Hi
i have solved the 2 questions below but i'm not sure whether my answers are correct or not.
a. Explain the significance of the top and bottom layers of a PCB. What are they usually used for?
I think the significance is that it provides design flexibility. Signals can be separated and placed on the appropriate layer that helps improve the quality of the design. For example, if power is on top and ground is on bottom, the parasitic effect of the two adjacent layers can be used to help reduce noise.
b. Can you think of any rules or constraints to follow when routing it?
There are many correct answers to this question, but generally, it depends on the type of circuitry being routed, fabrication requirements, and manufacturing requirements.
Different circuitry types (analog, digital, RF, etc.) have different rules and constraints. An example constraint would be "signal A must not be closer than X to signal B", or "analog components must be placed on left side of board and digital on right", or "connector A must be located at left edge of board", etc.
Example design rules would be min or max trace widths, spacing between traces, pad sizes, hole sizes, and are closely related to board fabrication or manufacturing requirements.
Hope that helps...
eT