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If you do this:. e.g. 2.5V. P. P. P. P. P. P. N. N. N. N. N. N. N. N. N. N. N. N. P. P. P. P. P. P. V C. V C. V C. V C. And this input is 5V. V C. 1.5V. V C. 1V. So what should you do? Putting bulks at GND prevents diodes from
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If you do this: e.g. 2.5V P P P P P P N N N N N N N N N N N N P P P P P P VC VC VC VC And this input is 5V VC 1.5V VC 1V So what should you do? Putting bulks at GND prevents diodes from turning on, but it also keeps your unity gain configuration from working. Then V- tracks Vout Vref Vref And this diode turns on!