Question

1. Describe how the new chips are sorted before they are attached to the printed circuit board. 2. Describe how the printed circuit board of an multi-chip unit is organized? 3. How multi-chip units are powered up? What is the role of pin fin in an multi-chip unit?

Answer 1

PCB is collection of IC In this to test and sort out IC

1) We will use probe card as a tester to test at wafer level itself

2)load board to test at packaged level.

B). in PCB chips can be aligned in any way there is no particular rule to say that they should be aligned in orthogonal way only . Latest technology allows PCB designers to rotate the chips also.chips organisation should be in this way sych that it should occupie less space and routing must be esye.

C)

To power up multichip unit you first determine how much it needed by multimeter because some times it gives fault Rating by manufacturer.When you are first poserinp the device use supply with current limit .

Pin fin is used to sink the heat