I am referring to the accepted answer in this question
The answer has 25 votes, and is picked as the best answer but after carefully reviewing it, I could only come to a conclusion that it is not accurate or that I am missing something.
A, What is the point of this so-called super-diode, where the last stage has already been off-set to vcc/2? (meaning the signal from last stage are all positive)
B, That is a just differential amplifier however, it seems to be stretching the signal. It seems to me that in first stage, he adds (off-set) vcc/2 to the signal, and the last stage, he subtracts vcc/2 from the signal.
I am wondering whether I am missing something. Otherwise, I am wondering what the correct answer to the original question is.