1 files changed, 20 insertions, 0 deletions
diff --git a/257/CH11/EX11.25/example_11_25.sce b/257/CH11/EX11.25/example_11_25.sce
new file mode 100644
index 000000000..532d5db46
--- /dev/null
+++ b/257/CH11/EX11.25/example_11_25.sce
@@ -0,0 +1,20 @@
+s=poly(0,'s'); 
+F=syslin('c',[1/((1+0.001*s)*(s*0.1+1)*(0.25*s+1))])                  //without k
+
+fmin=0.1;                                        //Min freq in Hz
+fmax=20;                                          //Max freq in Hz
+
+scf(1);clf;
+bode(F,fmin,fmax);                                //Plots frequency response of open-loop system in Bode diagram
+
+show_margins(F)                                //display gain and phase margin and associated crossover frequencies
+
+// TO FIND VALUE OF K
+
+// for PM=40degrees, the point on the magnitude plot without k is 8dB away from 0dB line.
+k2=10^(8/20)                                      // 20*log(k1)= 8 dB
+disp(k2,"for PM=40degrees k is ")
+F2=syslin('c',[(k2)/((1+0.001*s)*(s*0.1+1)*(0.25*s+1))])
+
+[GainMargin,freqGM]=g_margin(F2)
+disp(GainMargin,"GM=")
+\ No newline at end of file