Patent ID: 6064268
Filing Date: 2000-05-16
Classification: H03F

Abstract:
An amplifier, comprising:an emitter follower transistor of a first conductivity type and having an input terminal, and first and second bias terminals;a load transistor having a load output terminal, a supply terminal, and a control terminal;a first constant current means, said first constant current means drawing a first fixed current from said second bias terminal and said load output terminal;a sense transistor having a first sense terminal, a second sense terminal, and a sense output terminal;a second constant current means, said second constant current means forcing a second fixed current through said sense transistor from said first sense terminal to said second sense terminal and into said first bias terminal, and wherein a difference in current between said first fixed current and said second fixed current causes said control terminal to control said load transistor to supply said difference in current to said first constant current means, anda current mirror, said current mirror providing a duplicate current, said duplicate current being a duplicate of a sense current that flows into said sense output terminal, and wherein said duplicate current is provided to said input terminal.