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Apparatus and method for improving power supply rejection ratio

  • US 9,401,679 B1
  • Filed: 05/01/2015
  • Issued: 07/26/2016
  • Est. Priority Date: 05/01/2015
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a first output transistor of an amplifier, wherein the first output transistor is electrically coupled to an output node;

    an amplifier compensation circuit comprising a compensation capacitor and an isolating transistor, wherein;

    the compensation capacitor has a first end and a second end, wherein the first end is electrically coupled to the output node, wherein the second end is electrically coupled to a first node;

    a source and a drain of the isolating transistor are in a conductive path between the first node and a gate of the first output transistor; and

    a biasing transistor in series with the isolating transistor, wherein the biasing transistor is configured to bias the isolating transistor, wherein the biasing transistor is part of a current mirror load of a first stage of the amplifier;

    wherein the isolating transistor is biased by diverting a first current from the first stage of the amplifier and returning the first current to the first stage of the amplifier.

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