Layers
Multiple layers help reduce the size and increase the speed of circuits
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Single layer
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Double layer
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4 layer
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6 layer (used in PC motherboards)
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10 layer
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12 layer
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Some layers can be used as GND?
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Trace width calculators
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It is difficult to calculate number of layers. Use your intuition. Sometimes it is even hard to calculate the smallest size of the PCB as it is dependent on several parameters - PCB stackup, Vias, number of componenets, placements etc.
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Details:
- Reliability: Impedance, Total Power Dissipation
- Size: Dimensions
- Quality Tests: Reliability features
- Budget