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Wideband operational amplifier having a plurality of feedback loops

  • US 6,052,027 A
  • Filed: 04/06/1998
  • Issued: 04/18/2000
  • Est. Priority Date: 04/07/1997
  • Status: Expired due to Term
First Claim
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1. An amplifier comprising:

  • an input coupled to an input stage;

    an output coupled to an output stage;

    an output error correction stage coupled to an output of said input stage;

    an output of the output error correction stage being coupled to an input of said output stage;

    said output error correction stage including a first high open loop gain amplifier including a transistor comprising an active amplifying component;

    a first negative feedback path coupled to an output of the output stage and an input of said first high open loop gain amplifier;

    a second negative feedback path coupled between the output and input of said first high open loop gain amplifier;

    said second negative feedback path including at least one capacitor;

    said second negative feedback path forming a first local dominant pole;

    an output of said input stage being coupled to an input of said high open loop gain amplifier; and

    a power supply having an input coupled to said output stage and an output coupled to said active amplifying component;

    wherebythe power supply output voltage substantially follows the output voltage of said output stage.

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