Patent ID: 7423476
Filing Date: 2008-09-09
Classification: G05F

Abstract:
1. A circuit for providing an output current at an output, comprising: a reference current source configured to provide a reference current; a bias circuit coupled to the reference current source and configured to output a bias voltage according to the reference current; an output transistor having a control node coupled to the bias circuit and further having first and second nodes, the output transistor operable to conduct current from the first node to the second node in accordance with the bias voltage; and a clamp circuit coupled to the output transistor and configured to clamp a voltage across the first and second nodes of the output transistor, the clamp circuit having a bias current source configured to provide a bias current and a second bias circuit coupled to bias current source and further coupled to the second node, the second bias circuit configured to provide a clamp voltage to the second node in accordance with the bias current.