Patent ID: 8339161

Claim:
A voltage buffer, comprising: a first signal path extending from an input terminal to an output terminal, the first signal path including a buffer transistor, the buffer transistor having a control terminal, a first and second current terminals responsive to the control terminal, wherein the control terminal is coupled to the input terminal and the first current terminal is coupled to the output terminal, and wherein the first signal path supplies a load current to a load device responsive to an input signal at the input terminal; a second signal path extending from the input terminal to a current source node, the second signal path including a replica load device of the load device; a current source supplying substantially constant current and being coupled to the current source node; and a current buffer coupled between the current source node and the output node, wherein the current buffer directs a replica load current from the second signal path responsive to the input signal and the substantially constant current from the current source to the buffer transistor.