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Wide bandwidth, current sharing, MOSFET audio power amplifier with multiple feedback loops

  • US 6,646,508 B1
  • Filed: 05/03/2002
  • Issued: 11/11/2003
  • Est. Priority Date: 12/30/1996
  • Status: Expired due to Fees
First Claim
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1. A phase-splitter/level shifter comprising:

  • a single-ended input node;

    a feedback node coupled to ground through a shunt resistor;

    first and second complimentary output nodes;

    first and second complimentary power supply rails;

    a first load resistor coupled between said first power supply rail and said first output node;

    a second load resistor coupled between said second power supply rail and said second output node;

    a first MOS transistor having a drain coupled to said first output node, a source coupled to said feedback node through a source resistor and a gate;

    a second MOS transistor having a drain coupled to said second output node, a source coupled to said feedback node through a source resistor and a gate;

    first and second complimentary reference current sources;

    a first operational amplifier having a non-inverting input coupled to said single-ended input node, an inverting input coupled to said second reference current source, and an output coupled to said gate of said first MOS transistor;

    a second operational amplifier having a non-inverting input coupled to said single-ended input node, an inverting input coupled to said first reference current source, and an output coupled to said gate of said second MOS transistor; and

    a variable resistor coupled between said source of said first MOS transistor and said second MOS transistor.

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