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Ques.regarding setup fixing?

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fail1

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How changing the driver cell can help fix the setup?
Also, why should we change the driver strength of the cells which has cross talk effects to fix setup?
 

you get setup violation when the delay through the datapath is more than the clock path. Increasing drive strength reduces delay
 

Initially it helps but after a point, upsizing actually degrades the delay since the gate cap of the increased driver also gets counted in.
 

the cell with a higher strength propagates the signal faster, cos of bigger size ( correct me if i am wrong)

so since in the setup chk, u always chk for the data to arrvive well b4 clk ... replacing the cell with a higher drive strength actually propagates the signal faster .... hence u can meet the setup time !!!

WBR
lakshman
 

In fact, driver signal speed depend on Voltage, R and C so adjusting them in order to fix delays.
 

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