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+//Example6.1  // design an inverting amplifier with a closed loop voltage gain of Av = -5

+clc;

+clear;

+close;

+Av = -5 ;

+Is = 5*10^-6 ; // A

+Rs = 1*10^3 ; // ohm

+// input voltage source Vs = sinwt volts

+

+// in an inverting amplifier frequency effect is neglected then i/p volt Vin = 1 V and total resistance equal to Rs+R1

+

+// the input current can be written as Iin=Is

+// Is = (Vin/Rs+R1);

+Iin = Is;

+Vin = 1 ; // V

+R1 = (1-(Iin*Rs))/Iin  ;

+disp('the value of resistance R1 is = '+string(R1)+' ohm');

+

+// closed loop voltage gain of an inverting amplifier

+//Av = -(R2/Rs+R1)

+R2 = -(Av*(Rs+R1));

+disp('the value of resistance R2 is  = '+string(R2)+' ohm');