Patent ID: 7944252

Claim:
An apparatus comprising: a first supply rail having a voltage between about 1.8V and about 3.3V; a second supply rail; an input stage coupled between that first and second supply rails that receives a differential input signal, wherein the input stage includes at least one differential input pair of complementary metal oxide semiconductor (CMOS) transistors; and a first output stage that is coupled to the input stage and to at least one of the first and second supply rails, wherein the first output stage includes a plurality of diode-connected transistors; a second output stage that is coupled between the first and second supply rails and to the first output stage, wherein the second output stage includes a first plurality of transistors; a third output stage that is coupled between the first and second supply rails and to the first and second output stages, wherein the third output stage includes a second plurality of transistors; and a pair of differential output terminals that are coupled to each of the second and third stages, wherein the pair of differential output terminals carry a differential current, and wherein the differential current travels in a first direction and is supplied through the second output stage when the differential input signal is in a first state, and wherein the differential current travels in a second direction and is supplied through the third output stage when the differential input signal is in a second state.