Port on the development of PC peripherals has played a revolutionary role in promoting, and is becoming increasingly popular, such as the acquisition of measurement data or the installation of software updates on the machine is very common in applications. As a bus system for data transmission, as long as there is a mobile device attached to the place where it is. Although the connector used in daily life seems very strong, but USB application developers still have to pay attention to the protection of these interfaces.
In the Intel company's "high speed USB platform design guide", and even improve the importance of considering the USB port susceptibility factors. Intel suggested that the current compensation type choke inhibits EMI, prevent electrostatic discharge and other components (ESD). Electronic devices are often subjected to electrostatic discharge. ESD pulse voltage can be as high as 30kV, so it is very dangerous for all types of integrated circuits. Some IC are "safe" for electrostatic discharge, but this security is a guarantee of a small part of the potential threat. Daily operation shows that extra protection is essential. Only by taking external protection measures can the whole circuit board be developed without the electrostatic discharge of the film and the high reliability of the products. Specific suppression measures are also required. Electronic equipment wireless networking is now the number of them is blossom everywhere, grow with each passing day.