Patent ID: 7057442
Filing Date: 2006-06-06
Classification: G05F

Abstract:
1. A current source comprising: a first transistor having a first terminal for receiving a first current, and a grounded second terminal; a second transistor having a first terminal for outputting a predetermined part of a second current, a second terminal grounded through a first resistor, and a control terminal coupled to a control terminal of the first transistor; a third transistor having a first terminal coupled to the first terminal of the second transistor, for outputting a residual part of the second current, a second terminal coupled to the control terminal of the second transistor, and a control terminal coupled to the first terminal of the first transistor; a second resistor coupled between the control terminals of the first and second transistors and the ground; and a current mirror having an input terminal coupled to the first terminal of the second transistor and an output terminal coupled to the first terminal of the first transistor, for mirroring the second current to the first current.