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The differential trace impedance of HDMI is specified at 100Ω±15% in Test ID 8-8 in HDMI Compliance Test Specification Rev.1.2a and 1.3a. Rev. 1.3a has a more relaxed specification which allows an occurrence of a single excursion out to a max/min of 100Ω±25% and of a duration less than 250ps. General PCB knowledge (PCB Prepreg Selection, Critical Signal Trace Length and Microstrip Stub Effect) and impedance control on 4-layer PCB of 1080+2116 Prepreg will be discussed in this layout guideline.
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