Patent ID: 7978005

Claim:
A core circuit for a reference current generation circuit, comprising: an input node adapted to receive a first current; a first transistor in a first current path, having a gate and a drain coupled to each other and to a bias circuit for sourcing the first current through the input node; a second transistor in a second current path, having a gate coupled to the gate of the first transistor, a drain coupled to the bias circuit through a second node, and configured to source a second current controlled by the first current; a third transistor, having a gate coupled to the gate of the first and second transistors, a drain coupled to the drain of the second transistor and the bias circuit through the second node, and configured to source a third current controlled by the first current, the third transistor having a threshold voltage that is different relative to a threshold voltage of the second transistor; and a resistive component coupled to conduct the second current, a voltage thus resulting across the resistive component being substantially equal to a voltage differential between a gate-to-source voltage of the first transistor and a gate-to-source voltage of the second transistor.