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Main points of this exam are: System in a Package, Plastic Packaging, Packaging Technology, Technology, Appropriate, Electronic Products, Systems Integration, Circuit Board Technology, Appropriate, Large Electronic Systems
Typology: Exams
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(NFQ – Level 8)
Please answer any four questions. All questions carry equal marks.
Examiners: Dr. J. J. Barrett Prof. C. Burkley Mr. J. Ryan
Question 1. “Packaging” (a) Why has plastic packaging, long considered to be only suitable for “low reliability” applications, come to be the most widely used form of IC packaging even for many “high reliability” applications? (10 marks) (b) Describe the IC packaging technology used in one of the electronic products which you have studied and discuss why this technology is appropriate for the particular product. (15 marks)
Question 2. “Circuit boards”
(a) What is “System in a Package” (SIP) and what are the systems integration challenges which SIP presents? (10 marks) (b) Describe the circuit board technology used in one of the electronic products which you have studied and discuss why this technology is appropriate for the particular product. (15 marks)
Question 3. “Thermal”
(a) In the case of very large electronic systems, thermal design must be considered at every level from each individual component up to room/building level. Taking the example of telecom cabinets, discuss how an integrated system-wide approach to thermal design is essential for successful system development and operation. (10 marks) (b) Describe the cooling technology used in one of the electronic products which you have studied and discuss why this technology is appropriate for the particular product. (15 marks)
Question 4. “Reliability” (a) “Traditional reliability models do not work”. Why is this particularly true for modern electronic products and outline a practical alternative approach to reliability which can be used by today’s electronic product designers? (10 marks) (b) Taking one of the electronic products you have studied as an example, outline what has been done in this product to make it reliable in its intended application. (15 marks)
Question 5. “Electrical” (a) Designers of today’s high speed digital circuit boards must consider electrical design issues which were previously mainly of concern only to RF and microwave circuit designers. (i) Why is this? (^) (1 mark) (ii) List the four main electrical design issues that need to be considered. (4 marks) (iii) For any one of these issues, outline the main design strategies which are used to ensure that they do not cause signal integrity problems. (10 marks)
(b) What are IBIS models and why have they become an accepted industry-wide standard for use in circuit board level electrical simulations? ( marks)