Wilder Technologies SATA 2.5 Test Adapter Instrukcja Użytkownika Pobierz pdf (Strona 63)

What is the system bandwidth needed to measure 42.5

(20-80% )psec or less DUT Rise time

 System bandwidth should be around (42.5/1.5 ) 28psec

 Scope bandwidth of 16 Ghz and 16 Ghz DSP enhanced probe has System

Rise time of about 23 psec. It can measure the DUT Rise time of 42.5 psec

with error of 1%. And can measure DUT Rise time of 37 psec with error of

7%.

 We can indicate Pass or fail confidently only when the System band. width is

close to 16 Ghz scope .

 Is it fact for all scope vender ??

– Spec says it should not be less than 42.5psec.

– Max Rise time is limited by Eye diagram slope.

– Both scope and Probe rise time cannot be less or equal to the DUT rise

time because it can measure the signal rise time accurately only if DUT

RT is slower than system rise time by 1.5 X times.

 How it is handled in HDMI 1.4b today???

– We recommend 8Ghz scope and 13 Ghz probe, then system rise time is

38 psec which is close 2X faster than 75 psec

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Wilder Technologies SATA 2.5 Test Adapter Instrukcja Użytkownika Strona 63