Agilent 5991-4088EN English 2014-04-15 PDF 3.82 MB c20140925 [16] free download

File name 5991-4088EN English _ 2014-04-15 _ PDF 3.82 MB c20140925 [16].pdf

Keysight Technologies Evaluating Oscilloscope Signal Integrity Application Note Introduction The term "signal integrity" surfaces regularly in electronic test. Signal integrity is the primary measure of signal quality, and signal integrity importance increases with bandwidth, the need to view small signals, or the need to see small changes on larger signals. Why does oscilloscope signal integrity matter? Signal integrity impacts all scope measurements. The amount of impact signal integrity can make on signal shape and measurement values might surprise you. Oscilloscopes themselves are subject to the signal integrity challenges of distortion, noise, and loss. Scopes with superior signal integrity attributes provide a better representation of signals under test, while scopes with poor signal integrity attributes show a poorer representation of signals under test. This difference impacts engineers' ability to gain insight, understand, debug, and characterize designs. Results from oscilloscopes with poor signal integrity can increase risk in development cycles times, production quality, and components chosen. To minimize this risk, it is a good idea to evaluate and choose an oscilloscope that has high signal integrity attributes. 03 | Keysight | Evaluating Oscilloscope Signal Integrity - Application Note Infiniium DSO9404A (4 GHz) Infiniium DSOS404A (4 GHz) Eye height Eye height 1.55 V 1.75 V Figure 1(a). Even scopes from the same vendor rated at equal bandwidths can have varying signal integrity qualities. Here we show an eye diagram from the same source on two scopes each rated at 4 GHz. The scopes have identical bandwidth, vertical, and horizontal settings. The Infiniium S-Series show a more represen- tative eye shape and has an eye height measurement 200 mV higher than what the DSO9404A shows. The lower value and more representative shape is a result of superior signal integrity. Signal integrity is made of many attributes and this application note There are multiple scope attributes that work in conjunction with walks through each of them in detail. The principles here can be each other and hence the topic must be considered holistically. There applied to scopes in all bandwidth ranges. This application note are many banner specifications that are said to give you the `best'; articulates key signal integrity attributes and uses Keysight resolution, noise floor, jitter, etc. But you need to be mindful that Technologies, Inc. Infiniium S-Series