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diff --git a/135/CH11/EX11.22/EX22.sce b/135/CH11/EX11.22/EX22.sce
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+// Example 11.22: AF, RoF
+clc, clear
+gm=2e-3; // in mho
+rd=20e3; // in ohms
+RD=12e3; // in ohms
+RG=500e3; // in ohms
+Rs=50; // in ohms
+RF=5e3; // in ohms
+function[c]=parallel(a,b)
+    c=a*b/(a+b);
+endfunction
+Ro=parallel(RD,rd); // in ohms
+AV1=-gm*parallel(RD,parallel(rd,RG));
+AV2=AV1;
+AV3=-gm*parallel(RD,rd);
+AV=AV1*AV2*AV3;
+RG_dash=parallel(RG,RF); // in ohms
+Vi_Vs=RG_dash/(RG_dash+Rs); // Vi/Vs
+AoL=AV*Vi_Vs*RF/(RF+Ro); // Vo/Vs (Open loop)
+bta=1/RF; // Feedback factor
+RM=AoL*Rs; // in ohms
+T=-bta*RM; // Return ratio
+AF=AoL/(1+T);
+RoD=parallel(Ro,RF); // in ohms
+RoF=RoD/(1+T); // in ohms
+disp(AF,"AF =");
+disp(RoF,"RoF (Ω) =");
+\ No newline at end of file