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diff --git a/506/CH16/EX16.4.b/Example16_4b.sce b/506/CH16/EX16.4.b/Example16_4b.sce
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+clear;
+clc;
+
+//Calculation of noise margin
+//Given Data
+Vbb = 1.15;//in V
+Vee=5.20;//in V
+Vbe5=0.7;//in V
+R=1.18;//in K
+r=300;//in ohm
+Vbecutin=0.5;//in V
+
+//If all inputs are low then we assume that Q1,Q2 and Q3 are cutoff and Q4 is conducting
+Ve=-Vbb-Vbe5;//Voltage at Common Emitter in V
+//Current I in 1.18K Resistor
+I = (Ve+Vee)/R;//in mA
+I1=I;
+//Output Voltage at Y
+vy = -(r*I/1000)-Vbe5;//I is in mA so 1000 is multiplied
+Vbe = vy-Ve;
+if(Vbe<Vbecutin)
+    v=0.7;//voltage across Q5 in V
+    rQ5 = 1.5;//in K
+    i = (Vee-v)/rQ5;
+    v = 0.75;//from the graph in V
+    Ve = -v-Vbe5;
+    Vbe4=-Vbb-Ve;
+end
+vo = -vy-v;
+
+//Calculation of noise margin
+vn = Vbecutin-Vbe4;
+disp('Positive noise spike which will cause the gate to malfunction');
+disp('V',vn,'vn=');
+
+//end
+\ No newline at end of file