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+// Exa 2.9
+
+clc;
+clear;
+
+// Given data
+
+// A differential amplifier with single ended output
+// Referring circuit given in Fig. 2.9
+Bo = 100; // current gain
+Re = 150; // Ω
+Rc = 10*10^3; // Ω
+IQ = 0.5*10^-3; // mA
+VT = 25*10^-3; // mV
+
+// Solution
+
+ICQ = IQ/2;
+gm = ICQ/VT;  // in ʊ
+r_pi = Bo/gm;
+
+printf(' The differential mode gain for a single stage is found from the equivalent circuit shown in fig.(ii)\n  on page no. 64 and is equal to ');
+ADM = (1/2)*(Bo*Rc/(r_pi+(1+Bo)*Re));
+printf(' %d V/V. \n',round(ADM));
+printf(' \n  We can see that sign of ADM is positive because the output is taken at the collector of Q2\n  whereas input is applied at the base of Q1. \n');