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

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From: WEBB,JEREMY (A-Sonoma,ex1) (jeremy_webb@agilent.com)
Date: Wed Apr 18 2001 - 16:20:38 PDT


Farrokh,
 
Picosecond Pulse labs, http://www.picosecond.com/
<http://www.picosecond.com/> , makes several bias tees that will do the job.
It all depends on the
frequency of the noise you want to inject. They make bias tees that can
handle frequencies down to 3.5kHz and up to 20 GHz.
Hope this helps.
 
Sincerely,
 
Jeremy Webb
 
 
-----Original Message-----
From: Farrokh Mottahedin [mailto:farrokh@cisco.com]
Sent: Wednesday, April 18, 2001 4:57 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Re: Methods to introduce noise in power planes

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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