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Xtalk can happen between different layers ?Wats exact effect of Coupling Capacitor

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anandt886

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Hello, I have a question about coupling capacitance....

Will the capacitance be formed between any metal layers ?? For example can it be formed between similar metal layers M1-M1.

I understand it can be formed between different metal layers M1-M2, M2-M3 etc... Also can the capacitance formed between M1-M5 M2-M6 like that ?

Once it is formed between the metal layers how will the signal transition on one layer affect the signal on other layer ? I understand the concept of "victim" and "aggressor" nets, but was not able to vizualize the exact effect of coupling capacitance..

Help would be appreciated....
 

Adding capacitance to a net will increased the net delay, impact setup and hold time.
 

anandt886 said:
Hello, I have a question about coupling capacitance....

Will the capacitance be formed between any metal layers ?? For example can it be formed between similar metal layers M1-M1.

I understand it can be formed between different metal layers M1-M2, M2-M3 etc... Also can the capacitance formed between M1-M5 M2-M6 like that ?

Once it is formed between the metal layers how will the signal transition on one layer affect the signal on other layer ? I understand the concept of "victim" and "aggressor" nets, but was not able to vizualize the exact effect of coupling capacitance..

Help would be appreciated....
Click to expand...

As you are aware of aggressor and victim concepts, If a coupling cap is formed between two nets, this additional cap will also have to be charged or discharged. This affects the transition time and hence effect timing.
 
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