Abstract: A method and apparatus for converting an N-bit digital word to an analog voltage signal. A first circuit converts the MSBs of the N-bit word and a second circuit converts the LSBs. The first circuit includes a resistor array in series between reference nodes and a switch matrix providing a node voltage to a first buffer input responsive to an indication of the MSBs of the N-bit word wherein the buffer output provides the analog voltage signal. The second circuit includes a current device electrically isolated from the resistors of the first circuit and coupled to a second buffer input which is further coupled in a feedback arrangement with the buffer output. The current device provides a select current whereby the resistance of the feedback loop and the select current are cooperably modify the analog voltage signal incrementally corresponding to the LSBs of the N-bit digital word.

Abstract: The present invention provides for a method and apparatus for converting an N-bit digital word to an analog voltage signal in which a first circuit (410) provides for conversion of the most significant bits of the N-bit digital word and a second circuit (430) provides for the conversion of the least significant bits. The first circuit (410) includes an array of resistors coupled in series between reference nodes and a switch matrix for providing a node voltage to a first input of a buffer (420) responsive to an indication of the most significant bits of the N-bit digital word in which the buffer output provides the analog voltage signal. The second circuit (430) includes a current device electrically isolated from the resistors of the first circuit (410) and coupled to a second input of the buffer (420) in which the second input is further coupled in a feedback arrangement with the buffer output.