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+// Example 3.21: (a) Transfer characteristics and output

+//               (b) Transfer characteristics and output

+clc, clear

+Vy=0.6; // in volts

+Rf=100; // in ohms

+t=[-40:0.001:40];

+vin=40*sin(2*%pi*t/80); // Input voltage in volts

+

+// Part (a)

+// From Fig. 3.49(a)

+// Sketching of transfer characteristics

+for i=1:length(vin)

+    if vin(i)<5.6 then

+        vo(i)=vin(i); // in volts

+    else

+        ID=(vin(i)-5.6)/(4.9e3+Rf); // in amperes

+        vo(i)=vin(i)-ID*4.9e3; // in volts

+    end

+end

+plot(vin,vo);

+xtitle("Part (a) - Transfer characteristics","vin","vo");

+// Sketching of output

+scf(1);

+plot(t,vin,"--");

+plot(t,vo);

+xtitle("Part (a) - Output voltage and input voltage","ωt","vo,vin");

+legend("vin","vo");

+

+// Part (b)

+// From Fig. 3.49(b)

+// Sketching of transfer characteristics

+for i=1:length(vin)

+    if vin(i)>-0.6 then

+        vo(i)=vin(i); // in volts

+    else

+        ID=(vin(i)+0.6)/(9.9e3+Rf); // in amperes

+        vo(i)=vin(i)-ID*9.9e3; // in volts

+    end

+end

+scf(2);

+plot(vin,vo);

+xtitle("Part (b) - Transfer characteristics","vin","vo");

+// Sketching of output

+scf(3);

+plot(t,vin,"--");

+plot(t,vo);

+xtitle("Part (b) - Output voltage and input voltage","ωt","vo,vin");

+legend("vin","vo");
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