Patent ID: 6529152
Filing Date: 2003-03-04
Classification: H03M

Abstract:
A digital-to-analog converter, comprising:a series resistor strip comprising a plurality of resistors connected together by respective junctions, each junction defining a resistor strip node; said resistor strip connected between a first reference and a second reference to produce a different analog voltage at each resistor strip node; an amplifier having an input selectively coupled to one said analog voltage; a plurality of switches coupling resistor strip nodes to said amplifier via at least one coupling capacitor; and an auto zeroing circuit for zeroing said amplifier to a node voltage other than said first reference and said second reference wherein said zeroing circuit is coupled to said amplifier for initially charging one plate of said coupling capacitor with a voltage of one said resistor strip node, and not said first or second reference, said zeroing circuit operating in a zeroing phase that occurs prior to a conversion phase in which a digital word is converted to a corresponding analog voltage.