①The frequency of digital logic circuit reaches or exceeds 45MHZ~50MHZ, and the circuit working on this frequency has taken up a certain part of the whole electronic system (for example, 1/3), it is called "high-speed circuit".
②High speed circuit mainly depends on the relationship between signal rise and fall time and transmission line delay.
③High speed products should be paid more attention to the dielectric loss (Df) of the plate.
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