[SI-LIST] Re: upper to How high the frequency to scan is sufficient for target impedance of Power distribution system

For those who do not have access to Howard's book, a similar explanation
of the relationship between bandwidth and risetime is given in one of=20
our application notes, AN-7A, "Low-Pass Risetime Filters for Time Domain
Applications."  The explanation is in the first section on time domain
and Gaussian signals. =20

It may be viewed electronically at the following
URL http://www.picosecond.com/support/app_notes.shtml where it may also
be downloading.

Kipp Schoen
Picosecond Pulse Labs

-----Original Message-----
From: Tom Dagostino [mailto:tom@xxxxxxxxxxxxx]
Sent: Thursday, April 29, 2004 11:54 AM
To: kos@xxxxxxxxxxx; meng.yubao@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: upper to How high the frequency to scan is
sufficient for target impedance of Power distribution system


The equation is BW =3D 0.35/risetime.  See Howard Johnson and Martin =
Graham's
"High Speed Digital Design, A Handbook of Black Magic" Appendix B for
details.


Tom Dagostino
Teraspeed Consulting Group LLC
Device Modeling Division
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@xxxxxxxxxxxxx <mailto:tom@xxxxxxxxxxxxx>


Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
http://www.teraspeed.com <http://www.teraspeed.com>

Teraspeed (SM) is the service mark of Teraspeed Consulting Group LLC


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Kong Chuan Susanto
Sent: Thursday, April 29, 2004 9:58 AM
To: meng.yubao@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: uper to How high the frequency to scan is
sufficient for target impedance of Power distribution system


Hi Meng,

I have read some papers that use 'risetime/0.35' for the upper bound
frequency. However I'm not sure where this thing comes from. Perhaps
others can comment on this too. The lower bound basically is from DC.

Regards,

Chuan

> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of
> meng.yubao@xxxxxxxxxx
> Sent: Monday, April 26, 2004 2:52 AM
> To: si-list@xxxxxxxxxxxxx; si-list-bounce@xxxxxxxxxxxxx
> Subject: [SI-LIST] uper to How high the frequency to scan is
> sufficient for target impedance of Power distribution system
>
>
> HI:
>    For a highspeed digital system PCB, we should control its
> PDS Impedance
> not to exceed its target Impedance from low frequency uper to high
> frequency, but how higher the upper frequency is good enough, and how
> lower the frequency ? Deducing from the Pulse width of the PCB
> simultaneous switch noise or from the signal rise/fall edge
> and its pulse
> width ? Can anyone give me some clear equation!
> regards
> meng yubao
>
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