Fan out and Effective fan out

[SherlockBenedict]

Is there any difference between fan out and effective fan out?

Is fan out = Cout (or) Cout / Cin?

thanks a lot.

 

[ansarmytheen]

Hai,
effective fanout=Cout/Cin

 

[kushan_s]

Lets say you want to find out the delay of a gate :
The delay of a gate consists of two components. One is the parasitic delay p (intrinsic delay of the gate and can be found out by considering the gate driving no load) and the other component is the stage effort f.
Hence the delay d = f + p

Again, the effort is divided into two components :
Logical Effort g (Fanout) - The ratio of input capacitance of a given gate to that of an inverter capable of delivering the same output current. This does not take the load into account.
Electrical Effort h (Effective Fanout) - The ratio of input capacitance of a load to that of a gate.

Hence f = g*h and d = (g*h) + p.