Protecting signal integrity is probably the largest difficulties in PCB layout, In particular with high-speed signals. Inside of a 6-layer PCB, signal integrity is often preserved by: With the rigid specifications for higher precision in PCB fabrication procedure, line width and spacing have beneath 0.1mm. Gold-plating board is less complicated https://rafaelipstw.blogsidea.com/37267813/a-review-of-rogers-high-frequency-board-pcb