Diploma

Yes, it's a very good choice. Semiconductor industry is growing the fastest in India due to the Technology development in Intellectual Property from most of the companies from India provides services to MNCs. VLSI industry deployed with two measures domain as follows:
Front End Development:
In this field you have to cop up with programming Languages respective to Hardware Description Language HDL for Protocol Designing and complex Digital designs. E.g., ARM processors BUS protocols, USB versions, PCIes, Ethernet and Bluetooth.
Digital design Engineer:
Design Language most prominent one RTL Register Transfer Logic and Digital Electronics and Microprocessors in-depth Knowledge
Verification engineer:
Most of the RTL design cycles ends with only verification of design to make Bug free and reliable, time to the market. According to standard VLSI design process consume 70%s verification of digital design using EDA tools more numbers demanding verification engineer. For same knowledge of Universal Verification Method system Verilog must. Back End Development
Here I know basics flow what in contains as to back end domain most probably term came across:
Physical Design Engineer:
Works on digital design on CMOS level one must have sound knowledge of semiconductor theory and somewhat network theory required. Now will talk about scope is on peak but for freshmen they must have sound knowledge of respective subjects as we haven't gone through in Bachelor's except Digital electronics. So professional Training is must to get into VLSI (tier 23 colleges).

AMIE (Associate Member of the Institution of Engineers) is considered to be an equivalent to B.Tech or Bachelor of Technology but if you go for AMIE then you might face slight trouble while appearing for job interviews. The AMIE is not a degree course like B.Tech, instead it is just a certification course in which there are two sections and the minimum time to pass both the sections is 4 years, however, in industries AMIE is given a higher preference than B.Tech, but after doing AMIE you cannot apply for teaching field (lectureship in colleges and universities), but after B.Tech your teaching field is also open for you. If you only interested in industry then go for AMIE. If you want to keep your chances open in the teaching field open, then go for B.Tech. In my personal opinion, I would suggest that you to go for B.Tech rather than AMIE because after B.Tech you have much better chances of getting a good job with a decent package in campus placements itself, whereas as far as AMIE is concerned, that might not be the case. Regards.