Patent ID: 10433422

Abstract:
Provided is a differential wiring method for a high-speed printed circuit board, including the following steps: setting a pre-set impedance required value Z2 of a non-ball grid array (BGA) region, determining the width w2 of the second differential wire and the distance d2 between the two second differential wires according to the pre-set impedance required value Z2; calculating the width w1 of the first differential wire and the distance d1 between the two first differential wires, according to the distance s1 between two adjacent rows of bonding pads in a BGA region bonding pad array and the minimum processable distance s2 between the bonding pad and the first differential wire, where w1 and d1 should satisfy 2w1+d1≤s1−2s2, while further calculating w1 and d1 according to a differential characteristic impedance formula; arranging the two first differential wires disposed oppositely to each other in the BGA region according to the determined d1, and arranging the two second differential wires disposed oppositely to each other in the non-BGA region according to the determined d2; connecting the first differential wire and the second differential wire corresponding thereto via a first connection wire; and connecting the first differential wire and the bonding pad corresponding thereto via a second connection wire.