Lex
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In some noncritical environment it does not matter, I agree. But suppose you would use this amplifier in a bandgap circuit, where common mode is of importance. Then your whole point is false. Generalizing is fine by me, but at least specify this. Or suppose that this amplifier is the critical point for power consumption in a chip since you might have 100's of them in a chip. Then, any arbitrary gain (lets say 10%) you get from connecting the sourcebulks together is welcome. Note, this is not a technique where you simulate for hours to get an optimal point which is never going to happen IRL. This is a principal way to make it better, and that is the difference. Naturally, as with any design choice, there are tradeoffs.
Anyhow, I have no doubt that you know all of this, but a freshman might not.
PS. I agree that the word 'destroy' was a bit exaggerated, but hey, a good spark was needed for the discussion, right? =)
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