[SI-LIST] Re: HDMI Frequency Failing RE Test by 7dB!!!!
- From: vinod ah <ah.vinod@xxxxxxxxx>
- To: "Traa, Boris" <boris.traa@xxxxxxxxxxx>
- Date: Wed, 23 May 2012 20:47:23 +0530
Hi Vijay,
We have option to control the current and voltage swing. We tried
both, without violating eye test, but still the i am seeing radiation
at 742.5MHz. The radiation level keeps chnaging as i try with multiple
cables. I found the best cable i had to be failing FCC limits by 7dB.
I used some HDMI cable which are sold by big brands, but i was failing
FCC by 12dB !!!.
Hi Boris,
We tested the Blu ray player and TV with same HDMI cable used for our
board testing. the Blu ray player used is from Sony while the TV is
from LG, we connected the blu ray player to TV using same HDMI cable
and took the readings.
Regards
Vinod A H
On Wed, May 23, 2012 at 8:43 PM, Traa, Boris <boris.traa@xxxxxxxxxxx> wrote:
> Dear Venod,
>
> You said that TV is oke and Blu Ray is tested. Seperately or as a combination
> with the same cables you also used to attach your board?
>
> Kind regards
> Boris Traa
> System design engineer EMC
>
> It's the currents that make circuits work or fail.
>
> Philips Innovation Services/EMC center
> Room 2.020
> High Tech Campus 26
> 5656AE Eindhoven, The Netherlands
> Tel: ++ 31 40 27 43766
> Fax: ++ 31 40 27 42224
> E-mail: boris.traa@xxxxxxxxxxx
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of vinod ah
> Sent: Wednesday 23 May 2012 3:58 PM
> To: SI-LIST
> Subject: [SI-LIST] HDMI Frequency Failing RE Test by 7dB!!!!
>
> Hi All,
>
> I am designing a board with HDMI input and HDMI output. I am facing EMI issue
> at 742.5MHz (failing FCC limits by 7dB) when running 1080p30 on both Input
> and output HDMI i.e. BLu ray player connected to HDMI input connector of my
> board is giving out data at 1080p30 and HDMI out of my board is connected to
> TV which is also 1080p30 content. So i am unable to find out how is 742.5MHz
> coming out as radiation as it is 10th Harmonic of pixel clock
> 74.25MHz!!!!!!!. I am not facing any issues with other harmonics except for
> this. So i am totally confused on how to go about debugging this issue.
>
> Note: All the signals are routed on top layer without vias and all signals
> have solid ground plane reference. The blu ray player and TV used, is tested
> for radiation and no significant levels seen.
>
> Regards
> Vinod A H
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