I got the idea from a design very similar to this, one of the only differences being it used only MOSFETs and no BJTs. Due to its symmetry, a few problems with OP-Amps are fixed. One of these is the biasing issue. Instead of having to use custom valued components in order for the output to be properly biased, this amp achieves this simply because of the symmetry and every transistor having the same parameters.
