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diff --git a/1850/CH4/EX4.6/exa_4_6.sce b/1850/CH4/EX4.6/exa_4_6.sce
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+// Exa 4.6
+clc;
+clear;
+close;
+// Given data
+V_PP= 3;// in volt
+del_t= 4;// in micro sec
+// del_V= 90% of V_PP - 10% of V_PP = 0.8*V_PP
+del_V= 0.8*V_PP;
+SR_required= del_V/del_t;// in V/micro sec
+disp("The required op-amp must have an SR equal or more than "+string(SR_required)+"  V/micro sec");
+
+// (i)
+disp("The 741 op-amp has an SR of 0.5 V/micro sec. It is too slow and cannot be used");
+
+// (ii)
+SR= 50;// in V/micro sec
+SR= SR*10^6;// in V/sec
+del_t= del_V/SR;// in sec
+del_t= del_t*10^9;// in ns
+disp(del_t,"The 318 op-amp has an SR of 50 V/micro sec. It is fast enough and can be used. The rese time using a 318 op-amp will be (in ns)")