PCB Layout in Altium Designer. I have designed 2,4,6 and 8 layer boards. I like to do my own layouts since I will have control of part placement and signal flow. A good PCB layout is just as important as the actual circuit design, less agency and noise issues. I haven't done a high speed digital design in many years. Most of my layouts are mixed analog, power and digital designs. I have libraries of many SMT, BGA and TH parts.