Power integrity and signal integrity design choices only work if they keep noise within the CMOS noise margin.
One of the most important parameters describing digital systems operating at high speed is noise margin. In a general sense, noise margins define an acceptable level of noise that can be present on an I/O pin or in an interface. In terms of digital electronics, noise margin characterizes the level of noise that can appear on an I/O pin without creating an error in a received logic state. This is regularly invoked in the time domain and is used to measure bit error rates.
If you are designing a high-speed PCB and need to perform spot crosstalk checks, it’s quite important to know what specifically is being used as the metric for success. A good place to start is with CMOS noise margin values for your digital components as they will most likely be built with the CMOS process.
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