Actually when analyzing the operation of these topologies I don't see any problem with them.This circuit will work only if you have a floating input source. So, now instead of 3-terminal circuit, you have 4-terminal device.
Could you explain about low impedance connection? What is it?Now we have a 4-terminal device instead of the usual 3-terminal, input source cannot have any low impedance connection between Vin and Vout.
I don't remember but maybe those above are the first ones.Have you seen any single- supply circuit without common ground between Vin and Vout?
First, let's take a moment to savor the Buckeye's victory over Noter Doter...So what is the problem caused by no common ground? I see that there is no common ground in these topologies but don't understand why it is source of problems.
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