How to take the evil out of eye diagrams

摘要

Every Scientist, Engineer, and technician involved in any form of electronics has used an oscilloscope. Scope displays of amplitude as a function of time provide intuitive and easily interpreted pictures of signals. The high-speed communications industry is no exception to the widespread use of scopes. Workers researching, developing, and manufacturing components and communications-network equipment extensively use ultrawideband sequential-sampling oscilloscopes-commonly called DCAs (digital communications analyzers) or CSAs (communications signal analyzers)-to inspect eye-diagram waveforms and to quickly and easily ascertain signals' general health. Although producing an eye-diagram display is a straightforward procedure, several pitfalls can lead to inaccurate or erroneous measurements. You can easily recognize and solve some of these problems. Others are subtle and can be difficult to detect and correct.