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diff --git a/1583/CH9/EX9.9/PLLA_Ex_9_9.sce b/1583/CH9/EX9.9/PLLA_Ex_9_9.sce
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+clc
+//Chapter 9:Phase locked loop Analysis 
+//Example 9.9 page no 380
+disp('since the phase margin without time delay is 50 degree, a 10 degree phase lag can be introduced by the time delay at the crossover frequecy.That is ,')
+Wc=1000//crossover frequency
+thetaT=-0.174
+T=thetaT/Wc//time delay
+mprintf('The time delay is %3.2e ',T)
diff --git a/1583/CH9/EX9.9/Result_of_Chapter_9_Ex9_9.jpg b/1583/CH9/EX9.9/Result_of_Chapter_9_Ex9_9.jpg
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