Hi Vinod, The EMI issue could be due to excessive current being driven on HDMI o/p. I would suggest check on the current driver o/p and evaluate if there is scope to reduce the drive strength without disturbing your eye mask specifications. Hope this helps. Thanks Vijay --- On Wed, 5/23/12, Rohit MISHRA <rohit.mishra@xxxxxx> wrote: From: Rohit MISHRA <rohit.mishra@xxxxxx> Subject: [SI-LIST] Re: HDMI Frequency Failing RE Test by 7dB!!!! To: "ah.vinod@xxxxxxxxx" <ah.vinod@xxxxxxxxx>, "SI-LIST" <si-list@xxxxxxxxxxxxx> Date: Wednesday, May 23, 2012, 8:29 PM 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 ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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 ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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 ------------------------------------------------------------------ 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 forum is accessible at: http://tech.groups.yahoo.com/group/si-list 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