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Re: what is cross talk ?.when will it is come?how to reduce
Crosstalk is the unintended signal distortion due to coupling capacitance between two neighbouring nets.
Due to decreasing process nodes to cope with the requirment of routing, additional metal layers are being used. The width of these additonal metal layers is decreasing rapidly and the height of these additonal metal layers is increasing. This leads to a situation where the signal transition in a net causes unintended signal distortion in the neighbouring nets on the same metal layer or different metal layers.
Ways to reduce the crosstalk:
Downsize the aggressor nets, upsize the victim nets, insert buffers in long nets, increased spacing between the aggressor and the victim, shielding the victim nets from the aggressor nets, routing metal layers at 90 degrees to each other, using low K dielectrics, use of repeaters in case of long nets etc..
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