[SI-LIST] Re: New appnote on PDS design -- XAPP623

Ross,

Good point -- I will add this.  We used an in-line attenuator when 
making our measurements.  We did not use a DC block.  

-mark



pwelling@xxxxxxxxxxxxxx wrote:

>Mark,
>
>You might make a note in the Noise Spectrum Measurement section to use a DC
>Block to save the Spectrum Analyzer front end attenuators and other devices.
>Someone might measure higher voltages and damage their analyzer.
>
>Ross
>
>-----Original Message-----
>From: Ibrahim Khan [mailto:ikhan@xxxxxxxxxxxxxxxxxxx]
>Sent: Sunday, August 11, 2002 7:29 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: New appnote on PDS design -- XAPP623
>
>
>
>Mark,
>I have not completely read the app note yet but whatever I have read
>answers most of my questions on the subject.  Good work.  Question I
>have raised to the si-list if SSO applies to the differential signals as
>well because I have noticed that in the Virtex-II data sheet, under the
>"maximum number of simultaneously switching outputs per power/ground
>pair", they have listed all the single-ended I/O standard.  I am using
>LVDS on Virtex-II but it is not listed in the table.  Any reason for
>this?
>
>Regards
>Ibrahim
>
>-----Original Message-----
>From: Mark Alexander [mailto:mark.alexander@xxxxxxxxxx]=20
>Sent: Thursday, August 08, 2002 6:00 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] New appnote on PDS design -- XAPP623
>
>
>
>Hi Everyone,
>
>I've recently posted a new appnote on our site about decoupling for=20
>large FPGAs.  This group is pretty varied and has a lot of collective=20
>knowledge, so I'd be grateful for any feedback you might have on it.=20
> You can download it from:
>
>http://www.xilinx.com/xapp/xapp623.pdf
>
>(it's not linked in to SI Central yet)
>
>Thanks,
>mark
>
>
>
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