Teledyne-lecroy Eye Doctor II Instrukcja Użytkownika

Operator'sManualEye Doctor IISoftware

Eye Doctor II SoftwareSignal InputSignalInputTouch the Signal Input button on the Eye Doctor IIdialog to access the Signal Input dialog.Note: SDAIII

Operator's ManualEmphasisEmphasis OverviewEmphasis is added to a signal as a way to pre-compensate for expected channel losses. Since highfrequen

Eye Doctor II SoftwareEmphasis ImplementationEmphasis is implemented as a tapped delay line filter, with 2 taps for auto-add and 8-taps for auto-remov

Operator's ManualExamples of Auto Add Pre-emphasis (center) and De-emphasis (right)along with no emphasis (left).The analysis for each lane shows

Eye Doctor II SoftwareAuto Remove EmphasisAuto Remove Emphasis automatically determines the appropriate tap values for your input signal whenthe amoun

Operator's ManualLane1 (left)is configured with emphasis removal turned off, and is shown for reference. (The Emp trace isequal to SDAInput). No

Eye Doctor II SoftwareEmulate / De-embedEmulate / De-embed OverviewTouch the Emulate / De-embed button on the Eye Doctor IIdialog to access the Emula

Operator's ManualEmulate /De-embed Setup1. Choose a Configuration.2. Touch the De-Embed Fixture, Emulate Channel and/or De-embed Channel buttons

Eye Doctor II SoftwareDe-embed Channel / De-embed FixtureThe De-embed Channel / De-embed Fixture configuration allows to you both de-embed a fixture a

Operator's Manualoverall response to the lower frequencies where signal components are detectable above the noise. Ifthis value is set to zero (t

Eye Doctor II Software Operator's Manual© 2013 Teledyne LeCroy, Inc. All rights reserved.Unauthorized duplication of Teledyne LeCroy documentatio

Eye Doctor II Software6. View Response to plot the characteristics of the fixture or channel as it will appear after import.7. Touch Apply to build th

Operator's Manuall Lines beginning with ! are comment lines. Comments must be at the front of the file. No com-ments are allowed once the frequen

Eye Doctor II SoftwareTherefore, it is helpful to follow some simple rules to maximize the effectiveness of using a touchstonefile:l Take S-parameter

Operator's ManualEqualizerEqualizer OverviewEyeDoctor II includes Continuous Time Linear Equalizer (CTLE), FeedForward Equalizer (FFE) and Decis

Eye Doctor II SoftwareEqualizer SettingsThe Equalizer feature allows you to see the waveform after equalization. Since DecisionFeedbackEqualization r

Operator's Manualcan be used as inputs to SDAII to perform eye diagram and jitter analysis. These are not used whenusing equalization within SDA

Eye Doctor II SoftwareThis graph shows the response of the CTLE response for SuperSpeed USB. Eye Doctor IIuses these set-ting as the default for the

Operator's ManualFeedForward Equalization (FFE)A Feed Forward Equalizer (FFE) is implemented as a tapped delay line filter, with 1 tap per unit

Eye Doctor II SoftwareFFE Filter AlgorithmFeed-forward equalization is implemented as a tapped delay-line filter, with the 1 tap per unit interval.The

Operator's ManualIllustration of an FFEfilter with 4 taps, including 1 precursor tap922961 Rev A27

Operator's ManualTABLE OF CONTENTSEye Doctor IIOverview 3KeyFeatures 3Accessing Eye Doctor II 4Eye Doctor II Dialog 4Using Eye Doctor II with S

Eye Doctor II SoftwareClock RecoveryA recovered clock signal is required for Decision Feedback Equalization. For this reason, a clock recoverydialog i

Operator's ManualDecision Feedback Equalization (DFE)To use the DFE:1. Check the Enable checkbox in the Decision Forward Equalizer (DFE) section.

Eye Doctor II Softwarebits, which depends on its ability to accurately decode bits - a case of circular logic. Depending on thestrength of DFE applied

Operator's Manualappropriate Eye diagram. SDA IIhas a Find Frequency button on the Clock Recovery tab of its dialog, ifthe data signal is approp

Eye Doctor II SoftwareCase 1, without equalization.Equalize the eye by enabling DFE and training it:Case 1, with DFE equalization (at 100mV/div vertic

Operator's ManualIf this is not what you want to see, use SDA II's Deskew control on its Ref. Clock Input dialog, to move theeye horizontall

Eye Doctor II SoftwareCase 2A CLOSED EYE (6GB/S THROUGH 30” OF FR4)With no equalization applied, this signal clearly shows a closed eye. However, we c

Operator's ManualCase 2, with CTLE equalization which will be used for clock recoveryNow touch Clock Recovery and on the dialog shown, touch Find

Eye Doctor II SoftwareNote: DFE taps is set to 7, the default is 3. The result looks significantly better when using 7 taps, becauseon long runs of th

Operator's ManualCase 3A SEVERELY DEGRADED SIGNAL (10GB/S THROUGH 30” OF FR4)First, we'll look at the input waveform. It's clear that t

Eye Doctor II Software2922961 Rev A

Eye Doctor II SoftwareCase 3, with CTLE equalization.An interesting point about this waveform is we would expect higher CTLE boost to improve the eye,

Operator's ManualFinally the last step in the case 2 procedure is to Train the DFE processor. When we do this it clearly doesnot succeed - the re

Eye Doctor II SoftwareCase 3, with 6dB de-emphasis and 7 tap DFE.Let's see if more DFE taps help. Note the somewhat tighter distributions at the

Operator's ManualAs noted previously, this value should not be changed.The DFE taps are optimized together with this value; changing it changes t

Eye Doctor II SoftwareSave / RecallOpen the Save/Recall tab of the Eye Doctor IIdialog to save your current Eye Doctor II setup or recall apreviously

Operator's ManualEye Doctor IIOverviewEye Doctor II is a complete set of tools that allows the full-range of de-embedding, emulation and equal-i

Eye Doctor II SoftwareAccessing Eye Doctor IIFrom Within SDAIII-CompleteLinQUsers of SDAIII-CompleteLinQ will find Eye Doctor II capabilities on the

Operator's ManualUsing Eye Doctor II with SDAII and SDAIII-Com-pleteLinQBesides being a very powerful yet easy to use analysis tool for fixture d

Eye Doctor II SoftwareSelecting Eye Doctor II SignalsWhen accessing EyeDoctor IIvia the Analysis > Eye Doctor II path, signals appear in the Eye

Operator's ManualInput to SDAIIWhen using an Eye Doctor IIoutput signal as the source input for SDAII processes, choose Input1EDrOut. This is no