Patent ID: 6262627
Filing Date: 2001-07-17
Classification: H03F

Abstract:
A power amplifier, comprising a power operational amplifier adapted to receive an input signal on at least one input terminal and deliver a corresponding amplified signal on an output terminal and having at least one input stage and one power stage coupled in series in a chain between said at least one input terminal and said output terminal, that can be operated in a first mode, with both the input stage and the power stage enabled, and a second mode, with the input stage disabled and the power stage enabled, the power operational amplifier including a control element coupled to the input stage for selectively disabling and enabling the input stage, and the input stage including a differential amplifier having first and second input terminals coupled to the respective input terminals of the power operational amplifier, and including a gain stage having an input coupled to an output terminal of the differential amplifier and having an output coupled to the input of the power stage.