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diff --git a/1223/CH11/EX11.15/Ex11_15.sce b/1223/CH11/EX11.15/Ex11_15.sce
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+clear;
+clc;
+//Example 11.15
+Kn=0.2;
+Idq=0.1;
+ro4=1000;//Kohm
+ro6=1000;//KOhm
+ro2=ro4;
+//lambda=y
+y=0.01;
+gm=2*sqrt(Kn*Idq);
+printf('\ntransconductance=%.3f mA/V\n',gm)
+ro=1/(y*Idq);
+printf('\noutput resistance=%.2f KOhm\n',ro)
+Ro=ro4+ro6*(1+gm*ro);
+Ro=Ro*0.001;//Mohm
+printf('\noutput resistance of the cascode active load=%.2fMohm\n',Ro)
+Ro=Ro*1000;//KOhm
+Ad=gm*ro2*Ro/(ro4+Ro);
+printf('\ndifferential mode voltage gain=%.2f\n',Ad)