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Posts Tagged ‘USB’

USB used as an Analog-RF Port

Tuesday, January 26th, 2016

Most associate USB and it’s hardware as a digital and system data transfer protocol only.  Thinking of USB in terms of Analog and RF has only recently been a subject of interest in USB design, a necessity with the advent of USB 3 speeds and protocols.   In fact, RF effects become dominant in the data transfer speeds involved with in USB 3.    CurrentRF has developed a methodologies and technologies that allow server and network device USB ports, normally thought as digital and system data transfer ports, to be used as Analog/RF pickup ports for system noise and power reduction.

If one opens and ignores the data lines used for any flavor of USB, and focuses only on the resident +5V power and ground lines, one will see a rich source of RF frequencies of significant magnitude, that would enable energy harvesting techniques to be employed to recover this resident, generated energy.  In fact, if one utilizes an ac coupled spectrum analyzer of sufficient bandwidth, one will not only see frequency spikes and noise related to USB data transfers, but “coupled in” frequencies and noise energies related to other aspects of servers and network devices.

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Developing USB 3.1 IP? Essential Updates To USB 3.0 You Need To Know

Tuesday, November 4th, 2014

Introduction

USB-3-1-vs-USB-3-Technical-ComparisonInitially, USB provided two speeds (12 Mbps and 1.5 Mbps). With rapid adoption and success of the USB standard and the increasing power of PCs and computing devices, the USB 2.0 specification was defined in the year 2000. USB 2.0 provided upto 480 Mbps of bandwidth while keeping software compatibility with earlier USB applications. With ever increasing bandwidth requirements, in 2008 the USB 3.0 specification (providing 5 Gbps bi-directional bandwidth) was released. USB 3.1 is the next logical step in this progression. It provides 10Gbps of bi-directional bandwidth while maintaining backward compatibility with previous USB versions. To know more about USB 3.1 Verification solution click here.

In this post, we will analyze the technical differences between the USB 3.1 and USB 3.0 specifications. The aim is to enable people familiar with USB 3.0 to quickly understand the main aspects of USB 3.1.

 We will analyze the PHY, Link and Protocol layers and list out the major ways in which USB 3.1 differs from USB 3.0.

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