[SI-LIST] Re: HDMI Frequency Failing RE Test by 7dB!!!!
- From: Rohit MISHRA <rohit.mishra@xxxxxx>
- To: "ah.vinod@xxxxxxxxx" <ah.vinod@xxxxxxxxx>, SI-LIST <si-list@xxxxxxxxxxxxx>
- Date: Wed, 23 May 2012 22:59:04 +0800
Hello Vinod,
In HDMI 1080p pixel clock runs at 74.25 MHz but serial data rate is 742.5 MHz,
right ?
I would like to know if you have used common mode choke coil in your PCB and if
your answer is Yes then I believe culprit is your HDMI cable.
Have you checked the Quality of Cable ?
Best Rgds,
Rohit Mishra
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of vinod ah
Sent: Wednesday, May 23, 2012 7:28 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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