fully differential buffer?

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blue2lucy

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For a fully dif op amp, aka 2 inputs and 2 outputs, apparently we can't directly connect the inputs and outputs (with opposite palarity) together to form a buffer. Then what is the best way to impement a fully differential buffer? What I can think of is resistor feedback configuration with gain of 1 or switched-cap...
 

Thank you. That's also what I've done before. But that's not a good buffer - the input resistance actully lower than that of the single ended version (non-inverting).
 

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