Patent ID: 8344821
Filing Date: 2013-01-01
Classification: H05K

Abstract:
1. A printed circuit board layout method comprising: providing a printed circuit board comprising a signal layer and a pair of differential transmission lines positioned on the signal layer; determining a first distance; wherein when a distance between the pair of differential transmission lines is greater than the first distance, an eye width and an eye height of an eye diagram obtained at output terminals of the pair of differential transmission lines are substantially constant values; when the distance between the pair of differential transmission lines is less than the first distance, the eye width and the eye height of the eye diagram obtained at the output terminals of the pair of differential transmission lines are decreased from the constant values; determining a predetermined value, on the eye diagram obtained from transmit signals on the pair of differential transmission lines, when a percentage of a Far End Crosstalk (FEXT%) is approximately zero; setting a second distance shorter than the first distance, as the distance between the pair of differential transmission lines when the eye width and the eye height obtained at the output terminals are decreased from the constant values; and repeating setting the second distance until the eye width and the eye height are greater than the predetermined value.