You must be congratulated for your persuance of M.Tech in Electronics and it is equally heartening that you want to acquire a Ph.D degree in your related branch. Here two things are important the first one is the Institution from where you want to have perusal of the same and then you need an efficient and a helpful guide to achieve your doctorate - degree. In fact, you would be assigned a topic and your Research - work would proceed in the direction as suggested by your guide. You need to go several books written by noted authors having sufficient teaching experience and at the same time, they do have huge experience in Research - work and apart from it you need to refer to different published journals in order to extract useful materials. Here there is a crucial role of the guide to assist you in your current project and hence the role of Guide in achieving a Ph.D degree is crucial.
IEEE is a recognised institution approved by HRD and is known as Indian Institute of Electronics Engineer and a degree obtained from this Institute is treated as equivalent to B.Sc ( Engg).
You can select a premier Institution like IIT for the perusal of Ph.D or otherwise look out for the Regional Engineering Colleges from where the Doctorate degree can be done. You may get the details from the Registrar of IIT of different locations such as Mumbai, Kanpur, Delhi etc. After having obtained a Ph.D from a noted Institute, your prospects for teaching profession in a government college multiplies and there would be faster growth of promotion.