Hi,
I am using LMH0397RTVT IC in my design for both SDI input and output interface as equalizer and driver. I have attached the SI analysis results obtained for my board. I am observing poor return loss before the LMH0397 IC which is about -7db(100ohm impedance signal). The return loss and insertion loss observed after the driver IC is good(75ohm impedance). Is the return loss and insertion loss result obtained before the IC acceptable. Can the IC accept such lossy signal. Attached graph is for SDI in cable driver mode
2. Also I referred to the Fiigure.8 in datasheet. The SMPTE RL specification says the loss value to be in the range of -10db to -15db at 1.5GHz. Is this value applicable both for input and output of Driver IC( Both for 100ohm and 75ohm impedance signal). or applicable only for 75ohm differential signals.SI_analysis_for SDI.pdf
