RE: [SI-LIST] : DSO Selection

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From: sam.kvk@amd.com
Date: Tue Feb 08 2000 - 19:56:15 PST


Hi Manix,

If your signal is fairly repetitive and you are not keen on capturing the
transition info such as ringing, then a low analog bandwidth scope may be
okay. To view the transition edges more closely, it is the real-time
sampling rate that is important rather than the analog bandwidth. You may be
aware that very high analog bandwidths can be achieved, even with low
real-time sampling rates, by repetitive sampling techniques such as Random
repetitive sampling or Sequential sampling.

Agilent's this website gives fairly good information on the Oscilloscope
selection techniques.
http://www.tm.agilent.com/tmo/techinfo/English/10StepIndex.html

Regards,
Sam KVK
AMD-Singapore

> -----Original Message-----
> From: Ron Miller [SMTP:rmiller@Brocade.COM]
> Sent: Monday, February 07, 2000 12:01 PM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : DSO Selection
>
> If the data rate is 500 mbs, the maximum frequency is 250 mhz.
>
> However, to get a good picture of the waveform, 3X or 5X or even 7X the
> max frequency is required(odd harmonic content). 5X 250 would yield
> 1.25 Ghz and should give reasonable results.
>
> Ron Miller
>
> manix@notes.shuttletech.co.in wrote:
>
> From: Manickavelu@SHUTTLE TECHNOLOGY on 02/07/2000 01:20 PM
>
> To: si-list@silab.eng.sun.com
> cc:
> Subject: DSO Selection
>
> Dear All,
>
> We are in the process of selecting a Digital Storage Oscilloscope.
> The
> signal rate we are interested in is from DC to 500MHz.
>
> The theory is to choose a DSO that has a bandwidth of 5 times the
> rate of
> signal and a sampling rate of 2.5 times the rate of signal.
>
> But in practical, we are able to measure a 100-MHz signal with a
> 200-MHz
> bandwaidth DSO.
>
> So, can we choose a twice BW, and Sampling rate DSO to measure a
> 500-MHz
> signal?
>
> Your suggestions and comments would be greatly helpful.
>
> Thanks,
> Manix Velu.
>
> Encl: Nil.
>
> -oOo-
>
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> --
> Ronald B. Miller _\\|//_ Signal Integrity Engineer
> (408)487-8017 (' 0-0 ') fax(408)487-8017
> ==========0000-(_)0000===========
> Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA
> 95131
> rmiller@brocade.com, rbmiller@sjm.infi.net
>

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