Question

Which isolation technique is used in applications like military and aeroscope?

(a) Thin film isolation

(b) PN-junction isolation

(c) Barrier isolation

(d) Dielectric isolation

I have been asked this question during an interview.

My doubt is from Basic Planar Process in portion IC Fabrication of Linear Integrated Circuits

Answer 1

Accurate option is (d) Dielectric isolation

Simply put: In dielectric isolation a layer of solid dielectric is used for isolation purpose. This layer is thick enough such that its associated capacitance is negligible. Moreover, it is more expensive, which is justified by its superior performance.