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

An audio amplifier comprising:

• a voltage feedback amplifier stage having an audio signal input;
• a push-pull voltage gain/phase splitter stage driven from said voltage feedback amplifier stage;
• a bias adjustment stage driven from said push-pull voltage gain/phase splitter stage;
• a current drive stage driven from said bias adjustment stage;
• an output stage driven from said current drive stage, said output stage comprising a plurality of paralleled current-shared output-node driver circuits each including an operational amplifier having a non-inverting input coupled to said current drive stage, said operational amplifier driving a MOS output transistor coupled to an output node and providing negative feedback to an inverting input of said operational amplifier;
• an output load having a first terminal connected to said output node and a second terminal connected to a fixed voltage potential;
• a first voltage feedback loop comprising a voltage feedback stage having an input connected to a voltage divider driven from said first terminal of said load and an output connected to a feedback input node in said voltage feedback amplifier stage;
• a second voltage feedback loop comprising a voltage feedback stage having an input connected to said output node and an output connected to a feedback input node in said push-pull voltage gain/phase splitter stage;
• and
• a third feedback loop comprising a current feedback stage having an input in series between said output node and said load and an output connected to a feedback input node in said voltage feedback amplifier stage.