For Coimbatore campus, the cut off for ECE is as follows:

Closing Rank (Open category): 2747

Closing Rank (State category): 16407

As far as marks are concerned, there isn't a concrete data of marks vs rank because rank is relative and depends upon relative performance of candidates. That being said, if you are a state student, 135-150 marks should be good enough. If you are an Open category student, 170-180 marks will a good bet. Hope this helps.

Good luck.

Dear aspirant,

You should require 12000 rank to enter into ece branch of Amrita. Amrita gives all courses of almost all streams of Engineering. So all the best for you results and let's hope for the best. 

Hope you have a bright and promising career in near future.

 Thank you