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That's a common idea but rare in practice!

Such an amplifier would have a terrible Common mode rejection ratio, which is actually pretty important if you want to run a balanced connection.

This is why transformers are often used as you can get really good CMRR numbers.

I'm not sure if I have ever seen such an amplifier or what it would be used for. I had a balanced Kepco lab amp years ago but even that employed a differential input.

But I see this idea a lot. It should be put to bed as such an amplifier is really just plain impractical.


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