Patent ID: 7737734

Claim:
An adaptive output driver comprising: a plurality of transistors coupled in series between an external supply voltage and a ground voltage; and an adaptive bias input circuit comprising a first operational amplifier with a first constant voltage output and a second operational amplifier with a second constant voltage output, the adaptive bias input circuit being configured to generate a p-bias input signal corresponding to said first constant voltage output coupled to a first gate of a first of the plurality of transistors and an n-bias input signal corresponding to said second constant voltage output coupled to a second gate of a second of the plurality of transistors, wherein the p-bias input signal and the n-bias input signal corresponding to said first and second constant voltages, respectively, are each generated from a voltage input signal, wherein the p-bias input signal comprises a voltage equivalent to the difference between the external supply voltage and twice a p-threshold voltage drop, and wherein the n-bias input signal comprises a voltage equivalent to the difference between twice an n-threshold voltage drop and the ground.