Patent ID: 6525602
Filing Date: 2003-02-25
Classification: H03F

Abstract:
An amplifier stage for a buffer with negative feedback, the amplifier stage including an input stage and an output stage coupled to the input stage, the input stage comprising an input terminal, an output terminal, a first and a second supply terminal, a biasing branch, a first and a second balancing branch each comprising an active transistor in an amplification configuration for supplying, at the output terminal, a current depending on a current difference in the first and second balancing branches, the biasing branch and the first and second balancing branches being connected in parallel between the first and second supply terminals, wherein the input terminal divides the biasing branch into first and second input branches each comprising a constant-current generator, the active transistor being connected to a corresponding one of the constant-current generators and receiving a corresponding control voltage correlated with a voltage at the terminals of the corresponding constant-current generator.