[SI-LIST] Re: DDR3 clock failing radiation Tests
- From: Doug Smith <doug@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 08 Jan 2012 17:29:40 -0800
Hi Vinod,
How did you measure the voltage waveforms at the inductor? Was this the
energy storage inductor? If so, that can be a tricky measurement for
commercial probes to make accurately.
Doug
On 1/8/12 5:41 AM, steve weir wrote:
> No,
>
> Steve.
> On 1/7/2012 9:35 PM, vinod ah wrote:
>> Hi all,
>> After going through the all the answers provided, i went ahead suspecting
>> the power supply. I find that the 1.5V switching regulator which powers the
>> DDR3 controller and memories is sometimes operating in discontinuous mode
>> due to lesser current drawn by the controllers& memories (by seeing the
>> voltage waveforms at the inductor of the switching regulator). So this
>> discontinuous mode of operation is the reason for EMI issue i am facing?
>>
>> Regards
>> Vinod A H
>>
>> --
>> -------------------------------------------------------
>> ___ _ Doug Smith
>> \ / ) P.O. Box 1457
>> ========= Los Gatos, CA 95031-1457
>> _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
>> / /\ \ ] / /\ \ Mobile: 408-858-4528
>> | q-----( ) | o | Email: doug@xxxxxxxxxx
>> \ _ / ] \ _ / Website: http://www.dsmith.org
>> -------------------------------------------------------
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
