This ensures that all USB-certified devices, whether PC or peripheral, will function correctly when interconnected, from the standpoints of both software and hardware. Device designs can receive USB certification-and use the USB symbol on a product, but only after passing very strict software and hardware tests. The USB Implementers Forum, Inc., an industry-standard-generating body sponsored by leading companies from the computer and electronics industry, lays down the standards for USB. The device is plugged into the PC, recognized by the PC then, after the first installation of appropriate software, the device will always be recognized by the host PC-a user-friendly handshake. USB’s main attraction is the ability to plug and play. Connectivity to mobile phones, MP3 players, and game consoles is another recent development. Devices that previously used serial ports and parallel ports are migrating to USB, while designers of devices such as hard drives and digital cameras are often choosing USB over other standards, such as FireWire or serial-port communication. Keyboards, printers, data-storage devices, and mobile phones are among the many peripherals that can be connected to a PC, employing the USB standard. USB has become the most popular standard for PC-to-peripheral communication in the world. What Is USB and Why Has It Become So Popular?

Additionally, we suggest how to maximize the opening in eye diagrams by careful board layout. We also show how key parameters of the switches affect the overall system design and discuss basic design challenges, such as the trade-offs between meeting bandwidth requirements and minimizing signal reflections. In this article, we describe the USB, then go on to explore the crucial role of switches in improving performance in applications such as portable media players, cell phones, and wireless pen drives. By selecting suitable switches, designers can significantly shorten design cycles by enhancing existing designs rather than developing new ones. The universal serial bus (USB) has become a dominant interface to fulfill the ever increasing needs for rapid data transfer between end devices-for example, downloading and uploading data between PCs and portable devices such as cell phones, digital cameras, and personal media players.ĬMOS switches can be used for connecting and routing data lines in USB systems.

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