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+// Example 11.15: Small signal gain, Input resistance, Output resistance

+clc, clear

+btao=100;

+r_pi=1e3; // in ohms

+ICQ=2.5e-3; // in amperes

+VT=25e-3; // in volts

+gm=ICQ/VT; // Transconductance in mho

+r_pi=btao/gm; // Incremental resistance of emitter-base diode in ohms

+// From ac model without feedback in Fig. 11.47

+RS=10e3; // in ohms

+RF=47e3; // in ohms

+RC=4.7e3; // in ohms

+function[c]=parallel(a,b)

+    c=a*b/(a+b);

+endfunction

+AoL=-gm*parallel(RF,RC)*parallel(RS,parallel(RF,r_pi)); // in ohms

+bta=1/RF;

+T=-bta*AoL;  // Return ratio

+AF=AoL/(1+T); // in ohms

+AVF=AF/RS; // Small signal gain

+RID=parallel(RF,r_pi); // in ohms

+RID_dash=parallel(RID,RS); // in ohms

+RIF_dash_I=RID_dash/(1+T); // in ohms

+RIF_I=RS*RIF_dash_I/(RS-RIF_dash_I); // in ohms

+RIF_dash_V=RS+RIF_I; // in ohms

+RoD_dash=parallel(RF,RC); // in ohms

+RoF_dash=RoD_dash/(1+T); // in ohms

+RoF=RoF_dash*RC/(RC-RoF_dash); // in ohms

+disp(RoF);

+RIF_dash_V=RIF_dash_V*1e-3; // in kilo-ohms

+RoF=RoF*1e-3; // in kilo-ohms

+disp(AVF,"Small signal gain =");

+disp(RIF_dash_V,"Input resistance (kΩ​) =");

+disp(RoF,"Output resistance (kΩ​) =");
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