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+//chapter 1
+// example 1.11
+// page 35
+Rin=1000;Rc=1000;Re=2500000;// resistance is in ohm(given)
+Hfe=50;Hre=0;Hoe=0;Hie=1000;//given
+Vid=1*10^-3;Vc=20*10^-3// voltage in volts
+Aid=-(Hfe*Rc)/(Rin+Hie);// differential gain Aid
+Vout=Aid*Vid;// output voltage
+disp(Vout)//result in ampere.
+// to calculate CMRR we have to first find Acm common mode gain
+Acm=((2*Re*Hoe-Hfe)*Rc)/(2*Re*(1+Hfe)+Rin+Hie)// common mode gain
+CMRR=Aid/Acm;//CMRR
+disp(CMRR)//result
+CMRRdb=20*log10(CMRR);
+disp(CMRRdb)// result CMRR is in db
+\ No newline at end of file