This is an audio power amplifier, similar to what is common in transistor radios and other portable audio equipment. This circuit however, has an ultra- low quiescent current of about 250uA, due to a unique bias circuit. I don’t even know of a chip that does that. This circuit also has much higher open-loop gain, due to the bootstrap effect that the circuit provides as a by-product of its operation.
Source: http://discovercircuits.com/Andy/Ultra.pdf (good site)
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