[SI-LIST] Re: relation between signal rise time and scope rise time

  • From: Alfred Lee <alfred1520list@xxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 31 Jan 2011 21:20:06 -0800

Here's my take.

With HJ's rule, at near the limit, what you see is not what you get, but you 
could figured out what it was.

With Tek's rule, who is in the interest of selling scopes, at the limit, what 
you see is for all practical purposes  what you get.

-
Alfred

"prasad" <hariprasad.palli@xxxxxxxxx> wrote:

>hi All,
>i was going through one of the note from an oscilloscope vendor  saying
>
>*oscilloscope rise time < signal rise time/5.*   its available at link
>below
>http://www.tek.com/Measurement/scopes/selection/pdf/55W_13768_2_rise.pdf
>
>
>but when i looked at the howard Johnson's book for High speed Digital
>Design, where the BW of a signal is calculated  as FKnee=  .5/Tr, and
>then
>BW of scope is chosen as around 1.4 to 2 times of BW.
>
>am i missing anything while trying to interpret what the  above
>highlighted
>statment?  request your comments.
>
>
>Thanks for taking time to read this....
>
>
>
>Best Regards,
>Hari....
>
>
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