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Example： Precharge Evaluation

(B) C2-MOS (Clocked CMOS) Logic Version 1：　　　　　　　　　　　Version 2： CK=1：Active；CK=0：Disable Mp , Mn Switching or isolating devices Suitable for FF construct

Clock Skew Nat all clock arrive at the same time Two Problem： -adds more overhead： Tcyc = Td + Tsetup + Tclk-q + Tskew -Get the wrong answer： Tskew < Tclk-q + Thold Low overhead =>Fast latches，low clock skew.

H-Tree(1)

Single clock Distribution - 21064 Thick metal layer for clock M3 - 2μ thick Large clock buffer (entire vertical height of the chip)