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diff --git a/3515/CH5/EX5.22/Ex_5_22.sce b/3515/CH5/EX5.22/Ex_5_22.sce
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+++ b/3515/CH5/EX5.22/Ex_5_22.sce
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+// Exa 5.22
+format('v',7);
+clc;
+clear;
+close;
+// Given data
+S= -20;// sensitivity of closed to open loop gain in dB
+// sensitivity of closed to open loop gain = 1/(1+AB) = S
+// or (1+AB) = -S
+AB= 10^(-S/20) - 1;
+disp(AB,"The loop gain AB for which the sensitivity of closed loop gain to open loop gain is -20 dB, is : ")
+
+// Part (b) when 
+S= 1/2;// sensitivity of closed to open loop gain in dB
+//S= 1/(1+AB)
+AB= 1/S-1;
+disp(AB,"The loop gain AB for which the sensitivity of closed loop gain to open loop gain is 1/2 ,is : ")
+