Hello Naveen,

Some of the good colleges in Tamil Nadu that provides b.tech in electronics communication engineering are as follows:-

• Indian Institute of Technology Madras - [IITM]
• National Institute of Technology - [NIT]
• Hindustan Institute of Technology and Science - [HITS]
• P.S.G College of Technology - [PSGCT]
• Vellore Institute of Technology - [VIT University]
• SASTRA University
• Tamil Nadu Agricultural University - [TNAU]-
• Amrita Vishwa Vidyapeetham Coimbatore Campus
• Coimbatore Institute of Technology - [CIT]
• SRM Engineering College
• Vinayaka Missions University - [VMU]
• Indian Maritime University - [IMU]
• Academy of Maritime Education and Training University - [AMET]
• VELS University
• St. Joseph's College of Engineering - [SJCOE]

Hope it helps you 

Thank you