Amplifiers with enhanced power supply rejection ratio at the output stage

摘要

An amplifier circuit is disclosed. The amplifier circuit includes a detection circuit, a control amplifier circuit and an output stage. The detection circuit detects disturbances occurring in a first supply voltage and provides detection results. The control amplifier circuit controls a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detection results. The output stage circuit includes a first output power transistor coupled to the control amplifier circuit at the first control node and a second output power transistor coupled to the control amplifier circuit at the second control node. The first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.

主权项

1. An amplifier circuit receiving a first supply voltage and a second supply voltage, comprising:
a detection circuit, detecting disturbances occurring in the first supply voltage and providing detection results to a control amplifier circuit; the control amplifier circuit, coupled to the detection circuit and controlling a first voltage provided to a first control node and a second voltage provided to a second control node in response to the detected results; and an output stage circuit, comprising: a first output power transistor, coupled to the control amplifier circuit at the first control node; and a second output power transistor, coupled to the control amplifier circuit at the second control node, wherein the first voltage and the second voltage are controlled differently when a disturbance is detected to have occurred.