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diff --git a/1583/CH9/EX9.4/PLLA_Ex_9_4.sce b/1583/CH9/EX9.4/PLLA_Ex_9_4.sce
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+clc
+close
+//chapter 9: Stability Analysis
+//Example 9.4 page no 363
+//given
+clear
+N=2
+Kv=0.83*10^3//DC gain
+B=1250//closed loop bandwidth
+wn=1.27*10^3
+wL=wn^2/Kv//corner frequency
+s=poly(0,'s')
+h=syslin('c',(1/((s^2/wn^2)+0.9*s/wn+1)))
+clf();bode(h,1,1000);
diff --git a/1583/CH9/EX9.4/Result_of_Chapter_9_Ex9_4.jpeg b/1583/CH9/EX9.4/Result_of_Chapter_9_Ex9_4.jpeg
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