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+//chapter 3
+// example 3.3
+//page 112
+A=2*10^5;//open loop gain
+Rin=2*10^6;// input resistnace
+Ro=75;// output resistance
+Fo=5;// single break frequency in herzt
+R1=470;Rf=4700;
+K=Rf/(Rf+R1)
+B=R1/(R1+Rf)
+Af=-(A*Rf)/(R1+Rf+R1*A);//close loop gain
+Rinf=R1+(Rf*Rin)/(Rf+Rin+A*Rin);
+disp(Rinf)//close loop resistance
+Rof=Ro/(1+A*B);//close loop output resistance
+disp(Rof)//output resistance
+Ff=Fo*(1+A*B);
+disp(Ff)//bandwidth with feedback
+\ No newline at end of file