urgent help needed

[retupmoc]

Can anyone tell me what purpose unity gain buffer amplifiers serve and why do you connect 2 low pass filters of same corner frequency by cascading them using one of these op amp buffers and not directly together. Also can you show me the diagram of this and where the feedbacks taken from. im totally confused. Any help would be much appreciated

[dlgoff]

Unity gain amplifers or voltage followers are used to buffer. i.e. they can be used to interconnect two parts of a circuit to keep the parts from interacting with each other.

They have a high input resistance and a low output resistance.

Regards