1.只需要眼圖Pass的情況可以選擇預設值1000mV0.0dB或調降位準強度至800mV0.0dB。 2.需要EMI可以Pass的情況，可以將位準強度調降至800mV0.0dB或600mV0.0dB。 3.若是要眼圖及EMI同時要達到法規標準，將位準強度調降至800mV0.0dB即可。 HDMI (high-definition multimedia interface) is a digital interface to transfer image and sounds. It is a common output device for the development technology in recent years. However, EMI (Electromagnetic Interference) is an important issue in such high speed transmission and a lot of problems need to be resolved. Some techniques without extra cost for reducing EMI issues deteriorate eye diagram and some techniques increase the cost by placing numerous shielding on metal chassis. In this thesis, we will focus on the research for note book using Intel processer with HDMI output. It provides a few modification parameters to adjust the signal strength in the Basic Input/Output System (BIOS). It is found that, without increasing the cost and changing the layout, the eye diagram and EMI could be compromised by our proposed techniques for adjusting the level output of BIOS as the following:
1. To satisfy the criteria for eye diagram, the level strength can be set as the default value 1000mV0.0dB or reduce to 800mV0.0dB. 2. To satisfy the criteria for EMI, the level strength can be set as 800mV0.0dB or 600mV0.0dB. 3. To satisfy the criteria for both eye diagram and EMI, the level strength must be set as 800mV0.0dB.
Finally, compared to the conventional techniques, our proposed techniques can improve both eye diagram and EMI without increasing the cost and changing the layout.