[SI-LIST] Re: Ripple Injection
- From: "Webb Jeremy W" <Jeremy.Webb@xxxxxxxxxxx>
- To: <Ravinder.Ajmani@xxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 10 Sep 2004 14:06:51 -0700
Ravinder,
Do a search in the archives for "Injecting noise into a plane". The =
link is //www.freelists.org/archives/si-list/ .
I answered a question just like this about 3 years back. I had to =
design something similar, and it ended up working fairly well. Here's a =
snippet of my answer:
--- 16 Jul 2001 ---
I have actually done this. All you have to do is design a passive bias =
tee to the desired frequency that you want to introduce
into your 3.3V Power Plane, and that should be sufficient for the =
experiment.
Here is an example:
DC
|
C
C L
C
C |
AC ----||---------- AC + DC
F =3D 10kHz
L =3D 1000uH
C =3D 4.7uF
DC =3D +3.3V from Power Supply.
AC =3D 10kHz or whatever frequency you want to introduce into your =
system.
AC+DC =3D the noisy voltage that is used to supply your board with =
+3.3V.
---------------------
You could also use an active bias tee instead of a passive bias tee. I =
did an experiment using both at the same frequency, and they seemed to =
work about the same.
Hope this helps.
Sincerely,
Jeremy Webb
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx =
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of =
Ravinder.Ajmani@xxxxxxxxxxxxxx
Sent: Friday, September 10, 2004 1:55 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ripple Injection
Hi
I need to inject low frequency ripple (250 mV - 1000 mV, 100 Hz - 5 kHz)
on DC power supply (5V and 12V). Can any one suggest a vendor who makes
such equipment, or details to put one together. Currently I am using a
fixture designed years ago by someone in my company, but it really
distorts the waveform at lower frequencies.
I will appreciate any type of leads.
Thanks.
Regards, Ravinder
Server PCB Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
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