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Amplifiers with enhanced power supply rejection ratio at the output stage

  • US 8,952,757 B2
  • Filed: 06/20/2013
  • Issued: 02/10/2015
  • Est. Priority Date: 07/11/2012
  • Status: Active Grant
First Claim
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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.

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