Fwd: Re: [SI-LIST] : Re: Methods to introduce noise in power planes

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From: Farrokh Mottahedin (farrokh@cisco.com)
Date: Thu Apr 19 2001 - 10:42:35 PDT


A follow up question please:

Ray Anderson wrote: "Feed the DC power to your system through the tee's RF
choke." The bias tees are capable of passing 500 ma at the most, my board
under test requires over 10 amps. How is raw DC power connected to the board?

Thanks,

Farrokh Mottahedin

>Date: Wed, 18 Apr 2001 16:11:57 -0700 (PDT)
>From: Ray Anderson <Raymond.Anderson@Sun.COM>
>Reply-To: Ray Anderson <Raymond.Anderson@Sun.COM>
>Subject: Re: [SI-LIST] : Re: Methods to introduce noise in power planes
>To: si0list@silab.eng.sun.com
>Cc: farrokh@cisco.com
>X-Mailer: dtmail 1.3.0 CDE Version 1.3 SunOS 5.7 sun4u sparc
>
>
>The one that we are using in our lab for noise injection
>experiments is labeled:
>
>Picosecond Pulse Labs
>Model 5575A
>
>
>
> >Dear Mr. Anderson,
> >
> >Would you be willing to share the vendor name and part number of the
> >broadband bias tee mentioned in your reply below.
> >
> >Thanks,
> >
> >Farrokh Mottahedin
> >
> > -----Original Message-----
> > > From: Ray Anderson [SMTP:Raymond.Anderson@Sun.COM]
> > > Sent: Monday, April 16, 2001 3:34 PM
> > > To: si-list@silab.eng.sun.com
> > > Subject: Re: [SI-LIST] : Methods to introduce noise in power planes
> > >
> > >
> > > Although there are several ways of doing this, one method which we
> > > use in our lab and have had really good results with is to utilize
> > > a commercial broadband bias tee to inject the noise.
> > >
> > > Feed the DC power to your system through the tee's RF choke. Inject
> > > your desired noise into the system via the capacitively coupled port.
> > >
> > > We've also tried building up ferrite transformers etc. to try to
> > > match the 'noise' to the ultra low impedance of the boards power
> > > distribution system but found the bias tee method works much better.
> > >
> > > Ray Anderson
> > > Sun Microsystems Inc.

==============================================
Farrokh Mottahedin, Cisco Systems, Inc.
Gigabit Systems Business Unit GSBU
(408) 525-9185
farrokh@cisco.com

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