A method to optimize usb link impedance

Abstract

The invention relates to a method for optimizing USB link impedance. The method for optimizing the USB link impedance comprises a main board and a USB cable, wherein a signal emitting end and a connector are installed on the main board, and a USB signal transmission link is formed beteewn the signal emitting end, the connector and the USB cable in sequence. The USB signal transmission link impedance optimization method is realized by the following steps that S1, the USB signal transmission link from the signal emitting end of the main board to the connector is divided into a BGA area and a normal routing area according to the layout distribution of the main board, wherein the USB link impedance in the normal routing area and in the BGA area are the same; and S2, the USB link impedance of the USB signal transmission link between the connector of the main board and the USB cable is set the same as in the BGA area or the normal routing area. Contrary to common impedance optimization measures adopted in the prior art, the method for optimizing the USB link impedance ensures the unity of the overall link impedance by increasing the USB link impedance in normal area routing area and obtains better effects.

Description

technical field [0001] The invention relates to the improvement of the signal transmission line of the motherboard, in particular to a method for optimizing the impedance of the USB link. Background technique [0002] The full name of USB (Universal Serial Bus) is Universal Serial Bus, which is used to standardize the connection and communication between the host computer and external devices. USB is an interface technology used in the field of PC and electronic communication. It supports plug-and-play and hot-swappable functions of devices. Because of its strong data transmission signal and wide application range, it is widely used in various electronic devices. [0003] The USB device system is divided into two parts, the USB Host end and the USB Device end. Taking the U disk with the USB interface as an example, the U disk itself is a USB Device, and the USB interface of the PC and related control circuits are the USB Host part. Each part is composed of a hardware part a...

AI Technical Summary

Problems solved by technology

[0007] Although this measure can reduce impedance discontinuity to a certain extent and ensure local impedance continuity, since the entire USB link will have Cable, front control board and other parts in addition to the motherboard, the impedance of these parts and the motherboard wiring Impedances are not necessarily the same, which leads to the phenomenon that the local impedance of the USB link is consistent but the overall impedance is still discontinuous, which will also affect the quality of signal transmission

In this regard, most of the prior art optimizes the USB link by reducing the link impedance, but this leads to insufficient overall impedance optimization of the USB link, which is also a problem that needs to be solved urgently in this field.

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