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diff --git a/506/CH16/EX16.4.a/Example16_4a.sce b/506/CH16/EX16.4.a/Example16_4a.sce
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+clear;
+clc;
+
+//Caption:Logic Level Output of an ECL gate
+//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;
+disp('mA',I,'Current in 300 ohm resistance I=');
+//Output Voltage at Y
+vy = -(r*I/1000)-Vbe5;//I is in mA so 1000 is multiplied
+Vbe = vy-Ve;
+disp('V',Vbe,'Vbe = ');
+if(Vbe<Vbecutin)
+    disp('Input transistors are non conducting as was assumed');
+    disp('If atleast one input is high then it is assumed that curent in 1.18K resistance is switched to R and Q4 is cutoff');
+    disp('Drop in 300 ohm resistance is zero.Since the base aand collector are tied together Q5 now behaves as a diode');
+    disp('Across Q5');
+    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
+    disp('mA',i,'i=');
+    disp('V',v,'v=');
+    Ve = -v-Vbe5;
+    Vbe4=-Vbb-Ve;
+    disp('V',Vbe4,'Vbe4=');
+end
+disp('The total output swing between two logic gates');
+vo = -vy-v;
+disp('V',vo,'vo=');
+
+
+//end
+\ No newline at end of file