Segmented digital-to-analog converter wireline driver

An apparatus comprising:

• one or more A-type resistance segments, wherein each A-type resistance segment comprises one or more A-type switches, at least one A-type linear resistor coupled to the one or more A-type switches via a first terminal of the at least one A-type linear resistor, at least one A-type tunable header unit coupled to the one or more A-type switches via a first terminal of the at least one A-type tunable header unit and coupled to a first supply via a second terminal of the at least one A-type tunable header unit, and at least one A-type tunable footer unit coupled to the one or more A-type switches via a first terminal of the at least one A-type tunable footer unit and coupled to a second supply via a second terminal of the at least one A-type tunable footer unit, wherein the at least one A-type tunable footer unit and the at least one A-type tunable header unit provide a tuning range sufficient to match an impedance of each A-type resistance segment to a first given impedance;
• one or more B-type resistance segments, wherein each B-type resistance segment comprises one or more B-type switches, and at least one B-type linear resistor coupled to at least a proper subset of the one or more B-type switches via a first terminal of the at least one B-type linear resistor, at least one B-type tunable header unit coupled to the one or more B-type switches via a first terminal of the at least one B-type tunable header unit and coupled to the first supply via a second terminal of the at least one B-type tunable header unit, and at least one B-type tunable footer unit coupled to the one or more B-type switches via a first terminal of the at least one B-type tunable footer unit and coupled to the second supply via a second terminal of the at least one B-type tunable footer unit, wherein the at least one B-type tunable footer unit and the at least one B-type tunable header unit provide a tuning range sufficient to match an impedance of each B-type resistance segment to a second given impedance;
• wherein the one or more A-type resistance segments implement k most significant bits of an N-bit digital-to-analog converter of the apparatus and the one or more B-type resistance segments implement N-k least significant bits of the N-bit digital-to-analog converter, wherein a resistance value of the at least one A-type linear resistor and a resistance value of the at least one B-type linear resistor are unequal, and wherein second terminals of the at least one A-type linear resistor and the at least one B-type linear resistor are coupled together.