Patent ID: 8237596
Filing Date: 2012-08-07
Classification: H03M

Abstract:
1. A resistor string digital-to-analog converter apparatus comprising: a string of resistors disposed in an array of columns and rows between a first reference voltage node and a second reference voltage node, each resistor in the string having a resistor tap; a switch connected to each resistor tap, the switches in each row operable to connect the resistor taps in that row to one of a plurality of voltage lines; a converter operable to receive a first portion of input data and convert said first portion of input data to Gray code data; a first decoder operable to receive said Gray code data and generate a first control signal, said first control signal operable to activate the switches in a single column; a second decoder operable to receive a second portion of said input data and generate a second control signal; and a first multiplexer coupled to the plurality of voltage lines, and operable, in response to the second control signal, to select one of the plurality of voltage lines and output a first output voltage from the selected voltage line.