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diff --git a/3866/CH6/EX6.6/Ex6_6.sce b/3866/CH6/EX6.6/Ex6_6.sce
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+clc; clear; close;
+
+//a
+Ctotal=10.8;//in fermifarad(from Ex 6_4)
+Reff1=12.5;// in kiloohm
+Reff2=30;//in kiloohm
+r1=1/2;
+r2=1/4;
+PHL=Reff1*r1*Ctotal;
+disp(PHL,'Tphl(in picoseconds)=');//answer vary due to roundoff error
+PLH=Reff2*r2*Ctotal;
+disp(PLH,'Tplh(in picoseconds)=');
+Tp=(PHL+PLH)/2;
+disp(Tp,'total inverter delay(in picoseconds)=');//answer vary due to roundoff error
+
+//b
+Cload1=2.4+1.2;//in fermifarad
+PHL1=Reff1*r1*Cload1;
+disp(PHL1,'FO1 fall delay(in picoseconds)= ');
+
+PLH1=Reff2*r2*Cload1;
+disp(PLH1,'FO1 rise delay(in picoseconds)= ');
+Tp1=2*(PHL1+PLH1);
+disp(Tp1,'total delay(in picoseconds)=');