Patent ID: 8493150
Filing Date: 2013-07-23
Classification: H03F

Abstract:
1. An output stage for a class-AB amplifier, comprising: first and second supply terminals; an output terminal; first and second input terminals; a first transistor of a first channel type coupled between the first supply terminal and the output terminal, the first transistor having a gate coupled to the first input terminal; a first resistive dividing bridge having first and second resistances coupled to each other at a midpoint; second, third, and fourth transistors of a second channel type coupled in series between said output terminal and the second supply terminal and having respective gates, the gate of the second transistor being coupled to the second input terminal of the output stage, the gate of the third transistor being coupled to the midpoint of the first resistive dividing bridge which is coupled between said output terminal and the gate of the fourth transistor, and the gate of the fourth transistor being configured to be biased to a fixed voltage; first and second current sources; and a differential stage formed of two transistors in parallel, respectively of the first channel type and of the second channel type, the gate of the first transistor being coupled to a first node between the first current source and the differential stage and the gate of the second transistor being coupled to a second node between the second current source and the differential stage.