Circuit board layouts can be a nightmare. Automatic routing algorithms suck for networks of realistic sizes, so a lot of the work is done by hand and that is a

Circuit board layouts can be a nightmare. Automatic routing algorithms suck for networks of realistic sizes, so a lot of the work is done by hand and that is a mixture of tedium and art. If you are designing high power or high frequency circuits you also need to observe a lot of constraints in your layouts as well (distances between parts, potential cross talk between parallel traces, signal travelling time along the traces belonging to the same bus...).