System and method for arranging differential signal wire

Abstract

The invention discloses a system for arranging a differential signal wire. The system runs on a computer which comprises a wire arranging tool. The system comprises an establishing module and an adjusting module, wherein the establishing module is used for establishing a differential wire pair between a signal transmitting end and a signal receiving end by using the wire arranging tool; a perpendicular line is drawn on the boundary between a non-parallel region and a parallel region of a differential wire pair lead-out region; two intersection points between the perpendicular line and the differential wire pair refer to points at the same position; a perpendicular line is drawn from a bent position on a wire of the differential wire pair lead-out region to a position passing through an element; intersection points between the perpendicular line and the differential wire pair refer points at the same position; and the adjusting module is used for adjusting the wire of a differential signal when the difference value of the wire distance between the pin of the signal transmitting end and one pair of points at the same position is not in a standard range. The invention further provides a method for arranging a differential signal wire. According to the invention, tight coupling of the differential signal wire can be realized.

Description

technical field [0001] The present invention relates to a wiring system and method, in particular to a differential signal routing system and method. Background technique [0002] In high-speed printed circuit board (printed circuit board, PCB) design, engineers have taken various measures to solve signal integrity problems, and using differential lines to transmit high-speed digital signals is one of them. Differential lines in a PCB are coupled striplines or coupled microstrip lines, usually routed in parallel with fixed line width and line spacing. In theory, it is required that the signal is transmitted in an odd-mode transmission mode, that is, the phase difference of the positive and negative signals is 180 degrees. When the differential signal propagates in the non-ideal loop, the differential signal transmitted by the differential signal line can be coupled to the greatest extent, eliminating the cluttered signal and reducing the damage of the non-ideal loop to the ...

AI Technical Summary

Problems solved by technology

However, in the PCB layout design, there are always many complicated factors, which lead to the fact that in the actual differential line layout design, only attention is paid to whether the total length of the two transmission lines that make up the differential line is equal, and the following reasons are ignored. Unequal length: 1. The wire length of the chip package part is inconsistent; 2. After the differential line exits the pin, in the lead-out area (breakout area) usually due to the dense wiring space and pins, there must be a section of non-parallel running of the differential line. 3. The differential line is in the parallel part, every time it is bent and bypasses passive parts, via holes, screw holes, etc., it will cause local unequal lengths

Images