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+// Exa 4.9
+format('v',4);
+clc;
+clear;
+close;
+// Given data 
+Beta= 100;
+
+// Part (a)
+RE= 150;// in Ω
+VT= 25;// in mV
+VT= VT*10^-3;// in V
+IE= 0.5;// in mA
+IE=IE*10^-3;// in A
+re1= VT/IE;//in Ω
+R_id= 2*(Beta+1)*(re1+RE);// in Ω
+R_id= round(R_id*10^-3);// in kΩ
+disp(R_id,"The input differential resistance in kΩ is :")
+
+// Part (b)
+RC=10;//in kΩ
+RC=RC*10^3;//in Ω
+Rsig= 5+5;// in kΩ
+VoltageGain1= R_id/(Rsig+R_id);//voltage gain from the signal source to the base of Q1 and Q2 in V/V
+VoltageGain2= 2*RC/(2*(re1+RE));// voltage gain from the bases to the output in V/V
+Ad= VoltageGain1*VoltageGain2;//in V/V
+disp(Ad,"The overall differential voltage gain in V/V is ");
+
+// Part (c)
+format('e',9)
+delta_RC= 0.02*RC;
+R_EE= 200;//in kΩ
+R_EE=R_EE*10^3;//in Ω
+Acm= RC/(2*R_EE)*delta_RC/RC;//in V/V
+disp(Acm,"Common mode gain in V/V is :")
+
+// Part (d)
+format('v',4);
+CMRRindB= 20*log10(Ad/Acm);// in dB
+disp(CMRRindB,"CMRR in dB is : ")
+
+// Part (e)
+V_A= 100;// in V
+r_o= V_A/(IE);// in Ω
+// Ricm= (Beta+1)*(R_EE || r_o/2)
+Ricm= (Beta+1)*(R_EE*(r_o/2)/(R_EE+(r_o/2)));
+disp(Ricm*10^-6,"Input common mode resistance in MΩ is : ")
+
+