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+//Example6_40  // Design an instrumentation amplifier
+clc;
+clear;
+close;
+//A = 5 to 500 ;  adjustable gain
+VR = 100*10^3 ;
+
+// the maximum differential gain of instrumentation amplifier is 500 
+//Amax = (R4/R3)*(1+(2R2/R1));
+//by solving above equation we get following equation
+// 2R2 -249R1f = 0                                                  equation 1
+
+// the minimum differential gain of instrumentation amplifier is 5
+// Amin = (R4/R3)*(1+(2R2/R1)) ;
+//by solving above equation we get following equation
+// 2R2 -1.5R1f = 150*10^3                                           equation 2
+
+//by solving equation 1 and 2 we get
+disp('The value of resistance R1f is = 0.0606 K ohm ');
+
+disp('The value of resistance R2 is = 75.5 K ohm ');
+