by short-circuiting 2n/2 of the terminals of the switches in the second switch group that have not been connected to the resistor row; a first output terminal; a second output terminal; a first output switch that connects the nodes in the first node group to the first output terminal; a second output switch that connects the nodes in the second node group to the second output terminal; and a switch controller that controls ON/OFF of the switches in the first switch group and the second switch group based on an input code such that all the switches are OFF or only one switch is ON.