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+//Tested on Windows 7 Ultimate 32-bit

+//Chapter 14 Operational Amplifiers Pg no. 431 and 432

+clear;

+clc;

+

+//Given

+

+A=175000;//open loop voltage gain

+Zin=1.5D6;//input impedance in ohms

+Zout=70;//output impedance in ohms

+Ri=8.2D3;//resistance Ri in ohms

+Rf=180D3;//feedback resistance in ohms

+

+//Solution

+

+X=Ri/(Ri+Rf);//voltage divider ratio

+Zin_n=Zin*(1+A*X);//input impedance in ohms

+Zout_n=Zout/(1+A*X);//output impedance in ohms

+Av_cl=1/X;//closed loop voltage gain

+printf("Input impedance Zin = %.f Mega-ohms\n ",Zin_n/10^6);

+printf("Output impedance Zout = %.4f ohms\n ",Zout_n);

+printf("Closed loop voltage gain (Av)cl = %.f",Av_cl);