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

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.