Patent ID: 7265625
Filing Date: 2007-09-04
Classification: H03F

Abstract:
1. An electronic system that operates with a bias signal, comprising: a drive transistor; a resistor coupled between a control terminal and a current terminal of said drive transistor; a bias transistor that has a control terminal coupled to said current terminal of said drive transistor; and a current mirror arranged to mirror a first current in a current terminal of said bias transistor into a second current that is directed through said resistor to said current terminal of said drive transistor; said control terminal of said bias transistor thereby arranged to provide said bias signal and other current terminals of said drive and bias transistors thereby arranged to receive a common potential; and further including: a current transistor arranged to provide a mirrored current in response to said current mirror; a first loop transistor; a second loop transistor inserted between said bias transistor and said current mirror with a control terminal of said first loop transistor coupled to said current terminal of said bias transistor; and a third loop transistor inserted to pass said mirrored current from said current transistor through said first loop transistor with control terminals of said second and third loop transistors coupled together.