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+//Example6.3 // design an non-inverting amplifier with colsed loop gain of 5 limited voltage of -5 V <= Vo <= 5 V  and maximum i/p c/n 50 uA
+clc;
+clear;
+close;
+R1 = 8*10^3 ; // ohm
+R2 = 72*10^3 ; // ohm
+Iin = 50*10^-6 ; // A
+Vo = 5 ; // V 
+
+// closed loop gain
+//Av = Vo/Vin = (1+R2/R1)
+Av = 1+(R2/R1);
+// but  
+Av = 5 ;
+// then
+// (R2/R1) = 4 ;
+
+// the output voltage of the amplifier is Vo = 5 V 
+//i.e
+Vin = 1 ; // V
+// Iin = Vin/R1 ;
+R1 = Vin/Iin ;
+disp('the value of resistance R1 is  = '+string(R1)+' ohm');
+
+R2 = 4*R1 ;
+disp('the value of resistance R2 is  = '+string(R2)+' ohm');
+
+// the output current I2 is given as
+I2 = (Vo-Vin)/R2 ;
+disp('the output current I2 is  = '+string(I2)+' A');