better isolation solution?

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What are you trying to accomplish with "isolation"? Do you want to break a common ground connection between a sender and receiver?
 
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voltage follower circuit is mainly employed to prevent loading of circuit.When we go for transmission lines(RF frequency) optocouplers are used ,sometimes isolators/circulators are also used.So you need to be specific about your requirement & accordingly use the method.
 

so for analog circuit involving voltage input, i could employ voltage follower circuit as a mean to isolate/buffer from the sender?

what is a circulator?

sorry, i trying to kill two birds with one stone and created some confusion.

sometimes i need "isolation to prevent sender from damaging my port", "buffer to reinforce the sender signals" and "buffer to prevent loading of sender circuitry"
 
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snooze said:
what exactly are their differences? which is better? Tks
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As other posters have mentioned, isolation removes the galvanic connection between two differerent circuits. Optocouplers, signal transformers and capcitive couplers are the most common circuits.

Buffering, on the other hand, you still maintain a common circuit connection, usually called "ground" or "common", but you add an intermediate, more sturdy stage to prevent loading and add protection.

From what I can gather from your posts, you need buffering.
 
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