I’ve been working with some Silicon Images (Lattice Semi) 9777 multiplexer chips lately and would appreciate any insight list members might have. When used at any resolution below 4k, there seems to be a 10 dB emission “pedestal” that stands out of the baseline emission at several frequencies, 742 MHz in particular. The pedestal is 666 usec long and repeats at whatever frame rate is selected. At first, I thought it was correlated with the SPI bus activity, since the timing was identical, but further experiments show that not to be true.
My question is, is this inherent to HDMI, or to the 9777? As is probably obvious, I don’t have a whole lot of experience with HDMI video. Thanks all! Brent DeWitt, AB1LF Milford, MA --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
