Multi-stage, fully-differential class-AB amplifier

A fully-differential amplifier comprising:

• one or more stages to amplify a differential pair of input signals to produce an amplified differential pair of signals;
• and
• a class-AB output stage to further amplify the amplified differential pair of signals to produce a differential pair of output signals, the class-AB output stage including a pair of differential outputs, the class-AB output stage including for respective ones of the pair of differential outputs:
• a pair of output transistors coupled to a respective one of the pair of differential outputs, and to respective ones of a first supply rail and a second supply rail;
• a folded mesh of transistors to bias the pair of output transistors in class-AB, and in which transistors of the folded mesh of transistors form a control amplifier to regulate control inputs of the pair of output transistors;
• and
• a feedback circuit to drive the control amplifier.