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Method and apparatus for Class AB audio amplifier output stage voltage protection

  • US 9,225,303 B1
  • Filed: 07/11/2014
  • Issued: 12/29/2015
  • Est. Priority Date: 07/11/2014
  • Status: Active Grant
First Claim
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1. An output circuit for an amplifier, comprising:

  • a first power node for coupling to a positive power supply;

    a second power node for coupling to a negative power supply,an output node;

    first and second PMOS transistors connected in series between the first power node and the output node;

    first and second NMOS transistors connected in series between the output node and the second power node;

    a first input terminal coupled to a gate of the first PMOS transistor;

    a second input terminal coupled to a gate of the first NMOS transistor;

    a voltage divider coupled between the output node and a ground node GND, the voltage divider including first and second resistors which are connected at a first node;

    a first source follower including a third PMOS transistor, the third PMOS transistor having a gate coupled to the first node and a source coupled to a gate of the second NMOS transistor; and

    a second source follower including a third NMOS transistor, the third NMOS transistor having a gate coupled to the first node and a source coupled to a gate of the second PMOS transistor.

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